SECURITIES (Securities Pledged) (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Pledged Financial Instruments, Not Separately Reported, Securities [Abstract]
Securities pledged for State and Local Government Public Deposits, Carrying Value	$ 127,661
Securities pledged for Interest Rate Swap Counterparties, Carrying Value	16,172
Securities pledged for Repurchase Agreements, Carrying Value	127,632
Pledged Financial Instruments, Not Separately Reported, Interest-bearing Deposits for Other Debt Facilities	3,949
Total pledged securities, Carrying Value	275,414
Securities pledged for State and Local Government public deposits, Amortized Cost	127,549
Securities pledged for Interest Rate Swap Counterparties, Amortized Cost	16,197
Securities pledged for Repurchase Agreements, Amortized Cost	127,803
Pledged Financial Instruments, Not Separately Reported, Interest-bearing Deposits for Other Debt Facilities, Amortized Cost	3,948
Total pledged securities, Amortized Cost	275,497
Securities pledged for State and Local Government Public Deposits, Fair Value	130,380
Securities pledged for Interest Rate Swap Counterparties, Fair Value	16,218
Securities pledged for Retail Repurchase Agreements, Fair Value	127,797
Pledged Financial Instruments, Not Separately Reported, Interest-bearing Deposits for Other Debt Facilities, Fair Value	3,888
Total pledged securities, Fair Value	$ 278,283