INVESTMENT SECURITIES, Amortized Cost, Maturities and Approximate Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Amortized Cost [Abstract]
Due in one year or less	$ 21,694		$ 21,694
Due from one to five years	134,731		134,731
Due from five to ten years	52,618		52,618
Total securities available for sale	209,043		209,043		$ 244,706
Fair Value [Abstract]
Due in one year or less	21,979		21,979
Due from one to five years	139,477		139,477
Due from five to ten years	53,655		53,655
Total securities available for sale	215,111		215,111		247,099
Amortized Cost [Abstract]
Due in one year or less	2,586		2,586
Due from one to five years	1,624		1,624
Due from five to ten years	14,126		14,126
Due after ten years	11,130		11,130
Amortized Cost	29,466		29,466		61,309
Fair Value [Abstract]
Due in one year or less	2,699		2,699
Due from one to five years	1,693		1,693
Due from five to ten years	14,672		14,672
Due after ten years	11,947		11,947
Total securities held to maturity	31,011		31,011		63,272
Total Amortized Cost	238,509		238,509		306,015
Total Fair Value	246,122		246,122		310,371
Contingent liability from counterparty estimated future exposure from Visa litigation	752		752		752
Approximate cash payment per quarter for Visa litigation	82	$ 71	156	$ 141
US Government agency securities held as available-for-sale pledged as collateral	$ 3,000		$ 3,000		$ 3,000
Shares of Visa Class B securities held (in shares)	38,638		38,638		38,638