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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2022
Income Taxes |
Schedule of components of provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(dollars in thousands) |  | 2022 |  | 2021 |  | 2020
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 50,895 | ​ | $ | 53,534 | ​ | $ | 55,535
State and local | ​ | ​ | 12,493 | ​ | ​ | 15,607 | ​ | ​ | 21,831
Total current | ​ | ​ | 63,388 | ​ | ​ | 69,141 | ​ | ​ | 77,366
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | ​ | 13,639 | ​ | ​ | 8,837 | ​ | ​ | (10,638)
State and local | ​ | ​ | 8,499 | ​ | ​ | 5,283 | ​ | ​ | (8,758)
Total deferred | ​ | ​ | 22,138 | ​ | ​ | 14,120 | ​ | ​ | (19,396)
Total provision for income taxes | ​ | $ | 85,526 | ​ | $ | 83,261 | ​ | $ | 57,970
​
Schedule of components of net deferred income tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(dollars in thousands) |  | 2022 |  | 2021
Assets: | ​ | ​ | ​ | ​ | ​ | ​
Deferred compensation expense | ​ | $ | 51,064 | ​ | $ | 58,497
Allowance for credit losses and nonperforming assets | ​ | ​ | 47,517 | ​ | ​ | 50,161
Lease liabilities | ​ | ​ | 17,284 | ​ | ​ | 17,534
Investment securities | ​ | ​ | 233,859 | ​ | ​ | 40,108
State income taxes | ​ | ​ | 2,619 | ​ | ​ | 3,440
Total deferred income tax assets before valuation allowance | ​ | ​ | 352,343 | ​ | ​ | 169,740
Valuation allowance | ​ | ​ | (983) | ​ | ​ | (1,082)
Total deferred income tax assets after valuation allowance | ​ | ​ | 351,360 | ​ | ​ | 168,658
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Leases | ​ | ​ | (15,739) | ​ | ​ | (15,785)
Deferred income | ​ | ​ | (20,893) | ​ | ​ | (14,213)
Lease right-of-use assets | ​ | ​ | (16,763) | ​ | ​ | (17,132)
Intangible assets | ​ | ​ | (736) | ​ | ​ | (577)
Other | ​ | ​ | (34,910) | ​ | ​ | (24,779)
Total deferred income tax liabilities | ​ | ​ | (89,041) | ​ | ​ | (72,486)
Net deferred income tax assets | ​ | $ | 262,319 | ​ | $ | 96,172
​
Schedule of reconciliation of Federal statutory to effective income tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ | ​ | 2022 | ​ | ​ | 2021 | ​ | ​ | 2020 | ​
(dollars in thousands) |  | Amount |  | Percent | ​ | ​ | Amount |  | Percent | ​ | ​ | Amount |  | Percent | ​
Federal statutory income tax expense and rate | ​ | $ | 73,754 | ​ | 21.00 | % | ​ | $ | 73,289 | ​ | 21.00 | % | ​ | $ | 51,182 | ​ | 21.00 | %
State and local taxes, net of federal income tax benefit | ​ | ​ | 16,584 | ​ | 4.72 | ​ | ​ | ​ | 16,503 | ​ | 4.73 | ​ | ​ | ​ | 10,327 | ​ | 4.24 | ​
Tax credits | ​ | ​ | (3,963) | ​ | (1.13) | ​ | ​ | ​ | (2,745) | ​ | (0.79) | ​ | ​ | ​ | (3,914) | ​ | (1.60) | ​
Nontaxable income | ​ | ​ | (1,133) | ​ | (0.32) | ​ | ​ | ​ | (3,274) | ​ | (0.94) | ​ | ​ | ​ | (3,678) | ​ | (1.51) | ​
Other | ​ | ​ | 284 | ​ | 0.08 | ​ | ​ | ​ | (512) | ​ | (0.14) | ​ | ​ | ​ | 4,053 | ​ | 1.66 | ​
Income tax expense and effective income tax rate | ​ | $ | 85,526 | ​ | 24.35 | % | ​ | $ | 83,261 | ​ | 23.86 | % | ​ | $ | 57,970 | ​ | 23.79 | %
​
Schedule of reconciliation of unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 | ​ | 2021 | ​ | 2020
​ | ​ | ​ | ​ | ​ | Interest | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Interest | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Interest | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | and | ​ | ​ | ​ | ​ | ​ | ​ | ​ | and | ​ | ​ | ​ | ​ | ​ | ​ | ​ | and | ​ | ​ | ​
(dollars in thousands) |  | Tax |  | Penalties |  | Total |  | Tax |  | Penalties |  | Total |  | Tax |  | Penalties |  | Total
Balance at beginning of year | ​ | $ | 183,311 | ​ | $ | 20,743 | ​ | $ | 204,054 | ​ | $ | 135,595 | ​ | $ | 18,926 | ​ | $ | 154,521 | ​ | $ | 134,312 | ​ | $ | 14,701 | ​ | $ | 149,013
Additions for current year tax positions | ​ | ​ | 1,289 | ​ | ​ | — | ​ | ​ | 1,289 | ​ | ​ | 1,366 | ​ | ​ | — | ​ | ​ | 1,366 | ​ | ​ | 1,426 | ​ | ​ | — | ​ | ​ | 1,426
Additions for Reorganization Transactions | ​ | ​ | — | ​ | ​ | 974 | ​ | ​ | 974 | ​ | ​ | 47,282 | ​ | ​ | 941 | ​ | ​ | 48,223 | ​ | ​ | — | ​ | ​ | 1,479 | ​ | ​ | 1,479
Additions for prior years' tax positions: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accrual of interest and penalties | ​ | ​ | — | ​ | ​ | 860 | ​ | ​ | 860 | ​ | ​ | — | ​ | ​ | 1,264 | ​ | ​ | 1,264 | ​ | ​ | — | ​ | ​ | 2,812 | ​ | ​ | 2,812
Reductions for prior years' tax positions: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expiration of statute of limitations | ​ | ​ | (849) | ​ | ​ | (103) | ​ | ​ | (952) | ​ | ​ | (932) | ​ | ​ | (388) | ​ | ​ | (1,320) | ​ | ​ | (143) | ​ | ​ | (66) | ​ | ​ | (209)
Balance at December 31, | ​ | $ | 183,751 | ​ | $ | 22,474 | ​ | $ | 206,225 | ​ | $ | 183,311 | ​ | $ | 20,743 | ​ | $ | 204,054 | ​ | $ | 135,595 | ​ | $ | 18,926 | ​ | $ | 154,521
​

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