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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2024
Income Taxes |
Schedule of components of provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(dollars in thousands) |  | 2024 |  | 2023 |  | 2022
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 57,006 | ​ | $ | 66,123 | ​ | $ | 50,895
State and local | ​ | ​ | 16,754 | ​ | ​ | 21,724 | ​ | ​ | 12,493
Total current | ​ | ​ | 73,760 | ​ | ​ | 87,847 | ​ | ​ | 63,388
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | ​ | (4,756) | ​ | ​ | (8,387) | ​ | ​ | 13,639
State and local | ​ | ​ | (6,531) | ​ | ​ | (5,269) | ​ | ​ | 8,499
Total deferred | ​ | ​ | (11,287) | ​ | ​ | (13,656) | ​ | ​ | 22,138
Total provision for income taxes | ​ | $ | 62,473 | ​ | $ | 74,191 | ​ | $ | 85,526
Schedule of components of net deferred income tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(dollars in thousands) |  | 2024 |  | 2023
Assets: | ​ | ​ | ​ | ​ | ​ | ​
Deferred compensation expense | ​ | $ | 52,192 | ​ | $ | 50,945
Allowance for credit losses and nonperforming assets | ​ | ​ | 51,922 | ​ | ​ | 51,492
Lease liabilities | ​ | ​ | 16,808 | ​ | ​ | 17,027
Investment securities | ​ | ​ | 171,258 | ​ | ​ | 194,213
State income taxes | ​ | ​ | 1,939 | ​ | ​ | 2,514
Total deferred income tax assets | ​ | ​ | 294,119 | ​ | ​ | 316,191
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Leases | ​ | ​ | (8,457) | ​ | ​ | (13,283)
Deferred income | ​ | ​ | (7,151) | ​ | ​ | (12,751)
Lease right-of-use assets | ​ | ​ | (16,041) | ​ | ​ | (16,364)
Intangible assets | ​ | ​ | (973) | ​ | ​ | (948)
Other | ​ | ​ | (30,292) | ​ | ​ | (33,320)
Total deferred income tax liabilities | ​ | ​ | (62,914) | ​ | ​ | (76,666)
Net deferred income tax assets | ​ | $ | 231,205 | ​ | $ | 239,525
Schedule of reconciliation of Federal statutory to effective income tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ | ​ | 2024 | ​ | ​ | 2023 | ​ | ​ | 2022 | ​
(dollars in thousands) |  | Amount |  | Percent | ​ | ​ | Amount |  | Percent | ​ | ​ | Amount |  | Percent | ​
Federal statutory income tax expense and rate | ​ | $ | 61,446 | ​ | 21.00 | % | ​ | $ | 64,927 | ​ | 21.00 | % | ​ | $ | 73,754 | ​ | 21.00 | %
State and local taxes, net of federal income tax benefit | ​ | ​ | 8,077 | ​ | 2.76 | ​ | ​ | ​ | 13,000 | ​ | 4.20 | ​ | ​ | ​ | 16,584 | ​ | 4.72 | ​
Tax credits | ​ | ​ | (4,388) | ​ | (1.50) | ​ | ​ | ​ | (4,506) | ​ | (1.46) | ​ | ​ | ​ | (3,963) | ​ | (1.13) | ​
Nontaxable income | ​ | ​ | (5,604) | ​ | (1.92) | ​ | ​ | ​ | (6,691) | ​ | (2.16) | ​ | ​ | ​ | (1,133) | ​ | (0.32) | ​
Other | ​ | ​ | 2,942 | ​ | 1.01 | ​ | ​ | ​ | 7,461 | ​ | 2.42 | ​ | ​ | ​ | 284 | ​ | 0.08 | ​
Income tax expense and effective income tax rate | ​ | $ | 62,473 | ​ | 21.35 | % | ​ | $ | 74,191 | ​ | 24.00 | % | ​ | $ | 85,526 | ​ | 24.35 | %
Schedule of reconciliation of unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2024 | ​ | 2023 | ​ | 2022
​ | ​ | ​ | ​ | ​ | Interest | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Interest | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Interest | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | and | ​ | ​ | ​ | ​ | ​ | ​ | ​ | and | ​ | ​ | ​ | ​ | ​ | ​ | ​ | and | ​ | ​ | ​
(dollars in thousands) |  | Tax |  | Penalties |  | Total |  | Tax |  | Penalties |  | Total |  | Tax |  | Penalties |  | Total
Balance at beginning of year | ​ | $ | 185,461 | ​ | $ | 26,584 | ​ | $ | 212,045 | ​ | $ | 183,751 | ​ | $ | 22,474 | ​ | $ | 206,225 | ​ | $ | 183,311 | ​ | $ | 20,743 | ​ | $ | 204,054
Additions for current year tax positions | ​ | ​ | 653 | ​ | ​ | — | ​ | ​ | 653 | ​ | ​ | 629 | ​ | ​ | — | ​ | ​ | 629 | ​ | ​ | 1,289 | ​ | ​ | — | ​ | ​ | 1,289
Additions for Reorganization Transactions | ​ | ​ | — | ​ | ​ | 2,717 | ​ | ​ | 2,717 | ​ | ​ | — | ​ | ​ | 3,155 | ​ | ​ | 3,155 | ​ | ​ | — | ​ | ​ | 974 | ​ | ​ | 974
Additions for prior years' tax positions: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
New uncertain tax positions identified | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,220 | ​ | ​ | — | ​ | ​ | 2,220 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Accrual of interest and penalties | ​ | ​ | — | ​ | ​ | 1,253 | ​ | ​ | 1,253 | ​ | ​ | — | ​ | ​ | 1,221 | ​ | ​ | 1,221 | ​ | ​ | — | ​ | ​ | 860 | ​ | ​ | 860
Reductions for prior years' tax positions: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expiration of statute of limitations | ​ | ​ | (4,408) | ​ | ​ | (1,280) | ​ | ​ | (5,688) | ​ | ​ | (1,139) | ​ | ​ | (266) | ​ | ​ | (1,405) | ​ | ​ | (849) | ​ | ​ | (103) | ​ | ​ | (952)
Resolutions with tax authorities | ​ | ​ | (2,698) | ​ | ​ | (1,890) | ​ | ​ | (4,588) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Balance at December 31, | ​ | $ | 179,008 | ​ | $ | 27,384 | ​ | $ | 206,392 | ​ | $ | 185,461 | ​ | $ | 26,584 | ​ | $ | 212,045 | ​ | $ | 183,751 | ​ | $ | 22,474 | ​ | $ | 206,225

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