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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, 2022	Dec. 31, 2021
Available-for-sale
Amortized Cost	$ 987,752	$ 938,360
Gross Unrealized Gains	572	12,796
Gross Unrealized Losses	(63,618)	(8,988)
Fair Value	924,706	942,168
Held-to-maturity
Amortized Cost	548,236	336,185
Gross Unrealized Gains	697	2,796
Gross Unrealized Losses	(38,781)	(2,954)
Fair Value	510,152	336,027
Total Amortized Cost	1,535,988	1,274,545
Total Gross Unrealized Gains	1,269	15,592
Total Gross Unrealized Losses	(102,399)	(11,942)
Total Fair Value	1,434,858	1,278,195
U.S. Treasury
Available-for-sale
Amortized Cost	169,930	109,002
Gross Unrealized Gains		328
Gross Unrealized Losses	(10,725)	(354)
Fair Value	159,205	108,976
U.S. government agency
Available-for-sale
Amortized Cost	60,373	129,269
Gross Unrealized Gains		1,303
Gross Unrealized Losses	(2,156)	(2,467)
Fair Value	58,217	128,105
Held-to-maturity
Amortized Cost	88,413	12,349
Gross Unrealized Gains		42
Gross Unrealized Losses	(5,364)	(51)
Fair Value	83,049	12,340
Municipal securities
Available-for-sale
Amortized Cost	286,012	293,837
Gross Unrealized Gains	190	6,144
Gross Unrealized Losses	(25,661)	(2,904)
Fair Value	260,541	297,077
Held-to-maturity
Amortized Cost	40,920	15,666
Gross Unrealized Gains	376	809
Gross Unrealized Losses	(66)
Fair Value	41,230	16,475
Mortgage-backed: Agency residential
Available-for-sale
Amortized Cost	236,516	178,236
Gross Unrealized Gains	152	2,149
Gross Unrealized Losses	(11,626)	(919)
Fair Value	225,042	179,466
Held-to-maturity
Amortized Cost	108,711	20,555
Gross Unrealized Gains	276	196
Gross Unrealized Losses	(1,971)	(102)
Fair Value	107,016	20,649
Mortgage-backed: Agency commercial
Available-for-sale
Amortized Cost	160,576	164,875
Gross Unrealized Gains	15	1,234
Gross Unrealized Losses	(11,355)	(2,048)
Fair Value	149,236	164,061
Held-to-maturity
Amortized Cost	310,192	287,615
Gross Unrealized Gains	45	1,749
Gross Unrealized Losses	(31,380)	(2,801)
Fair Value	278,857	286,563
Corporate
Available-for-sale
Amortized Cost	74,345	63,141
Gross Unrealized Gains	215	1,638
Gross Unrealized Losses	(2,095)	(296)
Fair Value	$ 72,465	$ 64,483

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