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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table presents the balances of financial assets and liabilities measured at fair value on a recurring basis as of December 31, (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 Fair Value Measurements using
​ |  | ​ | ​ |  | Significant |  | ​ | ​ |  | ​ | ​
​ | ​ | Quoted Prices in | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | Active Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
​ | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Balance
ASSETS | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
AFS securities: | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. government and agency securities | ​ | $ | 61,311 | ​ | $ | 2,045 | ​ | $ | — | ​ | $ | 63,356
Obligations of states and political subdivisions | ​ |  | — | ​ |  | 475,447 | ​ |  | — | ​ |  | 475,447
Corporate and other bonds(1) | ​ |  | — | ​ |  | 241,889 | ​ |  | — | ​ |  | 241,889
MBS | ​ |  | — | ​ |  | 1,448,817 | ​ |  | — | ​ |  | 1,448,817
Other securities | ​ |  | — | ​ |  | 1,752 | ​ |  | — | ​ |  | 1,752
LHFS | ​ |  | — | ​ |  | 6,710 | ​ |  | — | ​ |  | 6,710
Financial Derivatives(2) | ​ |  | — | ​ |  | 93,027 | ​ |  | — | ​ |  | 93,027
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Financial Derivatives(2) | ​ | $ | — | ​ | $ | 206,561 | ​ | $ | — | ​ | $ | 206,561
(1) Other bonds include asset-backed securities. (2) Includes hedged and non-hedged derivatives. ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 Fair Value Measurements using
​ |  | ​ | ​ |  | Significant |  | ​ | ​ |  | ​ | ​
​ | ​ | Quoted Prices in | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | Active Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
​ | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Balance
ASSETS | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
AFS securities: | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. government and agency securities | ​ | $ | 56,606 | ​ | $ | 5,337 | ​ | $ | — | ​ | $ | 61,943
Obligations of states and political subdivisions | ​ | ​ | — | ​ | ​ | 807,435 | ​ | ​ | — | ​ | ​ | 807,435
Corporate and other bonds(1) | ​ |  | — | ​ |  | 226,380 | ​ |  | — | ​ |  | 226,380
MBS | ​ |  | — | ​ |  | 1,644,394 | ​ |  | — | ​ |  | 1,644,394
Other securities | ​ |  | — | ​ |  | 1,664 | ​ |  | — | ​ |  | 1,664
LHFS | ​ | ​ | — | ​ | ​ | 3,936 | ​ | ​ | — | ​ | ​ | 3,936
Financial Derivatives(2) | ​ |  | — | ​ |  | 80,310 | ​ |  | — | ​ |  | 80,310
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Financial Derivatives(2) | ​ | $ | — | ​ | $ | 236,000 | ​ | $ | — | ​ | $ | 236,000
(1) Other bonds include asset-backed securities. (2) Includes hedged and non-hedged derivatives. ​
Carrying Values and Estimated Fair Values of the Company's Financial Instruments | The carrying values and estimated fair values of the Company’s financial instruments as of December 31, are as follows (dollars in thousands): ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 Fair Value Measurements using
​ |  | ​ | ​ |  | Quoted Prices |  | Significant |  | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | in Active | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Markets for | ​ | Observable | ​ | Unobservable | ​ | Total Fair
​ | ​ | ​ | ​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | Value
