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COMMITMENTS AND CONTINGENCIES (Tables) | 6 Months Ended
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Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract] |
Balances of Commitments and Contingencies | The following table presents the balances of commitments and contingencies as of the following dates (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2023 |  | December 31, 2022
Commitments with off-balance sheet risk: |  | ​ |  |  | ​ |
Commitments to extend credit(1) | ​ | $ | 5,516,243 | ​ | $ | 5,229,252
Letters of credit | ​ |  | 148,908 | ​ |  | 156,459
Total commitments with off-balance sheet risk | ​ | $ | 5,665,151 | ​ | $ | 5,385,711
(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, it 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 at June 30, 2023 and December 31, 2022 (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pledged Assets as of June 30, 2023 | ​ | ​ | ​
​ |  | ​ | ​ |  | AFS |  | HTM |  | ​ | ​ |  | ​ | ​
​ | ​ | Cash | ​ | Securities (1) | ​ | Securities (1) | ​ | Loans (2) | ​ | Total
Public deposits | ​ | $ | — | ​ | $ | 749,791 | ​ | $ | 614,269 | ​ | $ | — | ​ | $ | 1,364,060
Repurchase agreements | ​ |  | — | ​ |  | 174,364 | ​ |  | — | ​ |  | — | ​ |  | 174,364
FHLB advances | ​ |  | — | ​ |  | 55,309 | ​ |  | — | ​ |  | 3,181,541 | ​ |  | 3,236,850
Derivatives | ​ |  | 187,873 | ​ |  | 57,345 | ​ |  | — | ​ |  | — | ​ |  | 245,218
Fed Funds (3) | ​ | ​ | — | ​ | ​ | 423,257 | ​ | ​ | 17,696 | ​ | ​ | 432,704 | ​ | ​ | 873,657
Other purposes | ​ |  | — | ​ | ​ | 22,404 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 22,404
Total pledged assets | ​ | $ | 187,873 | ​ | $ | 1,482,470 | ​ | $ | 631,965 | ​ | $ | 3,614,245 | ​ | $ | 5,916,553
(1) Balance represents market value. (2) Balance represents carrying value. (3) Includes AFS and HTM securities pledged under the BTFP program. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pledged Assets as of December 31, 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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