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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Taxes |
Schedule of components of provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(dollars in thousands) |  | 2021 |  | 2020 |  | 2019
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 53,534 | ​ | $ | 55,535 | ​ | $ | 56,450
State and local | ​ | ​ | 15,607 | ​ | ​ | 21,831 | ​ | ​ | 23,796
Total current | ​ | ​ | 69,141 | ​ | ​ | 77,366 | ​ | ​ | 80,246
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | ​ | 8,837 | ​ | ​ | (10,638) | ​ | ​ | 14,047
State and local | ​ | ​ | 5,283 | ​ | ​ | (8,758) | ​ | ​ | 3,013
Total deferred | ​ | ​ | 14,120 | ​ | ​ | (19,396) | ​ | ​ | 17,060
Total provision for income taxes | ​ | $ | 83,261 | ​ | $ | 57,970 | ​ | $ | 97,306
Schedule of components of net deferred income tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(dollars in thousands) |  | 2021 |  | 2020
Assets: | ​ | ​ | ​ | ​ | ​ | ​
Deferred compensation expense | ​ | $ | 58,497 | ​ | $ | 57,727
Allowance for credit losses and nonperforming assets | ​ | ​ | 50,161 | ​ | ​ | 63,899
Lease liabilities | ​ | ​ | 17,534 | ​ | ​ | 10,839
Investment securities | ​ | ​ | 40,108 | ​ | ​ | —
State income taxes | ​ | ​ | 3,440 | ​ | ​ | 4,243
Total deferred income tax assets before valuation allowance | ​ | ​ | 169,740 | ​ | ​ | 136,708
Valuation allowance | ​ | ​ | (1,082) | ​ | ​ | (1,675)
Total deferred income tax assets after valuation allowance | ​ | ​ | 168,658 | ​ | ​ | 135,033
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Leases | ​ | ​ | (15,785) | ​ | ​ | (18,583)
Investment securities | ​ | ​ | — | ​ | ​ | (19,965)
Deferred income | ​ | ​ | (14,213) | ​ | ​ | (11,399)
Lease right-of-use assets | ​ | ​ | (17,132) | ​ | ​ | (10,736)
Intangible assets | ​ | ​ | (577) | ​ | ​ | (604)
Other | ​ | ​ | (24,779) | ​ | ​ | (19,222)
Total deferred income tax liabilities | ​ | ​ | (72,486) | ​ | ​ | (80,509)
Net deferred income tax assets | ​ | $ | 96,172 | ​ | $ | 54,524
Schedule of reconciliation of Federal statutory to effective income tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ | ​ | 2021 | ​ | ​ | 2020 | ​ | ​ | 2019 | ​
(dollars in thousands) |  | Amount |  | Percent | ​ | ​ | Amount |  | Percent | ​ | ​ | Amount |  | Percent | ​
Federal statutory income tax expense and rate | ​ | $ | 73,289 | ​ | 21.00 | % | ​ | $ | 51,182 | ​ | 21.00 | % | ​ | $ | 80,157 | ​ | 21.00 | %
State and local taxes, net of federal income tax benefit | ​ | ​ | 16,503 | ​ | 4.73 | ​ | ​ | ​ | 10,327 | ​ | 4.24 | ​ | ​ | ​ | 21,179 | ​ | 5.55 | ​
Tax credits | ​ | ​ | (2,745) | ​ | (0.79) | ​ | ​ | ​ | (3,914) | ​ | (1.60) | ​ | ​ | ​ | (400) | ​ | (0.10) | ​
Nontaxable income | ​ | ​ | (3,274) | ​ | (0.94) | ​ | ​ | ​ | (3,678) | ​ | (1.51) | ​ | ​ | ​ | (3,269) | ​ | (0.86) | ​
Other | ​ | ​ | (512) | ​ | (0.14) | ​ | ​ | ​ | 4,053 | ​ | 1.66 | ​ | ​ | ​ | (361) | ​ | (0.10) | ​
Income tax expense and effective income tax rate | ​ | $ | 83,261 | ​ | 23.86 | % | ​ | $ | 57,970 | ​ | 23.79 | % | ​ | $ | 97,306 | ​ | 25.49 | %
Schedule of reconciliation of unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2021 | ​ | 2020 | ​ | 2019
​ | ​ | ​ | ​ | ​ | Interest | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Interest | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Interest | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | and | ​ | ​ | ​ | ​ | ​ | ​ | ​ | and | ​ | ​ | ​ | ​ | ​ | ​ | ​ | and | ​ | ​ | ​
(dollars in thousands) |  | Tax |  | Penalties |  | Total |  | Tax |  | Penalties |  | Total |  | Tax |  | Penalties |  | Total
Balance at beginning of year | ​ | $ | 135,595 | ​ | $ | 18,926 | ​ | $ | 154,521 | ​ | $ | 134,312 | ​ | $ | 14,701 | ​ | $ | 149,013 | ​ | $ | 131,570 | ​ | $ | 12,524 | ​ | $ | 144,094
Additions for current year tax positions | ​ | ​ | 1,366 | ​ | ​ | — | ​ | ​ | 1,366 | ​ | ​ | 1,426 | ​ | ​ | — | ​ | ​ | 1,426 | ​ | ​ | 1,038 | ​ | ​ | — | ​ | ​ | 1,038
Additions for Reorganization Transactions | ​ | ​ | 47,282 | ​ | ​ | 941 | ​ | ​ | 48,223 | ​ | ​ | — | ​ | ​ | 1,479 | ​ | ​ | 1,479 | ​ | ​ | — | ​ | ​ | 986 | ​ | ​ | 986
Additions for prior years' tax positions: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
New uncertain tax positions identified | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,894 | ​ | ​ | — | ​ | ​ | 1,894
Accrual of interest and penalties | ​ | ​ | — | ​ | ​ | 1,264 | ​ | ​ | 1,264 | ​ | ​ | — | ​ | ​ | 2,812 | ​ | ​ | 2,812 | ​ | ​ | — | ​ | ​ | 1,280 | ​ | ​ | 1,280
Reductions for prior years' tax positions: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expiration of statute of limitations | ​ | ​ | (932) | ​ | ​ | (388) | ​ | ​ | (1,320) | ​ | ​ | (143) | ​ | ​ | (66) | ​ | ​ | (209) | ​ | ​ | (190) | ​ | ​ | (89) | ​ | ​ | (279)
Balance at December 31, | ​ | $ | 183,311 | ​ | $ | 20,743 | ​ | $ | 204,054 | ​ | $ | 135,595 | ​ | $ | 18,926 | ​ | $ | 154,521 | ​ | $ | 134,312 | ​ | $ | 14,701 | ​ | $ | 149,013

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