SECURITIES (Securities Pledged) (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Pledged Financial Instruments, Not Separately Reported, Securities [Abstract]
Securities pledged for State and Local Government Public Deposits, Carrying Value	$ 152,148
Securities pledged for Interest Rate Swap Counterparties, Carrying Value	29,623
Securities pledged for Repurchase Agreements, Carrying Value	204,034
Pledged Financial Instruments, Not Separately Reported, Interest-bearing Deposits for Other Debt Facilities	2,627
Total pledged securities, Carrying Value	388,432
Securities pledged for State and Local Government public deposits, Amortized Cost	151,455
Securities pledged for Interest Rate Swap Counterparties, Amortized Cost	28,473
Securities pledged for Repurchase Agreements, Amortized Cost	194,374
Pledged Financial Instruments, Not Separately Reported, Interest-bearing Deposits for Other Debt Facilities, Amortized Cost	2,627
Total pledged securities, Amortized Cost	376,929
Securities pledged for State and Local Government Public Deposits, Fair Value	161,497
Securities pledged for Interest Rate Swap Counterparties, Fair Value	29,849
Securities pledged for Retail Repurchase Agreements, Fair Value	204,034
Pledged Financial Instruments, Not Separately Reported, Interest-bearing Deposits for Other Debt Facilities, Fair Value	2,707
Total pledged securities, Fair Value	$ 398,087