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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale
Amortized Cost	$ 851,299	$ 899,700
Gross Unrealized Gains	17,441	24,260
Gross Unrealized Losses	(11,905)	(1,091)
Fair Value	856,835	922,869
Held-to-maturity
Amortized Cost	192,994	68,395
Gross Unrealized Gains	2,899	4,064
Gross Unrealized Losses	(285)	(18)
Fair Value	195,608	72,441
Total Amortized Cost	1,044,293	968,095
Total Gross Unrealized Gains	20,340	28,324
Total Gross Unrealized Losses	(12,190)	(1,109)
Total Fair Value	1,052,443	995,310
U.S. government agency
Available-for-sale
Amortized Cost	129,494	118,282
Gross Unrealized Gains	1,785	3,720
Gross Unrealized Losses	(3,341)	(9)
Fair Value	127,938	121,993
Held-to-maturity
Amortized Cost	7,323
Fair Value	7,323
Municipal
Available-for-sale
Amortized Cost	280,212	265,309
Gross Unrealized Gains	6,479	9,232
Gross Unrealized Losses	(4,358)	(280)
Fair Value	282,333	274,261
Held-to-maturity
Amortized Cost	21,067	22,484
Gross Unrealized Gains	1,188	1,390
Fair Value	22,255	23,874
Mortgage-backed: Agency residential
Available-for-sale
Amortized Cost	164,942	198,543
Gross Unrealized Gains	4,366	4,871
Gross Unrealized Losses	(204)	(162)
Fair Value	169,104	203,252
Held-to-maturity
Amortized Cost	20,335	13,031
Gross Unrealized Gains	388	452
Fair Value	20,723	13,483
Mortgage-backed: Agency commercial
Available-for-sale
Amortized Cost	208,692	246,649
Gross Unrealized Gains	2,861	4,651
Gross Unrealized Losses	(3,556)	(534)
Fair Value	207,997	250,766
Held-to-maturity
Amortized Cost	144,269	32,880
Gross Unrealized Gains	1,323	2,222
Gross Unrealized Losses	(285)	(18)
Fair Value	145,307	35,084
Corporate
Available-for-sale
Amortized Cost	67,959	70,917
Gross Unrealized Gains	1,950	1,786
Gross Unrealized Losses	(446)	(106)
Fair Value	$ 69,463	$ 72,597

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