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COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2022
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): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Commitments with off-balance sheet risk: |  | ​ |  |  | ​ |
Commitments to extend credit (1) | ​ | $ | 5,229,252 | ​ | $ | 5,825,557
Letters of credit | ​ |  | 156,459 | ​ |  | 152,506
Total commitments with off-balance sheet risk | ​ | $ | 5,385,711 | ​ | $ | 5,978,063
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 December 31, 2022 and 2021 (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pledged Assets as of December 31, 2021 | ​ | ​ | ​
​ |  | ​ | ​ |  | AFS |  | HTM |  | ​ | ​ |  | ​ | ​
​ | ​ | Cash | ​ | Securities (1) | ​ | Securities (1) | ​ | Loans (2) | ​ | Total
Public deposits | ​ | $ | — | ​ | $ | 703,489 | ​ | $ | 472,243 | ​ | $ | — | ​ | $ | 1,175,732
Repurchase agreements | ​ |  | — | ​ |  | 130,217 | ​ |  | — | ​ |  | — | ​ |  | 130,217
FHLB advances | ​ |  | — | ​ |  | 43,722 | ​ |  | — | ​ |  | 4,263,259 | ​ |  | 4,306,981
Derivatives | ​ |  | 82,299 | ​ |  | 65,053 | ​ |  | — | ​ |  | — | ​ |  | 147,352
Fed Funds | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 392,067 | ​ | ​ | 392,067
Other purposes | ​ |  | — | ​ | ​ | 22,003 | ​ | ​ | 985 | ​ | ​ | — | ​ | ​ | 22,988
Total pledged assets | ​ | $ | 82,299 | ​ | $ | 964,484 | ​ | $ | 473,228 | ​ | $ | 4,655,326 | ​ | $ | 6,175,337
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) Balance represents market value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(2) Balance represents book value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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