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DEPOSITS (Tables) | 12 Months Ended
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Dec. 31, 2019
Deposits, Interest-bearing and Noninterest-bearing, Alternative [Abstract] |
Schedule of Deposits by Type | The major types of interest-bearing deposits are as follows for the years ended December 31, (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Interest-bearing deposits: |  | ​ |  |  | ​ |
NOW accounts | ​ | $ | 2,905,714 | ​ | $ | 2,288,523
Money market accounts | ​ |  | 3,951,856 | ​ |  | 2,875,301
Savings accounts | ​ |  | 727,847 | ​ |  | 622,823
Time deposits of $250,000 and over | ​ |  | 684,797 | ​ |  | 292,224
Other time deposits | ​ |  | 2,064,628 | ​ |  | 1,797,482
Total interest-bearing deposits | ​ | $ | 10,334,842 | ​ | $ | 7,876,353
Scheduled Maturities of Time Deposits | As of December 31, 2019, the scheduled maturities of time deposits are as follows for the years ended December 31, (dollars in thousands): ​
​ | ​ | ​ | ​
2020 |  | $ | 1,626,492
2021 | ​ |  | 621,567
2022 | ​ |  | 199,507
2023 | ​ |  | 140,722
2024 | ​ |  | 160,465
Thereafter | ​ |  | 672
Total scheduled maturities of time deposits | ​ | $ | 2,749,425

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