INVESTMENT SECURITIES - Narrative (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Number of private-label collateralized mortgage obligations | security	2
Combined balance of private-label collateralized mortgage obligations	$ 18,000	$ 27,000
Number of securities in unrealized loss positions | security	80
Unrealized losses as a percentage of individual securities, amortized cost basis	1.93%
Unrealized losses as percentage of Company's total amortized cost basis	1.29%
Number of securities in an unrealized loss position for more than 12 months | security	10
Amortized cost basis of securities in a continuous loss position	$ 25,800,000
Unrealized loss on securities in a continuous loss position	879,000
Impairment related to credit quality	$ 0
Number of available-for-sale securities sold | security		22
Available-for-sale Securities, Gross Realized Gain (Loss)		$ 1,200,000
Number of available-for-sale securities sold with gains | security	2	12
Available-for-sale securities, total gains	$ 20,000	$ 1,400,000
Number of available-for-sale securities sold with loss | security		10
Available-for-sale securities sold at a loss		$ 135,000
Securities pledged as collateral for public funding	$ 293,400,000	$ 285,400,000