REPURCHASE AGREEMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets Sold under Agreements to Repurchase [Line Items]
Certificates of Deposit, at Carrying Value	$ 919	$ 917
Repurchase Agreements	265,627	230,612
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	265,627	225,605
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	5,007
Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
Wholesale Customer
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	5,007
Wholesale Customer | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
Wholesale Customer | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
Wholesale Customer | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	5,007
Wholesale Customer | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
Wholesale Customer | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements		3,715
Wholesale Customer | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements		0
Wholesale Customer | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements		0
Wholesale Customer | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements		3,715
Wholesale Customer | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements		0
Wholesale Customer | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements		1,292
Wholesale Customer | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements		0
Wholesale Customer | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements		0
Wholesale Customer | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements		1,292
Wholesale Customer | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements		0
Retail Customers
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	265,627	225,605
Retail Customers | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	265,627	225,605
Retail Customers | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
Retail Customers | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
Retail Customers | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
Retail Customers | Obligations of states and political subdivisions
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	451
Retail Customers | Obligations of states and political subdivisions | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	451
Retail Customers | Obligations of states and political subdivisions | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0
Retail Customers | Obligations of states and political subdivisions | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0
Retail Customers | Obligations of states and political subdivisions | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0
Retail Customers | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	168,103	117,784
Retail Customers | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	168,103	117,784
Retail Customers | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
Retail Customers | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
Retail Customers | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
Retail Customers | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	97,073	107,821
Retail Customers | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	97,073	107,821
Retail Customers | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
Retail Customers | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	0	0
Retail Customers | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	$ 0	$ 0