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DEPOSITS (Tables) | 12 Months Ended
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Dec. 31, 2020
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): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Interest-bearing deposits: |  | ​ |  |  | ​ |
NOW accounts | ​ | $ | 3,621,181 | ​ | $ | 2,905,714
Money market accounts | ​ |  | 4,248,335 | ​ |  | 3,951,856
Savings accounts | ​ |  | 904,095 | ​ |  | 727,847
Time deposits of $250,000 and over | ​ |  | 654,224 | ​ |  | 684,797
Other time deposits | ​ |  | 1,926,227 | ​ |  | 2,064,628
Total interest-bearing deposits | ​ | $ | 11,354,062 | ​ | $ | 10,334,842
Scheduled Maturities of Time Deposits | As of December 31, 2020, the scheduled maturities of time deposits are as follows for the years ended December 31, (dollars in thousands): ​
​ | ​ | ​ | ​
2021 |  | $ | 1,846,844
2022 | ​ |  | 369,810
2023 | ​ |  | 160,021
2024 | ​ |  | 171,968
2025 | ​ |  | 31,250
Thereafter | ​ |  | 558
Total scheduled maturities of time deposits | ​ | $ | 2,580,451

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