INVESTMENT SECURITIES HELD TO MATURITY - Classified (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 78,672	$ 87,521
Fair value	81,952	92,816
State and municipal securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	78,672	87,521
Gross unrealized gains	3,517	5,364
Gross unrealized losses	237	69
Fair value	$ 81,952	$ 92,816