SECURITIES - Summary of Available For Sale Securities With Unrealized And Unrecognized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Losses less than 12 Months	$ 79,370	$ 99,545
Fair Value, Losses 12 Months or More	6,106	26,009
Fair Value, Total	85,476	125,554
Unrealized Losses, Losses less than 12 Months	673	713
Unrealized Losses, Losses 12 Months or More	44	210
Unrealized Losses, Total	717	923
U.S Treasury
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Losses less than 12 Months	0	4,894
Fair Value, Losses 12 Months or More	0
Fair Value, Total	0	4,894
Unrealized Losses, Losses less than 12 Months	0	73
Unrealized Losses, Losses 12 Months or More	0
Unrealized Losses, Total	0	73
Obligations of U.S. government agencies and sponsored entities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Losses less than 12 Months	7,695	22,987
Fair Value, Losses 12 Months or More	366
Fair Value, Total	8,061	22,987
Unrealized Losses, Losses less than 12 Months	26	224
Unrealized Losses, Losses 12 Months or More	2
Unrealized Losses, Total	28	224
Tax-exempt and taxable obligations of states and municipal subdivisions
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Losses less than 12 Months	35,175	27,913
Fair Value, Losses 12 Months or More	0	322
Fair Value, Total	35,175	28,235
Unrealized Losses, Losses less than 12 Months	593	146
Unrealized Losses, Losses 12 Months or More	0	1
Unrealized Losses, Total	593	147
Mortgage-backed securities - residential
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Losses less than 12 Months	3,345	22,328
Fair Value, Losses 12 Months or More	11	7,602
Fair Value, Total	3,356	29,930
Unrealized Losses, Losses less than 12 Months	16	55
Unrealized Losses, Losses 12 Months or More	0	52
Unrealized Losses, Total	16	107
Mortgage-backed securities - commercial
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Losses less than 12 Months	28,549	10,787
Fair Value, Losses 12 Months or More	5,690	17,649
Fair Value, Total	34,239	28,436
Unrealized Losses, Losses less than 12 Months	5	166
Unrealized Losses, Losses 12 Months or More	33	57
Unrealized Losses, Total	38	223
Corporate obligations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Losses less than 12 Months	4,606	10,636
Fair Value, Losses 12 Months or More	39	436
Fair Value, Total	4,645	11,072
Unrealized Losses, Losses less than 12 Months	33	49
Unrealized Losses, Losses 12 Months or More	9	100
Unrealized Losses, Total	$ 42	$ 149