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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Taxes |
Schedule of provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
(Dollars in thousands) | ​ | 2023 | ​ | 2022 | ​ | 2021 |
Current: |  | ​ |  |  | ​ |  |  | ​ |  | ​
Federal | ​ | $ | 111,433 | ​ | $ | 5,940 | ​ | $ | 43,959 | ​
State | ​ |  | 23,157 | ​ |  | 7,044 | ​ |  | 16,512 | ​
Total current tax expense | ​ |  | 134,590 | ​ |  | 12,984 | ​ |  | 60,471 | ​
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ |  | 738 | ​ |  | 103,875 | ​ |  | 61,521 | ​
State | ​ |  | 1,216 | ​ |  | 20,454 | ​ |  | 6,744 | ​
Total deferred tax expense | ​ |  | 1,954 | ​ |  | 124,329 | ​ |  | 68,265 | ​
Provision for income taxes | ​ | $ | 136,544 | ​ | $ | 137,313 | ​ | $ | 128,736 | ​
Schedule of provision for income taxes and taxes computed by applying the federal statutory income tax rate to income before provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
(Dollars in thousands) | ​ | 2023 | ​ | 2022 | ​ | 2021 |
Income taxes at federal statutory rate |  | $ | 132,479 |  | $ | 133,006 |  | $ | 126,899 | ​
Increase (reduction) of taxes resulting from: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
State income taxes, net of federal tax benefit | ​ |  | 19,123 | ​ |  | 21,491 | ​ |  | 18,372 | ​
Non-deductible merger expenses | ​ | ​ | — | ​ | ​ | 415 | ​ | ​ | — | ​
Increase in cash surrender value of BOLI policies | ​ | ​ | (5,605) | ​ | ​ | (5,105) | ​ | ​ | (3,866) | ​
Tax-exempt interest | ​ |  | (7,016) | ​ |  | (7,828) | ​ |  | (5,450) | ​
Income tax credits | ​ |  | (14,253) | ​ |  | (13,667) | ​ |  | (11,759) | ​
Non-deductible FDIC premiums | ​ | ​ | 5,330 | ​ | ​ | 3,287 | ​ | ​ | 2,380 | ​
Non-deductible executive compensation | ​ | ​ | 4,745 | ​ | ​ | 4,319 | ​ | ​ | 530 | ​
Other, net | ​ |  | 1,741 | ​ |  | 1,395 | ​ |  | 1,630 | ​
​ | ​ | $ | 136,544 | ​ | $ | 137,313 | ​ | $ | 128,736 | ​
Schedule of components of the net deferred tax asset | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
(Dollars in thousands) | ​ | 2023 | ​ | 2022 |
Allowance for credit losses |  | $ | 123,496 |  | $ | 101,416 | ​
Share-based compensation | ​ |  | 10,425 | ​ |  | 10,509 | ​
Pension plan and post-retirement benefits | ​ |  | 371 | ​ |  | 1,157 | ​
Deferred compensation | ​ |  | 14,039 | ​ |  | 14,583 | ​
Purchase accounting adjustments | ​ |  | 1,439 | ​ |  | 1,484 | ​
Capitalized research and development costs | ​ | ​ | 4,524 | ​ | ​ | — | ​
Accrued expenses | ​ | ​ | 14,470 | ​ | ​ | 6,953 | ​
Other real estate owned | ​ |  | — | ​ |  | 877 | ​
FDIC special assessment | ​ | ​ | 6,168 | ​ | ​ | — | ​
Net operating loss and tax credit carryforwards | ​ |  | 20,263 | ​ |  | 27,271 | ​
Nonaccrual Interest | ​ | ​ | 1,773 | ​ | ​ | 566 | ​
Lease liability | ​ | ​ | 26,076 | ​ | ​ | 27,675 | ​
Unrealized losses on investment securities available for sale | ​ | ​ | 142,543 | ​ | ​ | 215,013 | ​
Other | ​ |  | 2,201 | ​ |  | 1,277 | ​
Total deferred tax assets | ​ |  | 367,788 | ​ |  | 408,781 | ​
Depreciation | ​ |  | 10,439 | ​ |  | 22,442 | ​
Intangible assets | ​ |  | 17,764 | ​ |  | 23,558 | ​
Net deferred loan costs | ​ |  | 16,468 | ​ |  | 10,431 | ​
Right of use assets | ​ | ​ | 24,161 | ​ | ​ | 25,848 | ​
Prepaid expense | ​ |  | 809 | ​ |  | 836 | ​
Mark to market liabilities | ​ | ​ | 92,505 | ​ | ​ | 110,122 | ​
Tax deductible goodwill | ​ |  | 12,398 | ​ |  | 9,090 | ​
Mortgage servicing rights | ​ | ​ | 20,863 | ​ | ​ | 21,371 | ​
Other real estate owned | ​ | ​ | 192 | ​ | ​ | — | ​
Other | ​ |  | 3,950 | ​ |  | 1,776 | ​
Total deferred tax liabilities | ​ |  | 199,549 | ​ |  | 225,474 | ​
Net deferred tax assets before valuation allowance | ​ |  | 168,239 | ​ |  | 183,307 | ​
Less, valuation allowance | ​ |  | (3,885) | ​ |  | (5,506) | ​
Net deferred tax assets | ​ | $ | 164,354 | ​ | $ | 177,801 | ​
Schedule of reconciliation of the beginning balance and ending amount of unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
(Dollars in thousands) | ​ | 2023 |
Balance at beginning of year |  | $ | — | ​
Increases related to prior year tax positions | ​ |  | 12,352 | ​
Increases related to current year tax positions | ​ | ​ | 693 | ​
Balance at end of year | ​ | $ | 13,045 | ​

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