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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale
Amortized Cost	$ 934,456	$ 938,360
Gross Unrealized Gains	106	12,796
Gross Unrealized Losses	(91,038)	(8,988)
Fair Value	843,524	942,168
Held-to-maturity
Amortized Cost	541,600	336,185
Gross Unrealized Gains	195	2,796
Gross Unrealized Losses	(62,994)	(2,954)
Fair Value	478,801	336,027
Total Amortized Cost	1,476,056	1,274,545
Total Gross Unrealized Gains	301	15,592
Total Gross Unrealized Losses	(154,032)	(11,942)
Total Fair Value	1,322,325	1,278,195
U.S. Treasury
Available-for-sale
Amortized Cost	169,860	109,002
Gross Unrealized Gains		328
Gross Unrealized Losses	(15,345)	(354)
Fair Value	154,515	108,976
U.S. government agency
Available-for-sale
Amortized Cost	59,291	129,269
Gross Unrealized Gains		1,303
Gross Unrealized Losses	(4,134)	(2,467)
Fair Value	55,157	128,105
Held-to-maturity
Amortized Cost	88,424	12,349
Gross Unrealized Gains		42
Gross Unrealized Losses	(9,728)	(51)
Fair Value	78,696	12,340
Municipal securities
Available-for-sale
Amortized Cost	275,972	293,837
Gross Unrealized Gains	46	6,144
Gross Unrealized Losses	(32,189)	(2,904)
Fair Value	243,829	297,077
Held-to-maturity
Amortized Cost	42,167	15,666
Gross Unrealized Gains	195	809
Gross Unrealized Losses	(314)
Fair Value	42,048	16,475
Mortgage-backed: Agency residential
Available-for-sale
Amortized Cost	213,676	178,236
Gross Unrealized Gains	5	2,149
Gross Unrealized Losses	(18,240)	(919)
Fair Value	195,441	179,466
Held-to-maturity
Amortized Cost	102,728	20,555
Gross Unrealized Gains		196
Gross Unrealized Losses	(6,470)	(102)
Fair Value	96,258	20,649
Mortgage-backed: Agency commercial
Available-for-sale
Amortized Cost	150,060	164,875
Gross Unrealized Gains		1,234
Gross Unrealized Losses	(17,172)	(2,048)
Fair Value	132,888	164,061
Held-to-maturity
Amortized Cost	308,281	287,615
Gross Unrealized Gains		1,749
Gross Unrealized Losses	(46,482)	(2,801)
Fair Value	261,799	286,563
Corporate
Available-for-sale
Amortized Cost	65,597	63,141
Gross Unrealized Gains	55	1,638
Gross Unrealized Losses	(3,958)	(296)
Fair Value	$ 61,694	$ 64,483

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