SECURITIES, By Contractual Maturity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Amortized cost of available-for-sale securities by contractual maturity [Abstract]
Due in one year or less	$ 6,795
Due after one year through five years	19,152
Due after five years through ten years	8,490
Due after ten years	4,424
Amortized cost	368,354		$ 370,607
Fair value of available-for-sale securities by contractual maturity [Abstract]
Due in one year or less	6,762
Due after one year through five years	19,352
Due after five years through ten years	8,751
Due after ten years	4,642
Fair value	369,082		365,731
Proceeds from the sale of securities	0	$ 0
Corporate Preferred Securities [Member]
Amortized cost of available-for-sale securities by contractual maturity [Abstract]
Without single maturity date	500
Fair value of available-for-sale securities by contractual maturity [Abstract]
Without single maturity date	500
Mortgage-backed Securities of Government Sponsored Enterprises [Member]
Amortized cost of available-for-sale securities by contractual maturity [Abstract]
Without single maturity date	328,993
Amortized cost	328,993		328,806
Fair value of available-for-sale securities by contractual maturity [Abstract]
Without single maturity date	329,075
Fair value	$ 329,075		$ 323,785