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, 2022	Dec. 31, 2021
Available-for-sale
Amortized Cost	$ 972,817	$ 938,360
Gross Unrealized Gains	2,004	12,796
Gross Unrealized Losses	(40,899)	(8,988)
Fair Value	933,922	942,168
Held-to-maturity
Amortized Cost	438,054	336,185
Gross Unrealized Gains	611	2,796
Gross Unrealized Losses	(22,062)	(2,954)
Fair Value	416,603	336,027
Total Amortized Cost	1,410,871	1,274,545
Total Gross Unrealized Gains	2,615	15,592
Total Gross Unrealized Losses	(62,961)	(11,942)
Total Fair Value	1,350,525	1,278,195
U.S. Treasury
Available-for-sale
Amortized Cost	169,966	109,002
Gross Unrealized Gains		328
Gross Unrealized Losses	(7,329)	(354)
Fair Value	162,637	108,976
U.S. government agency
Available-for-sale
Amortized Cost	51,182	129,269
Gross Unrealized Gains	16	1,303
Gross Unrealized Losses	(1,181)	(2,467)
Fair Value	50,017	128,105
Held-to-maturity
Amortized Cost	83,407	12,349
Gross Unrealized Gains		42
Gross Unrealized Losses	(722)	(51)
Fair Value	82,685	12,340
Municipal securities
Available-for-sale
Amortized Cost	290,714	293,837
Gross Unrealized Gains	603	6,144
Gross Unrealized Losses	(15,753)	(2,904)
Fair Value	275,564	297,077
Held-to-maturity
Amortized Cost	14,251	15,666
Gross Unrealized Gains	350	809
Fair Value	14,601	16,475
Mortgage-backed: Agency residential
Available-for-sale
Amortized Cost	244,721	178,236
Gross Unrealized Gains	604	2,149
Gross Unrealized Losses	(7,797)	(919)
Fair Value	237,528	179,466
Held-to-maturity
Amortized Cost	27,100	20,555
Gross Unrealized Gains	7	196
Gross Unrealized Losses	(947)	(102)
Fair Value	26,160	20,649
Mortgage-backed: Agency commercial
Available-for-sale
Amortized Cost	156,806	164,875
Gross Unrealized Gains	124	1,234
Gross Unrealized Losses	(7,619)	(2,048)
Fair Value	149,311	164,061
Held-to-maturity
Amortized Cost	313,296	287,615
Gross Unrealized Gains	254	1,749
Gross Unrealized Losses	(20,393)	(2,801)
Fair Value	293,157	286,563
Corporate
Available-for-sale
Amortized Cost	59,428	63,141
Gross Unrealized Gains	657	1,638
Gross Unrealized Losses	(1,220)	(296)
Fair Value	$ 58,865	$ 64,483

Debt Securities Available For Sale And Held To Maturity Amortized Cost

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Amount of accumulated unrecognized gain on investment in debt security available for sale and held to maturity at amortized cost.

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