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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	$ 655,888	$ 737,141
Unrealized Gains	11,205	2,871
Unrealized Losses	(3,863)	(14,175)
Fair Value	663,230	725,837
US Government-sponsored enterprises
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	319,064	413,492
Unrealized Gains	4,985	904
Unrealized Losses	(2,080)	(9,444)
Fair Value	321,969	404,952
US Government agency
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	98,568	111,938
Unrealized Gains	1,640	509
Unrealized Losses	(547)	(1,935)
Fair Value	99,661	110,512
Private label
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	20,212	20,353
Unrealized Gains	68	113
Unrealized Losses	(747)	(84)
Fair Value	19,533	20,382
Obligations of states and political subdivisions thereof
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	139,240	133,260
Unrealized Gains	3,034	1,081
Unrealized Losses	(268)	(2,076)
Fair Value	142,006	132,265
Corporate bonds
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Amortized Cost	78,804	58,098
Unrealized Gains	1,478	264
Unrealized Losses	(221)	(636)
Fair Value	$ 80,061	$ 57,726

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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