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SECURITIES - Summary of Available for Sale Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Available for sale:
Amortized Cost	$ 528,782	$ 639,463
Gross Unrealized Gains	11,597	4,225
Gross Unrealized Losses	(2,633)	(5,397)
Estimated Fair Value	537,746	638,291
U.S. Treasury securities
Available for sale:
Amortized Cost	49,999	50,833
Gross Unrealized Losses		(11)
Estimated Fair Value	49,999	50,822
U.S. GSE securities
Available for sale:
Amortized Cost		5,000
Gross Unrealized Losses		(5)
Estimated Fair Value		4,995
State and municipal obligations
Available for sale:
Amortized Cost	36,009	34,303
Gross Unrealized Gains	1,470	704
Gross Unrealized Losses		(43)
Estimated Fair Value	37,479	34,964
U.S. GSE residential mortgage-backed securities
Available for sale:
Amortized Cost	75,298	84,550
Gross Unrealized Gains	2,489	609
Gross Unrealized Losses	(10)	(468)
Estimated Fair Value	77,777	84,691
U.S. GSE residential collateralized mortgage obligations
Available for sale:
Amortized Cost	179,542	278,149
Gross Unrealized Gains	3,089	1,166
Gross Unrealized Losses	(80)	(1,464)
Estimated Fair Value	182,551	277,851
U.S. GSE commercial mortgage-backed securities
Available for sale:
Amortized Cost	16,611	13,656
Gross Unrealized Gains	305	23
Gross Unrealized Losses	0	(70)
Estimated Fair Value	16,916	13,609
U.S. GSE commercial collateralized mortgage obligations
Available for sale:
Amortized Cost	98,073	102,722
Gross Unrealized Gains	4,194	1,723
Gross Unrealized Losses	(66)	(289)
Estimated Fair Value	102,201	104,156
Other asset backed securities
Available for sale:
Amortized Cost	24,250	24,250
Gross Unrealized Gains	0
Gross Unrealized Losses	(375)	(849)
Estimated Fair Value	23,875	23,401
Corporate bonds
Available for sale:
Amortized Cost	49,000	46,000
Gross Unrealized Gains	50
Gross Unrealized Losses	(2,102)	(2,198)
Estimated Fair Value	$ 46,948	$ 43,802

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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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