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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale
Amortized Cost	$ 952,144	$ 938,360
Gross Unrealized Gains	42	12,796
Gross Unrealized Losses	(98,446)	(8,988)
Fair Value	853,740	942,168
Held-to-maturity
Amortized Cost	546,694	336,185
Gross Unrealized Gains	50	2,796
Gross Unrealized Losses	(65,052)	(2,954)
Fair Value	481,692	336,027
Total Amortized Cost	1,498,838	1,274,545
Total Gross Unrealized Gains	92	15,592
Total Gross Unrealized Losses	(163,498)	(11,942)
Total Fair Value	1,335,432	1,278,195
U.S. Treasury
Available-for-sale
Amortized Cost	169,895	109,002
Gross Unrealized Gains		328
Gross Unrealized Losses	(16,323)	(354)
Fair Value	153,572	108,976
U.S. government agency
Available-for-sale
Amortized Cost	61,428	129,269
Gross Unrealized Gains	1	1,303
Gross Unrealized Losses	(4,406)	(2,467)
Fair Value	57,023	128,105
Held-to-maturity
Amortized Cost	88,418	12,349
Gross Unrealized Gains		42
Gross Unrealized Losses	(10,342)	(51)
Fair Value	78,076	12,340
Municipal securities
Available-for-sale
Amortized Cost	279,711	293,837
Gross Unrealized Gains	4	6,144
Gross Unrealized Losses	(37,804)	(2,904)
Fair Value	241,911	297,077
Held-to-maturity
Amortized Cost	42,844	15,666
Gross Unrealized Gains	50	809
Gross Unrealized Losses	(1,357)
Fair Value	41,537	16,475
Mortgage-backed: Agency residential
Available-for-sale
Amortized Cost	223,738	178,236
Gross Unrealized Gains	20	2,149
Gross Unrealized Losses	(18,851)	(919)
Fair Value	204,907	179,466
Held-to-maturity
Amortized Cost	105,330	20,555
Gross Unrealized Gains		196
Gross Unrealized Losses	(6,491)	(102)
Fair Value	98,839	20,649
Mortgage-backed: Agency commercial
Available-for-sale
Amortized Cost	154,677	164,875
Gross Unrealized Gains	1	1,234
Gross Unrealized Losses	(17,302)	(2,048)
Fair Value	137,376	164,061
Held-to-maturity
Amortized Cost	310,102	287,615
Gross Unrealized Gains		1,749
Gross Unrealized Losses	(46,862)	(2,801)
Fair Value	263,240	286,563
Corporate
Available-for-sale
Amortized Cost	62,695	63,141
Gross Unrealized Gains	16	1,638
Gross Unrealized Losses	(3,760)	(296)
Fair Value	$ 58,951	$ 64,483

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