FAIR VALUE OF FINANCIAL INSTRUMENTS (Carrying Amount and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financial assets:
Securities available for sale	$ 505,728	$ 566,624
Securities held to maturity	436,800	380,100
Financial liabilities:
Noninterest-bearing demand deposits	3,176,048	3,668,673
Carrying Amount
Financial assets:
Cash and due from banks	32,483	28,864
Overnight deposits	1,381,475	2,330,486
Securities held to maturity	467,893	382,099
Loans, net	4,083,309	3,697,200
Other investments
FRB Stock	11,421	7,430
FHLB Stock	3,070	3,070
Disability Fund	1,000	1,000
Time deposits at banks	498
CRA - CD		498
Receivables from prepaid card programs, net	62,129	39,864
Accrued interest receivable	16,186	15,195
Financial liabilities:
Noninterest-bearing demand deposits	3,176,048	3,668,673
Money market and savings deposits	2,689,424	2,687,913
Time deposits	73,891	78,986
Trust preferred securities payable	20,620	20,620
Subordinated debt, net of issuance cost		24,712
Prepaid debit cardholder balances	24,092	8,847
Accrued interest payable	297	746
Secured Borrowings	32,322	32,461
Total Fair Value
Financial assets:
Cash and due from banks	32,483	28,864
Overnight deposits	1,381,475	2,330,486
Securities held to maturity	436,825	380,108
Loans, net	4,111,399	3,721,619
Other investments
Disability Fund	1,000	1,000
Time deposits at banks	498
CRA - CD		498
Receivables from prepaid card programs, net	62,129	39,864
Accrued interest receivable	16,186	15,195
Financial liabilities:
Noninterest-bearing demand deposits	3,176,048	3,668,673
Money market and savings deposits	2,689,424	2,687,913
Time deposits	73,233	79,187
Trust preferred securities payable	19,965	19,997
Subordinated debt, net of issuance cost		25,125
Prepaid debit cardholder balances	24,092	8,847
Accrued interest payable	297	746
Secured Borrowings	32,322	32,507
Fair Value, Inputs, Level 1
Financial assets:
Cash and due from banks	32,483	28,864
Overnight deposits	1,381,475	2,330,486
Other investments
Time deposits at banks	498
CRA - CD		498
Financial liabilities:
Noninterest-bearing demand deposits	3,176,048	3,668,673
Money market and savings deposits	2,689,424	2,687,913
Accrued interest payable	5	5
Fair Value, Inputs, Level 2
Financial assets:
Securities held to maturity	436,825	380,108
Other investments
Disability Fund	1,000	1,000
Accrued interest receivable	765	892
Financial liabilities:
Time deposits	73,233	79,187
Subordinated debt, net of issuance cost		25,125
Accrued interest payable	180	633
Secured Borrowings	32,322	32,507
Fair Value, Inputs, Level 3
Financial assets:
Loans, net	4,111,399	3,721,619
Other investments
Receivables from prepaid card programs, net	62,129	39,864
Accrued interest receivable	15,421	14,303
Financial liabilities:
Trust preferred securities payable	19,965	19,997
Prepaid debit cardholder balances	24,092	8,847
Accrued interest payable	$ 112	$ 108