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COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2019
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): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Commitments with off-balance sheet risk: |  | ​ |  |  | ​ |
Commitments to extend credit (1) | ​ | $ | 4,691,272 | ​ | $ | 3,167,085
Standby letters of credit | ​ |  | 209,658 | ​ |  | 167,597
Total commitments with off-balance sheet risk | ​ | $ | 4,900,930 | ​ | $ | 3,334,682
​ | ​ | ​ | ​ | ​ | ​ | ​
(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 December 31, 2019 and 2018 (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 market value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(2) Balance represents book value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pledged Assets as of December 31, 2018 | ​ | ​ | ​
​ |  | ​ | ​ |  | AFS |  | HTM |  | ​ | ​ |  | ​ | ​
​ | ​ | Cash | ​ | Securities (1) | ​ | Securities (1) | ​ | Loans (2) | ​ | Total
Public deposits | ​ | $ | — | ​ | $ | 293,169 | ​ | $ | 7,407 | ​ | $ | — | ​ | $ | 300,576
Repurchase agreements | ​ |  | — | ​ |  | 55,269 | ​ |  | — | ​ |  | — | ​ |  | 55,269
FHLB advances | ​ |  | — | ​ |  | 488 | ​ |  | — | ​ |  | 3,337,289 | ​ |  | 3,337,777
Derivatives | ​ |  | 13,509 | ​ |  | 1,938 | ​ |  | — | ​ |  | — | ​ |  | 15,447
Other purposes | ​ |  | — | ​ |  | 23,217 | ​ |  | — | ​ |  | — | ​ |  | 23,217
Total pledged assets | ​ | $ | 13,509 | ​ | $ | 374,081 | ​ | $ | 7,407 | ​ | $ | 3,337,289 | ​ | $ | 3,732,286
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) Balance represents book value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(2) Balance represents market value. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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