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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2022
Income Tax Disclosure [Abstract] |
Schedule of Deferred Tax Assets and Liabilities | Net deferred tax assets and liabilities consist of the following components as of December 31, 2022 and 2021 (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Deferred tax assets: |  | ​ |  |  | ​ |
Credit losses | ​ | $ | 33,714 | ​ | $ | 30,132
Benefit plans | ​ |  | 3,290 | ​ |  | 4,016
Acquisition accounting | ​ |  | 3,866 | ​ |  | 5,711
Lease right-of-use asset | ​ | ​ | 11,982 | ​ | ​ | 12,889
Stock grants | ​ |  | 2,449 | ​ |  | 2,642
Foreclosed and former bank owned property | ​ |  | 2,955 | ​ |  | 6,110
Securities available for sale | ​ |  | 97,572 | ​ |  | —
Prime loan swap | ​ | ​ | 14,517 | ​ | ​ | —
Net operating losses | ​ |  | 30,911 | ​ |  | 41,573
Nonaccrual loans | ​ |  | 589 | ​ |  | 733
Other | ​ |  | 2,845 | ​ |  | 4,760
Total deferred tax assets | ​ | $ | 204,690 | ​ | $ | 108,566
Deferred tax liabilities: | ​ |  |  | ​ |  |
Acquisition accounting | ​ | $ | 10,992 | ​ | $ | 13,252
Lease right-of-use liability | ​ | ​ | 8,846 | ​ | ​ | 10,105
Premises and equipment | ​ |  | 59,341 | ​ |  | 47,832
Securities available for sale | ​ |  | — | ​ |  | 5,157
Other | ​ |  | 1,346 | ​ |  | 1,193
Total deferred tax liabilities | ​ |  | 80,525 | ​ |  | 77,539
Net deferred tax asset | ​ | $ | 124,165 | ​ | $ | 31,027
​
Provision for Income Taxes Charged to Operations | The income tax expense for the years ended December 31, 2022, 2021, and 2020 consists of the following (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020
Current tax expense | ​ | $ | 20,389 | ​ | $ | 11,330 | ​ | $ | 25,376
Deferred tax expense | ​ |  | 25,055 | ​ |  | 43,512 | ​ |  | 2,690
Income tax expense | ​ | $ | 45,444 | ​ | $ | 54,842 | ​ | $ | 28,066
​
Schedule of Income Tax Expense, Difference in Income Tax Rate to Pretax Income | The income tax expense differs from the amount of income tax determined by applying the U.S. federal income tax rate to pre-tax income for the years ended December 31, 2022, 2021, and 2020 due to the following (dollars in thousands): ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020
Computed "expected" tax expense | ​ | $ | 58,790 | ​ | $ | 66,939 | ​ | $ | 39,122
(Decrease) in taxes resulting from: | ​ |  |  | ​ |  |  | ​ |  |
Tax-exempt interest income, net | ​ |  | (11,615) | ​ |  | (9,820) | ​ |  | (8,844)
State income tax expense(benefit) | ​ | ​ | 880 | ​ | ​ | (1,039) | ​ | ​ | (310)
Other, net | ​ |  | (2,611) | ​ |  | (1,238) | ​ |  | (1,902)
Income tax expense | ​ | $ | 45,444 | ​ | $ | 54,842 | ​ | $ | 28,066
​

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