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DEPOSITS - Types and Components of Deposit Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Noninterest bearing demand deposits:    
Noninterest bearing demand deposits $ 1,644,775 $ 1,354,815
Interest bearing deposits:    
Total interest bearing deposits 4,077,552 3,577,507
Total deposits 5,722,327 4,932,322
Private accounts    
Noninterest bearing demand deposits:    
Noninterest bearing demand deposits 1,591,123 1,309,380
Interest bearing deposits:    
Savings accounts 643,939 495,641
Money market demand accounts 449,977 429,687
Platinum money market accounts 438,781 381,877
Interest bearing checking accounts 1,216,189 835,489
NOW demand accounts 18,376 17,377
CDs of $250,000 or more 68,950 77,819
CDs under $250,000 316,028 474,503
Total interest bearing deposits 3,152,240 2,712,393
Public accounts    
Noninterest bearing demand deposits:    
Noninterest bearing demand deposits 53,652 45,435
Interest bearing deposits:    
Savings accounts 965 347
Money market demand accounts 32,487 19,080
Platinum money market accounts 371,032 321,601
Interest bearing checking accounts 100,581 81,673
NOW demand accounts 240,200 203,638
CDs of $250,000 or more 176,190 227,201
CDs under $250,000 3,857 11,574
Total interest bearing deposits $ 925,312 $ 865,114