INVESTMENT SECURITIES - Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Securities available for sale:
Due in one year or less, Amortized cost	$ 66,591	$ 30,365
Due from one to five years, Amortized cost	291,298	294,557
Due from five to ten years, Amortized cost	309,625	313,733
Due after ten years, Amortized cost	24,616	32,484
Equity Securities, Amortized cost	2,381	3,017
Amortized Cost	694,511	674,156
Due in one year or less, Fair value	67,163	30,536
Due from one to five years, Fair value	289,525	295,252
Due from five to ten years, Fair value	306,420	311,313
Due after ten years, Fair value	24,398	32,455
Equity Securities, Fair value	1,626	2,865
Fair Value	689,132	672,421
Securities held to maturity:
Due after one year through five years, Amortized Cost	31,421	20,177
Due after five years through ten years, Amortized Cost	4,072	15,836
Due after ten years, Amortized Cost	3,689	3,607
Amortized Cost	39,182	39,620
Due after one year through five years, Fair Value	32,272	20,747
Due after five years through ten years, Fair Value	4,229	16,092
Due after ten years, Fair Value	3,999	3,747
Fair Value	$ 40,500	$ 40,586