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COMMITMENTS AND CONTINGENCIES (Tables) | 9 Months Ended
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Sep. 30, 2021
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):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2021 |  | December 31, 2020
Commitments with off-balance sheet risk: |  | ​ |  |  | ​ |
Commitments to extend credit (1) | ​ | $ | 5,793,342 | ​ | $ | 4,722,412
Letters of credit | ​ |  | 153,350 | ​ |  | 161,827
Total commitments with off-balance sheet risk | ​ | $ | 5,946,692 | ​ | $ | 4,884,239
(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 September 30, 2021 and December 31, 2020 (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pledged Assets as of September 30, 2021 | ​ | ​ | ​
​ |  | ​ | ​ |  | AFS |  | HTM |  | ​ | ​ |  | ​ | ​
​ | ​ | Cash | ​ | Securities (1) | ​ | Securities (1) | ​ | Loans (2) | ​ | Total
Public deposits | ​ | $ | — | ​ | $ | 662,373 | ​ | $ | 424,355 | ​ | $ | — | ​ | $ | 1,086,728
Repurchase agreements | ​ |  | — | ​ |  | 131,669 | ​ |  | — | ​ |  | — | ​ |  | 131,669
FHLB advances | ​ |  | — | ​ |  | 45,976 | ​ |  | — | ​ |  | 4,282,408 | ​ |  | 4,328,384
Derivatives | ​ |  | 88,446 | ​ |  | 65,615 | ​ |  | — | ​ |  | — | ​ |  | 154,061
Fed Funds | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 361,987 | ​ | ​ | 361,987
Other purposes | ​ |  | — | ​ | ​ | 21,424 | ​ | ​ | 976 | ​ | ​ | — | ​ | ​ | 22,400
Total pledged assets | ​ | $ | 88,446 | ​ | $ | 927,057 | ​ | $ | 425,331 | ​ | $ | 4,644,395 | ​ | $ | 6,085,229
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) Balance represents market value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(2) Balance represents book value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pledged Assets as of December 31, 2020 | ​ | ​ | ​
​ |  | ​ | ​ |  | AFS |  | HTM |  | ​ | ​ |  | ​ | ​
​ | ​ | Cash | ​ | Securities (1) | ​ | Securities (1) | ​ | Loans (2) | ​ | Total
Public deposits | ​ | $ | — | ​ | $ | 469,864 | ​ | $ | 436,449 | ​ | $ | — | ​ | $ | 906,313
Repurchase agreements | ​ |  | — | ​ |  | 116,876 | ​ |  | — | ​ |  | — | ​ |  | 116,876
FHLB advances | ​ |  | — | ​ |  | 52,323 | ​ |  | — | ​ |  | 4,374,383 | ​ |  | 4,426,706
Derivatives | ​ |  | 251,047 | ​ |  | 785 | ​ |  | — | ​ |  | — | ​ |  | 251,832
Fed Funds | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 340,847 | ​ | ​ | 340,847
Other purposes | ​ |  | — | ​ |  | 123,388 | ​ |  | 8,634 | ​ |  | — | ​ |  | 132,022
Total pledged assets | ​ | $ | 251,047 | ​ | $ | 763,236 | ​ | $ | 445,083 | ​ | $ | 4,715,230 | ​ | $ | 6,174,596
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) Balance represents market value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(2) Balance represents book value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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