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COMMITMENTS AND CONTINGENCIES (Tables) | 9 Months Ended
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Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract] |
Balances of Commitments and Contingencies | The following table presents the balances of commitments and contingencies (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2020 |  | December 31, 2019
Commitments with off-balance sheet risk: |  | ​ |  |  | ​ |
Commitments to extend credit (1) | ​ | $ | 4,631,361 | ​ | $ | 4,691,272
Letters of credit | ​ |  | 164,303 | ​ |  | 209,658
Total commitments with off-balance sheet risk | ​ | $ | 4,795,664 | ​ | $ | 4,900,930
(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, 2020 and December 31, 2019 (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pledged Assets as of September 30, 2020 | ​ | ​ | ​
​ |  | ​ | ​ |  | AFS |  | HTM |  | ​ | ​ |  | ​ | ​
​ | ​ | Cash | ​ | Securities (1) | ​ | Securities (1) | ​ | Loans (2) | ​ | Total
Public deposits | ​ | $ | — | ​ | $ | 476,167 | ​ | $ | 432,791 | ​ | $ | — | ​ | $ | 908,958
Repurchase agreements | ​ |  | — | ​ |  | 111,781 | ​ |  | — | ​ |  | — | ​ |  | 111,781
FHLB advances | ​ |  | — | ​ |  | 54,195 | ​ |  | — | ​ |  | 4,354,063 | ​ |  | 4,408,258
Derivatives | ​ |  | 276,786 | ​ |  | 939 | ​ |  | — | ​ |  | — | ​ |  | 277,725
Fed Funds | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 316,561 | ​ | ​ | 316,561
PPP Loans | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 189,945 | ​ | ​ | 189,945
Other purposes | ​ |  | — | ​ | ​ | 124,517 | ​ | ​ | 8,862 | ​ | ​ | — | ​ | ​ | 133,379
Total pledged assets | ​ | $ | 276,786 | ​ | $ | 767,599 | ​ | $ | 441,653 | ​ | $ | 4,860,569 | ​ | $ | 6,346,607
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) Balance represents market value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(2) Balance represents book value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pledged Assets as of December 31, 2019 | ​ | ​ | ​
​ |  | ​ | ​ |  | AFS |  | HTM |  | ​ | ​ |  | ​ | ​
​ | ​ | Cash | ​ | Securities (1) | ​ | Securities (1) | ​ | Loans (2) | ​ | Total
Public deposits | ​ | $ | — | ​ | $ | 467,266 | ​ | $ | 292,096 | ​ | $ | — | ​ | $ | 759,362
Repurchase agreements | ​ |  | — | ​ |  | 79,299 | ​ |  | 7,602 | ​ |  | — | ​ |  | 86,901
FHLB advances | ​ |  | — | ​ |  | 63,812 | ​ |  | — | ​ |  | 3,846,934 | ​ |  | 3,910,746
Derivatives | ​ |  | 116,839 | ​ |  | 1,260 | ​ |  | — | ​ |  | — | ​ |  | 118,099
Fed Funds | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 292,738 | ​ | ​ | 292,738
Other purposes | ​ |  | — | ​ |  | 122,358 | ​ |  | 10,654 | ​ |  | — | ​ |  | 133,012
Total pledged assets | ​ | $ | 116,839 | ​ | $ | 733,995 | ​ | $ | 310,352 | ​ | $ | 4,139,672 | ​ | $ | 5,300,858
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) Balance represents book value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(2) Balance represents market value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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