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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment Holdings [Line Items]
Amortized Cost	$ 571,977	$ 655,980
Gross Unrealized Gains	14,637	11,113
Gross Unrealized Losses	(1,568)	(3,863)
Fair Value	585,046	663,230
US Government-sponsored enterprises
Investment Holdings [Line Items]
Amortized Cost	206,834	319,064
Gross Unrealized Gains	6,018	4,985
Gross Unrealized Losses	(462)	(2,080)
Fair Value	212,390	321,969
US Government agency
Investment Holdings [Line Items]
Amortized Cost	82,878	98,568
Gross Unrealized Gains	2,870	1,640
Gross Unrealized Losses	(116)	(547)
Fair Value	85,632	99,661
Private label
Investment Holdings [Line Items]
Amortized Cost	19,810	20,212
Gross Unrealized Gains	40	68
Gross Unrealized Losses	(141)	(747)
Fair Value	19,709	19,533
Obligations of states and political subdivisions thereof
Investment Holdings [Line Items]
Amortized Cost	164,766	139,332
Gross Unrealized Gains	4,244	2,942
Gross Unrealized Losses	(6)	(268)
Fair Value	169,004	142,006
Corporate bonds
Investment Holdings [Line Items]
Amortized Cost	97,689	78,804
Gross Unrealized Gains	1,465	1,478
Gross Unrealized Losses	(843)	(221)
Fair Value	$ 98,311	$ 80,061

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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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