BORROWINGS Repurchase Agreements (Details) - Maturity Overnight [Member] - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Assets Sold under Agreements to Repurchase [Line Items]
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement	[1]	$ 162,679	$ 176,913
U.S. Government agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement		16,867	20,233
Agency mortgage-backed securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement		51,273	79,079
Collateralized Mortgage Backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement		$ 94,539	$ 77,601

[1] All customer repurchase agreements have an overnight and continuous maturity date.