INVESTMENT SECURITIES - Contractual Maturities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Securities available for sale:
Due in one year or less, Amortized cost	$ 30,365	$ 677
Due from one to five years, Amortized cost	294,557	182,777
Due from five to ten years, Amortized cost	313,733	173,624
Due after ten years, Amortized cost	32,484	57,296
Equity Securities, Amortized cost	3,017	677
Amortized Cost	674,156	415,051
Due in one year or less, Fair value	30,536	678
Due from one to five years, Fair value	295,252	182,713
Due from five to ten years, Fair value	311,313	166,765
Due after ten years, Fair value	32,455	53,189
Equity Securities, Fair value	2,865	1,043
Fair Value	672,421	404,388
Securities held to maturity:
Due after one year through five years, Amortized Cost	20,177	500
Due after five years through ten years, Amortized Cost	15,836	0
Due after ten years, Amortized Cost	3,607	0
Amortized Cost	39,620	500
Due after one year through five years, Fair Value	20,747	500
Due after five years through ten years, Fair Value	16,092	0
Due after ten years, Fair Value	3,747	0
Fair Value	$ 40,586	$ 500