SECURITIES (Securities Pledged) (Details) $ in Thousands	Mar. 31, 2017 USD ($)
Pledged Financial Instruments, Not Separately Reported, Securities [Abstract]
Securities pledged for State and Local Government Public Deposits, Carrying Value	$ 145,600
Securities pledged for Interest Rate Swap Counterparties, Carrying Value	24,233
Securities pledged for Repurchase Agreements, Carrying Value	136,835
Pledged Financial Instruments, Not Separately Reported, Interest-bearing Deposits for Other Debt Facilities	1,673
Total pledged securities, Carrying Value	308,341
Securities pledged for State and Local Government public deposits, Amortized Cost	145,472
Securities pledged for Interest Rate Swap Counterparties, Amortized Cost	24,280
Securities pledged for Repurchase Agreements, Amortized Cost	137,045
Pledged Financial Instruments, Not Separately Reported, Interest-bearing Deposits for Other Debt Facilities, Amortized Cost	1,681
Total pledged securities, Amortized Cost	308,478
Securities pledged for State and Local Government Public Deposits, Fair Value	147,942
Securities pledged for Interest Rate Swap Counterparties, Fair Value	24,138
Securities pledged for Retail Repurchase Agreements, Fair Value	136,799
Pledged Financial Instruments, Not Separately Reported, Interest-bearing Deposits for Other Debt Facilities, Fair Value	1,673
Total pledged securities, Fair Value	$ 310,552