INVESTMENT SECURITIES, Contractual and Expected Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Maturity in years [Abstract]
Due in one year or less	$ 27,624
Due after one year through five years	51,047
Due after five years through ten years	4,041
Due after ten years	0
Subtotal	82,712
MBS & CMO	215,202
Amortized cost	297,914	$ 284,947
Maturity in years [Abstract]
Due in one year or less	27,548
Due after one year through five years	50,402
Due after five years through ten years	4,157
Due after ten years	0
Subtotal	82,107
MBS & CMO	209,059
Estimated fair value	$ 291,166	$ 280,741