| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Interest Income | | | | | | | | |
| Loans | 764.0 | 748.0 | 713.0 | 595.0 | 446.0 | 348.0 | 295.0 | 246.0 |
| Investment securities | 46.0 | 70.0 | 77.0 | 86.0 | 80.0 | 68.0 | 59.0 | 39.0 |
| Total interest income | 810.0 | 819.0 | 794.0 | 683.0 | 527.0 | 417.0 | 355.0 | 286.0 |
| |
| Interest Expense | | | | | | | | |
| Deposits | 32.0 | 81.0 | 138.0 | 94.0 | 52.0 | 46.0 | 42.0 | 30.0 |
| Short-term Federal Home Loan Bank advances and other | 4.0 | 16.0 | 59.0 | 68.0 | 36.0 | 5.0 | 1.0 | |
| Long-term Federal Home Loan Bank advances | 13.0 | 12.0 | 7.0 | -4.0 | | | 18.0 | 2.0 |
| Other long-term debt | 14.0 | 25.0 | 28.0 | 28.0 | 25.0 | 16.0 | 7.0 | 7.0 |
| Total interest expense | 63.0 | 134.0 | 232.0 | 186.0 | 137.0 | 94.0 | 68.0 | 39.0 |
| Net interest income | 747.0 | 685.0 | 562.0 | 497.0 | 390.0 | 323.0 | 287.0 | 247.0 |
| Provision (benefit) for credit losses | -112.0 | 149.0 | 18.0 | -8.0 | 6.0 | -8.0 | -19.0 | 132.0 |
| Net interest income after benefit for credit losses | 859.0 | 536.0 | 544.0 | 505.0 | 384.0 | 331.0 | 306.0 | 115.0 |
| |
| Noninterest Income | | | | | | | | |
| Net gain on loan sales | 655.0 | 971.0 | 335.0 | 200.0 | 268.0 | 316.0 | 288.0 | 206.0 |
| Loan fees and charges | 141.0 | 150.0 | 100.0 | 87.0 | 82.0 | 76.0 | | |
| Loan administration income | 121.0 | 84.0 | 30.0 | 23.0 | 21.0 | 18.0 | 26.0 | 24.0 |
| Other noninterest income | 70.0 | 63.0 | 101.0 | 72.0 | 59.0 | 81.0 | 17.0 | 21.0 |
| Total noninterest income | 1,044.0 | 1,310.0 | 610.0 | 439.0 | 470.0 | 487.0 | 1,013.0 | 372.0 |
| |
| Noninterest Expense | | | | | | | | |
| Compensation and benefits | 533.0 | 466.0 | 377.0 | 318.0 | 299.0 | 269.0 | 237.0 | 233.0 |
| Occupancy and equipment | 188.0 | 176.0 | 161.0 | 127.0 | 103.0 | 85.0 | 81.0 | 80.0 |
| Commissions | 194.0 | 232.0 | 111.0 | 80.0 | 72.0 | 55.0 | 39.0 | 35.0 |
| Loan processing expense | 86.0 | 83.0 | 80.0 | 59.0 | 57.0 | 55.0 | 52.0 | 37.0 |
| Legal and professional expense | 45.0 | 31.0 | 27.0 | 28.0 | 30.0 | 29.0 | 36.0 | 51.0 |
| Federal insurance premiums | 20.0 | 24.0 | 20.0 | 22.0 | 16.0 | 11.0 | | 23.0 |
| General, administrative and other | 181.0 | 148.0 | 124.0 | 101.0 | 96.0 | 85.0 | 127.0 | 125.0 |
| Total noninterest expense | 1,213.0 | 1,142.0 | 888.0 | 712.0 | 643.0 | 560.0 | 536.0 | 590.0 |
| Provision for income taxes | 157.0 | 166.0 | 48.0 | 45.0 | 148.0 | 87.0 | 82.0 | -34.0 |
| Net income | 533.0 | 538.0 | 218.0 | 187.0 | 63.0 | 171.0 | 158.0 | -69.0 |
| |
| Net income per share | | | | | | | | |
| Basic (in dollars per share) | $10.10 | $9.59 | $3.85 | $3.26 | $1.11 | $2.71 | $2.27 | ($1.72) |
| Diluted (in dollars per share) | $9.96 | $9.52 | $3.80 | $3.21 | $1.09 | $2.66 | $2.24 | ($1.72) |
| |
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| Weighted average shares outstanding | | | | | | | | |
| Basic (in shares) | 52.8 | 56.1 | 56.6 | 57.5 | 57.1 | 56.6 | 56.4 | 56.2 |
| Diluted (in shares) | 53.5 | 56.5 | 57.2 | 58.3 | 58.2 | 57.6 | 57.2 | 56.2 |