FAIR VALUE - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financial Assets:
Investment securities HTM	$ 9,058	$ 10,025
Carrying Amount
Financial Assets:
Cash and cash equivalents	503,829	596,553
Investment securities AFS	11,810	13,351
Investment securities HTM	9,897	9,918
Restricted stock	5,157	5,144
Loans, net	1,465,858	1,455,002
Accrued interest receivable	7,344	7,681
Financial Liabilities:
Non-time deposits	1,136,827	1,174,664
Time deposits	540,383	593,746
Borrowings	120,929	120,882
Accrued interest payable	1,029	1,603
Fair Value
Financial Assets:
Cash and cash equivalents	503,829	596,553
Investment securities AFS	11,810	13,351
Investment securities HTM	9,058	10,025
Restricted stock	5,157	5,144
Loans, net	1,431,268	1,440,398
Accrued interest receivable	7,344	7,681
Financial Liabilities:
Non-time deposits	1,136,827	1,174,664
Time deposits	543,987	597,791
Borrowings	116,455	117,636
Accrued interest payable	1,029	1,603
Fair Value | Level 1
Financial Assets:
Cash and cash equivalents	503,829	596,553
Investment securities AFS	0	0
Investment securities HTM	0	0
Restricted stock	0	0
Loans, net	0	0
Accrued interest receivable	0	0
Financial Liabilities:
Non-time deposits	0	0
Time deposits	0	0
Borrowings	0	0
Accrued interest payable	0	0
Fair Value | Level 2
Financial Assets:
Cash and cash equivalents	0	0
Investment securities AFS	11,810	13,351
Investment securities HTM	9,058	10,025
Restricted stock	0	0
Loans, net	1,426,302	1,430,686
Accrued interest receivable	7,344	7,681
Financial Liabilities:
Non-time deposits	1,136,827	1,174,664
Time deposits	543,987	597,791
Borrowings	116,455	117,636
Accrued interest payable	1,029	1,603
Fair Value | Level 3
Financial Assets:
Cash and cash equivalents	0	0
Investment securities AFS	0	0
Investment securities HTM	0	0
Restricted stock	5,157	5,144
Loans, net	4,966	9,712
Accrued interest receivable	0	0
Financial Liabilities:
Non-time deposits	0	0
Time deposits	0	0
Borrowings	0	0
Accrued interest payable	$ 0	$ 0