SECURITIES (Securities Pledged) (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Pledged Financial Instruments, Not Separately Reported, Securities [Abstract]
Securities pledged for State and Local Government Public Deposits, Carrying Value	$ 202,085
Securities pledged for Interest Rate Swap Counterparties, Carrying Value	27,275
Securities pledged for Repurchase Agreements, Carrying Value	278,087
Pledged Financial Instruments, Not Separately Reported, Interest-bearing Deposits for Other Debt Facilities	2,549
Total pledged securities, Carrying Value	509,996
Securities pledged for State and Local Government public deposits, Amortized Cost	201,456
Securities pledged for Interest Rate Swap Counterparties, Amortized Cost	26,642
Securities pledged for Repurchase Agreements, Amortized Cost	285,068
Pledged Financial Instruments, Not Separately Reported, Interest-bearing Deposits for Other Debt Facilities, Amortized Cost	2,549
Total pledged securities, Amortized Cost	515,715
Securities pledged for State and Local Government Public Deposits, Fair Value	213,687
Securities pledged for Interest Rate Swap Counterparties, Fair Value	27,402
Securities pledged for Retail Repurchase Agreements, Fair Value	278,087
Pledged Financial Instruments, Not Separately Reported, Interest-bearing Deposits for Other Debt Facilities, Fair Value	2,597
Total pledged securities, Fair Value	$ 521,773