SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Amortized Cost	$ 612,408	$ 571,977
Gross Unrealized Gains	12,980	14,637
Gross Unrealized Losses	(3,539)	(1,568)
Fair Value	621,849	585,046
US Government-sponsored enterprises
Investment Holdings [Line Items]
Amortized Cost	196,476	206,834
Gross Unrealized Gains	4,001	6,018
Gross Unrealized Losses	(2,116)	(462)
Fair Value	198,361	212,390
US Government agency
Investment Holdings [Line Items]
Amortized Cost	64,693	82,878
Gross Unrealized Gains	1,853	2,870
Gross Unrealized Losses	(203)	(116)
Fair Value	66,343	85,632
Private label
Investment Holdings [Line Items]
Amortized Cost	73,428	19,810
Gross Unrealized Gains	195	40
Gross Unrealized Losses	(88)	(141)
Fair Value	73,535	19,709
Obligations of states and political subdivisions thereof
Investment Holdings [Line Items]
Amortized Cost	184,229	164,766
Gross Unrealized Gains	4,196	4,244
Gross Unrealized Losses	(272)	(6)
Fair Value	188,153	169,004
Corporate bonds
Investment Holdings [Line Items]
Amortized Cost	93,582	97,689
Gross Unrealized Gains	2,735	1,465
Gross Unrealized Losses	(860)	(843)
Fair Value	$ 95,457	$ 98,311

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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Amortized cost of 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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