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FAIR VALUE MEASUREMENTS (Tables) | 9 Months Ended
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Sep. 30, 2025
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, 2025 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 | ​ | $ | 113,159 | ​ | $ | 16,122 | ​ | $ | — | ​ | $ | 129,281
Obligations of states and political subdivisions | ​ |  | — | ​ |  | 481,515 | ​ |  | — | ​ |  | 481,515
Corporate and other bonds(1) | ​ |  | — | ​ |  | 246,155 | ​ |  | — | ​ |  | 246,155
MBS | ​ |  | — | ​ |  | 3,408,640 | ​ |  | — | ​ |  | 3,408,640
Other securities | ​ |  | — | ​ |  | 1,932 | ​ |  | — | ​ |  | 1,932
LHFS | ​ |  | — | ​ |  | 24,772 | ​ |  | — | ​ |  | 24,772
Financial Derivatives(2) | ​ |  | — | ​ |  | 110,293 | ​ |  | — | ​ |  | 110,293
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Financial Derivatives(2) | ​ | $ | — | ​ | $ | 170,694 | ​ | $ | — | ​ | $ | 170,694
(1) Other bonds include asset-backed securities. (2) Includes hedged and non-hedged derivatives. ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements at December 31, 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 | ​ | $ | 62,199 | ​ | $ | 3,814 | ​ | $ | — | ​ | $ | 66,013
Obligations of states and political subdivisions | ​ |  | — | ​ |  | 468,337 | ​ |  | — | ​ |  | 468,337
Corporate and other bonds(1) | ​ |  | — | ​ |  | 244,712 | ​ |  | — | ​ |  | 244,712
MBS | ​ |  | — | ​ |  | 1,661,244 | ​ |  | — | ​ |  | 1,661,244
Other securities | ​ |  | — | ​ |  | 1,860 | ​ |  | — | ​ |  | 1,860
LHFS | ​ |  | — | ​ |  | 9,420 | ​ |  | — | ​ |  | 9,420
Financial Derivatives(2) | ​ |  | — | ​ |  | 97,445 | ​ |  | — | ​ |  | 97,445
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Financial Derivatives(2) | ​ | $ | — | ​ | $ | 199,548 | ​ | $ | — | ​ | $ | 199,548
(1) Other bonds include asset-backed securities. (2) Includes hedged and non-hedged derivatives.
Schedule of Financial Assets Measured at Fair Value on Nonrecurring Basis | ​ The following tables summarize the Company’s financial assets that were measured on a nonrecurring basis as of the periods ended (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements at September 30, 2025 using
​ |  | ​ | ​ |  | Significant |  | ​ | ​ |  | ​ | ​
​ | ​ | Quoted Prices in | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | Active Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
​ | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Balance
ASSETS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Individually assessed loans(1) | ​ | $ | — | ​ | $ | — | ​ | $ | 1,736 | ​ | $ | 1,736
(1) Net of reserves of $299,000 related to collateral dependent loans as of September 30, 2025. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements at December 31, 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 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Individually assessed loans(1) | ​ | $ | — | ​ | $ | — | ​ | $ | 14,636 | ​ | $ | 14,636
(1) Net of reserves of $13.1 million related to collateral dependent loans as of December 31, 2024. ​
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, 2025 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 | ​ | $ | 794,665 | ​ | $ | 794,665 | ​ | $ | — | ​ | $ | — | ​ | $ | 794,665
AFS securities | ​ |  | 4,267,523 | ​ |  | 113,159 | ​ |  | 4,154,364 | ​ |  | — | ​ |  | 4,267,523
HTM securities | ​ |  | 883,786 | ​ |  | — | ​ |  | 847,198 | ​ |  | 901 | ​ |  | 848,099
Restricted stock | ​ |  | 159,320 | ​ |  | — | ​ |  | 159,320 | ​ |  | — | ​ |  | 159,320
LHFS | ​ |  | 24,772 | ​ |  | — | ​ |  | 24,772 | ​ |  | — | ​ |  | 24,772
LHFI, net of deferred fees and costs | ​ |  | 27,361,173 | ​ |  | — | ​ |  | — | ​ |  | 27,055,519 | ​ |  | 27,055,519
Financial Derivatives (1) | ​ |  | 110,293 | ​ |  | — | ​ |  | 110,293 | ​ |  | — | ​ |  | 110,293
Accrued interest receivable | ​ |  | 127,788 | ​ |  | — | ​ |  | 127,788 | ​ |  | — | ​ |  | 127,788
BOLI | ​ |  | 669,102 | ​ |  | — | ​ |  | 669,102 | ​ |  | — | ​ |  | 669,102
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Deposits | ​ | $ | 30,665,324 | ​ | $ | — | ​ | $ | 30,658,640 | ​ | $ | — | ​ | $ | 30,658,640
Borrowings | ​ |  | 860,312 | ​ |  | — | ​ |  | 780,165 | ​ |  | — | ​ |  | 780,165
Accrued interest payable | ​ |  | 22,128 | ​ |  | — | ​ |  | 22,128 | ​ |  | — | ​ |  | 22,128
Financial Derivatives (1) | ​ |  | 170,694 | ​ |  | — | ​ |  | 170,694 | ​ |  | — | ​ |  | 170,694
(1) Includes hedged and non-hedged derivatives. ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements at December 31, 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 | ​ | $ | 354,074 | ​ | $ | 354,074 | ​ | $ | — | ​ | $ | — | ​ | $ | 354,074
AFS securities | ​ |  | 2,442,166 | ​ |  | 62,199 | ​ |  | 2,379,967 | ​ |  | — | ​ |  | 2,442,166
HTM securities | ​ |  | 803,851 | ​ |  | — | ​ |  | 758,400 | ​ |  | 935 | ​ |  | 759,335
Restricted stock | ​ |  | 102,954 | ​ |  | — | ​ |  | 102,954 | ​ |  | — | ​ |  | 102,954
LHFS | ​ |  | 9,420 | ​ |  | — | ​ |  | 9,420 | ​ |  | — | ​ |  | 9,420
LHFI, net of deferred fees and costs | ​ |  | 18,470,621 | ​ |  | — | ​ |  | — | ​ |  | 17,896,688 | ​ |  | 17,896,688
Financial Derivatives (1) | ​ |  | 97,445 | ​ |  | — | ​ |  | 97,445 | ​ |  | — | ​ |  | 97,445
Accrued interest receivable | ​ |  | 92,541 | ​ |  | — | ​ |  | 92,541 | ​ |  | — | ​ |  | 92,541
BOLI | ​ |  | 493,396 | ​ |  | — | ​ |  | 493,396 | ​ |  | — | ​ |  | 493,396
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Deposits | ​ | $ | 20,397,619 | ​ | $ | — | ​ | $ | 20,393,673 | ​ | $ | — | ​ | $ | 20,393,673
Borrowings | ​ |  | 534,578 | ​ |  | — | ​ |  | 471,671 | ​ |  | — | ​ |  | 471,671
Accrued interest payable | ​ |  | 26,214 | ​ |  | — | ​ |  | 26,214 | ​ |  | — | ​ |  | 26,214
Financial Derivatives (1) | ​ |  | 199,548 | ​ |  | — | ​ |  | 199,548 | ​ |  | — | ​ |  | 199,548
(1) Includes hedged and non-hedged derivatives.

X
- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 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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- 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://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -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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