SECURITIES - Investment Securities Available for Sale in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]
Less than 12 months	$ 17,955	$ 17,100
12 months or longer	170,999	201,005
Total	188,954	218,105
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]
Less than 12 months	19	57
12 months or longer	3,700	6,407
Total	3,719	6,464
Obligations of U.S. Government and U.S. Government sponsored enterprises
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]
Less than 12 months	0	0
12 months or longer	4,984	4,969
Total	4,984	4,969
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]
Less than 12 months	0	0
12 months or longer	13	27
Total	13	27
Mortgage-backed securities, residential
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]
Less than 12 months	10,651	0
12 months or longer	158,684	171,481
Total	169,335	171,481
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]
Less than 12 months	0	0
12 months or longer	3,622	6,065
Total	3,622	6,065
Obligations of states and political subdivisions
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]
Less than 12 months	1,387	10,868
12 months or longer	4,285	21,345
Total	5,672	32,213
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]
Less than 12 months	0	38
12 months or longer	20	270
Total	20	308
Corporate Bonds and Notes
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]
Less than 12 months	249	247
12 months or longer	0	0
Total	249	247
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]
Less than 12 months	1	2
12 months or longer	0	0
Total	1	2
SBA loan pools
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]
Less than 12 months	5,668	5,985
12 months or longer	3,046	3,210
Total	8,714	9,195
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]
Less than 12 months	18	17
12 months or longer	45	45
Total	$ 63	$ 62