​ | ​ | Carrying | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Value | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Balance
ASSETS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents | ​ | $ | 378,131 | ​ | $ | 378,131 | ​ | $ | — | ​ | $ | — | ​ | $ | 378,131
AFS securities | ​ |  | 2,231,261 | ​ |  | 61,311 | ​ |  | 2,169,950 | ​ |  | — | ​ |  | 2,231,261
HTM securities | ​ |  | 837,378 | ​ |  | — | ​ |  | 806,834 | ​ |  | 1,240 | ​ |  | 808,074
Restricted stock | ​ |  | 115,472 | ​ |  | — | ​ |  | 115,472 | ​ |  | — | ​ |  | 115,472
LHFS | ​ |  | 6,710 | ​ |  | — | ​ |  | 6,710 | ​ |  | — | ​ |  | 6,710
LHFI, net of deferred fees and costs | ​ |  | 15,635,043 | ​ |  | — | ​ |  | — | ​ |  | 15,148,256 | ​ |  | 15,148,256
Financial Derivatives(1) | ​ |  | 93,027 | ​ |  | — | ​ |  | 93,027 | ​ |  | — | ​ |  | 93,027
Accrued interest receivable | ​ |  | 91,370 | ​ |  | — | ​ |  | 91,370 | ​ |  | — | ​ |  | 91,370
BOLI | ​ |  | 452,565 | ​ |  | — | ​ |  | 452,565 | ​ |  | — | ​ |  | 452,565
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Deposits | ​ | $ | 16,818,129 | ​ | $ | — | ​ | $ | 16,799,791 | ​ | $ | — | ​ | $ | 16,799,791
Borrowings | ​ |  | 1,311,858 | ​ |  | — | ​ |  | 1,154,694 | ​ |  | — | ​ |  | 1,154,694
Accrued interest payable | ​ |  | 20,528 | ​ |  | — | ​ |  | 20,528 | ​ |  | — | ​ |  | 20,528
Financial Derivatives(1) | ​ |  | 206,561 | ​ |  | — | ​ |  | 206,561 | ​ |  | — | ​ |  | 206,561
(1) Includes hedged and non-hedged derivatives. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 Fair Value Measurements using
​ | ​ | ​ | ​ | ​ | Quoted Prices | ​ | Significant | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | in Active | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Markets for | ​ | Observable | ​ | Unobservable | ​ | Total Fair
​ | ​ | ​ | ​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | Value
​ | ​ | Carrying | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Value | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Balance
ASSETS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents | ​ | $ | 319,948 | ​ | $ | 319,948 | ​ | $ | — | ​ | $ | — | ​ | $ | 319,948
AFS securities | ​ |  | 2,741,816 | ​ |  | 56,606 | ​ |  | 2,685,210 | ​ |  | — | ​ |  | 2,741,816
HTM securities | ​ |  | 847,732 | ​ |  | — | ​ |  | 798,778 | ​ |  | 3,109 | ​ |  | 801,887
Restricted stock | ​ |  | 120,213 | ​ |  | — | ​ |  | 120,213 | ​ |  | — | ​ |  | 120,213
LHFS | ​ | ​ | 3,936 | ​ | ​ | — | ​ |  | 3,936 | ​ |  | — | ​ | ​ | 3,936
LHFI, net of deferred fees and costs | ​ |  | 14,449,142 | ​ |  | — | ​ |  | — | ​ |  | 13,974,926 | ​ |  | 13,974,926
Financial Derivatives(1) | ​ |  | 80,310 | ​ |  | — | ​ |  | 80,310 | ​ |  | — | ​ |  | 80,310
Accrued interest receivable | ​ |  | 81,953 | ​ |  | — | ​ |  | 81,953 | ​ |  | — | ​ |  | 81,953
BOLI | ​ |  | 440,656 | ​ |  | — | ​ |  | 440,656 | ​ |  | — | ​ |  | 440,656
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Deposits | ​ | $ | 15,931,677 | ​ | $ | — | ​ | $ | 15,927,361 | ​ | $ | — | ​ | $ | 15,927,361
Borrowings | ​ |  | 1,708,700 | ​ |  | — | ​ |  | 1,645,095 | ​ |  | — | ​ |  | 1,645,095
Accrued interest payable | ​ |  | 5,268 | ​ |  | — | ​ |  | 5,268 | ​ |  | — | ​ |  | 5,268
Financial Derivatives(1) | ​ |  | 236,000 | ​ |  | — | ​ |  | 236,000 | ​ |  | — | ​ |  | 236,000
(1) Includes hedged and non-hedged derivatives.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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