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COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract] |
Balances of Commitments and Contingencies | The following table presents the balances of commitments and contingencies as of December 31, (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Commitments with off-balance sheet risk: |  | ​ |  |  | ​ |
Commitments to extend credit(1) | ​ | $ | 5,961,238 | ​ | $ | 5,418,580
Letters of credit | ​ |  | 140,498 | ​ |  | 156,459
Total commitments with off-balance sheet risk | ​ | $ | 6,101,736 | ​ | $ | 5,575,039
(1) Includes unfunded overdraft protection.
Schedule of Pledged Assets, Not Separately Reported on Statement of Financial Position | As part of the Company’s liquidity management strategy, the Company pledges collateral to secure various financing and other activities that occur during the normal course of business. The following tables present the types of collateral pledged as of December 31, (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pledged Assets 2023 | ​ | ​ | ​
​ |  | ​ | ​ |  | AFS |  | HTM |  | ​ | ​ |  | ​ | ​
​ | ​ | Cash | ​ | Securities (1) | ​ | Securities (1) | ​ | Loans (2) | ​ | Total
Public deposits | ​ | $ | — | ​ | $ | 749,398 | ​ | $ | 621,494 | ​ | $ | — | ​ | $ | 1,370,892
Repurchase agreements | ​ |  | — | ​ |  | 174,075 | ​ |  | — | ​ |  | — | ​ |  | 174,075
FHLB advances | ​ |  | — | ​ |  | 48,718 | ​ |  | — | ​ |  | 2,960,926 | ​ |  | 3,009,644
Derivatives | ​ |  | 154,382 | ​ |  | 61,311 | ​ |  | — | ​ |  | — | ​ |  | 215,693
Fed Funds (3) | ​ | ​ | — | ​ | ​ | 411,661 | ​ | ​ | 17,356 | ​ | ​ | 418,468 | ​ | ​ | 847,485
Other purposes | ​ |  | — | ​ | ​ | 15,591 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15,591
Total pledged assets | ​ | $ | 154,382 | ​ | $ | 1,460,754 | ​ | $ | 638,850 | ​ | $ | 3,379,394 | ​ | $ | 5,633,380
(1) Balance represents market value. (2) Balance represents book value. (3) Includes AFS and HTM securities pledged under the BTFP program ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pledged Assets 2022 | ​ | ​ | ​
​ |  | ​ | ​ |  | AFS |  | HTM |  | ​ | ​ |  | ​ | ​
​ | ​ | Cash | ​ | Securities (1) | ​ | Securities (1) | ​ | Loans (2) | ​ | Total
Public deposits | ​ | $ | — | ​ | $ | 713,761 | ​ | $ | 579,550 | ​ | $ | — | ​ | $ | 1,293,311
Repurchase agreements | ​ |  | — | ​ | ​ | 159,221 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 159,221
FHLB advances | ​ |  | — | ​ | ​ | 36,039 | ​ | ​ | — | ​ | ​ | 2,679,316 | ​ | ​ | 2,715,355
Derivatives | ​ |  | 196,180 | ​ | ​ | 57,114 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 253,294
Fed Funds | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 458,680 | ​ | ​ | 458,680
Other purposes | ​ |  | — | ​ | ​ | 27,311 | ​ | ​ | 865 | ​ | ​ | — | ​ | ​ | 28,176
Total pledged assets | ​ | $ | 196,180 | ​ | $ | 993,446 | ​ | $ | 580,415 | ​ | $ | 3,137,996 | ​ | $ | 4,908,037
(1) Balance represents market value. (2) Balance represents book value.

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