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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Available-for-sale
Amortized Cost	$ 821,935	$ 899,700
Gross Unrealized Gains	18,850	24,260
Gross Unrealized Losses	(4,518)	(1,091)
Fair Value	836,267	922,869
Held-to-maturity
Amortized Cost	309,132	68,395
Gross Unrealized Gains	5,941	4,064
Gross Unrealized Losses	(149)	(18)
Fair Value	314,924	72,441
Total Amortized Cost	1,131,067	968,095
Total Gross Unrealized Gains	24,791	28,324
Total Gross Unrealized Losses	(4,667)	(1,109)
Total Fair Value	1,151,191	995,310
U.S. Treasury
Available-for-sale
Amortized Cost	59,941
Gross Unrealized Gains	652
Fair Value	60,593
U.S. government agency
Available-for-sale
Amortized Cost	129,100	118,282
Gross Unrealized Gains	2,311	3,720
Gross Unrealized Losses	(1,539)	(9)
Fair Value	129,872	121,993
Held-to-maturity
Amortized Cost	7,332
Gross Unrealized Gains	153
Fair Value	7,485
Municipal
Available-for-sale
Amortized Cost	286,070	265,309
Gross Unrealized Gains	7,271	9,232
Gross Unrealized Losses	(2,090)	(280)
Fair Value	291,251	274,261
Held-to-maturity
Amortized Cost	19,174	22,484
Gross Unrealized Gains	1,116	1,390
Fair Value	20,290	23,874
Mortgage-backed: Agency residential
Available-for-sale
Amortized Cost	143,657	198,543
Gross Unrealized Gains	3,626	4,871
Gross Unrealized Losses	(136)	(162)
Fair Value	147,147	203,252
Held-to-maturity
Amortized Cost	24,063	13,031
Gross Unrealized Gains	504	452
Fair Value	24,567	13,483
Mortgage-backed: Agency commercial
Available-for-sale
Amortized Cost	131,172	246,649
Gross Unrealized Gains	2,755	4,651
Gross Unrealized Losses	(487)	(534)
Fair Value	133,440	250,766
Held-to-maturity
Amortized Cost	258,563	32,880
Gross Unrealized Gains	4,168	2,222
Gross Unrealized Losses	(149)	(18)
Fair Value	262,582	35,084
Corporate
Available-for-sale
Amortized Cost	71,995	70,917
Gross Unrealized Gains	2,235	1,786
Gross Unrealized Losses	(266)	(106)
Fair Value	$ 73,964	$ 72,597

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