SECURITIES - Investment Securities Available for Sale in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]
Less than 12 months	$ 3,353	$ 17,100
12 months or longer	69,171	201,005
Total	72,524	218,105
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]
Less than 12 months	1	57
12 months or longer	420	6,407
Total	421	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
12 months or longer		4,969
Total		4,969
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]
Less than 12 months		0
12 months or longer		27
Total		27
Mortgage-backed securities, residential
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]
Less than 12 months	0	0
12 months or longer	67,646	171,481
Total	67,646	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	385	6,065
Total	385	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		10,868
12 months or longer		21,345
Total		32,213
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]
Less than 12 months		38
12 months or longer		270
Total		308
Corporate Bonds and Notes
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]
Less than 12 months		247
12 months or longer		0
Total		247
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]
Less than 12 months		2
12 months or longer		0
Total		2
SBA loan pools
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]
Less than 12 months	3,353	5,985
12 months or longer	1,525	3,210
Total	4,878	9,195
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]
Less than 12 months	1	17
12 months or longer	35	45
Total	$ 36	$ 62