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FAIR VALUE MEASUREMENTS (Tables) | 9 Months Ended
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Sep. 30, 2024
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 the periods ended (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements at September 30, 2024 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 | ​ | $ | 62,683 | ​ | $ | 3,988 | ​ | $ | — | ​ | $ | 66,671
Obligations of states and political subdivisions | ​ |  | — | ​ |  | 488,527 | ​ |  | — | ​ |  | 488,527
Corporate and other bonds(1) | ​ |  | — | ​ |  | 271,975 | ​ |  | — | ​ |  | 271,975
MBS | ​ |  | — | ​ |  | 1,779,177 | ​ |  | — | ​ |  | 1,779,177
Other securities | ​ |  | — | ​ |  | 1,832 | ​ |  | — | ​ |  | 1,832
LHFS | ​ |  | — | ​ |  | 11,078 | ​ |  | — | ​ |  | 11,078
Financial Derivatives(2) | ​ |  | — | ​ |  | 91,418 | ​ |  | — | ​ |  | 91,418
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Financial Derivatives(2) | ​ | $ | — | ​ | $ | 170,118 | ​ | $ | — | ​ | $ | 170,118
(1) Other bonds include asset-backed securities. (2) Includes hedged and non-hedged derivatives. ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements at December 31, 2023 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.
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 the periods ended are as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements at September 30, 2024 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 | ​ | $ | 528,070 | ​ | $ | 528,070 | ​ | $ | — | ​ | $ | — | ​ | $ | 528,070
AFS securities | ​ |  | 2,608,182 | ​ |  | 62,683 | ​ |  | 2,545,499 | ​ |  | — | ​ |  | 2,608,182
HTM securities | ​ |  | 807,080 | ​ |  | — | ​ |  | 775,630 | ​ |  | 1,197 | ​ |  | 776,827
Restricted stock | ​ |  | 117,881 | ​ |  | — | ​ |  | 117,881 | ​ |  | — | ​ |  | 117,881
LHFS | ​ |  | 11,078 | ​ |  | — | ​ |  | 11,078 | ​ |  | — | ​ |  | 11,078
LHFI, net of deferred fees and costs | ​ |  | 18,337,299 | ​ |  | — | ​ |  | — | ​ |  | 17,721,302 | ​ |  | 17,721,302
Financial Derivatives (1) | ​ |  | 91,418 | ​ |  | — | ​ |  | 91,418 | ​ |  | — | ​ |  | 91,418
Accrued interest receivable | ​ |  | 93,603 | ​ |  | — | ​ |  | 93,603 | ​ |  | — | ​ |  | 93,603
BOLI | ​ |  | 489,759 | ​ |  | — | ​ |  | 489,759 | ​ |  | — | ​ |  | 489,759
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Deposits | ​ | $ | 20,305,287 | ​ | $ | — | ​ | $ | 20,310,505 | ​ | $ | — | ​ | $ | 20,310,505
Borrowings | ​ |  | 852,164 | ​ |  | — | ​ |  | 787,333 | ​ |  | — | ​ |  | 787,333
Accrued interest payable | ​ |  | 26,751 | ​ |  | — | ​ |  | 26,751 | ​ |  | — | ​ |  | 26,751
Financial Derivatives (1) | ​ |  | 170,118 | ​ |  | — | ​ |  | 170,118 | ​ |  | — | ​ |  | 170,118
(1) Includes hedged and non-hedged derivatives. ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements at December 31, 2023 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.

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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 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/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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