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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available-for-sale:
Amortized Cost	$ 740,056	$ 831,624
Gross Unrealized Gains	54	99
Gross Unrealized Losses	(71,090)	(72,262)
Allowance for Credit Losses	0	0
Fair Value	669,020	759,461
Held-to-maturity
Amortized Cost	517,472	521,439
Gross Unrealized Gains	158	394
Gross Unrealized Losses	(58,990)	(55,337)
Fair Value	458,640	466,496
Allowance for Credit Losses	0	0
U.S. Treasury
Available-for-sale:
Amortized Cost	149,697	159,715
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(11,511)	(11,093)
Allowance for Credit Losses	0	0
Fair Value	138,186	148,622
U.S. government agency
Available-for-sale:
Amortized Cost	53,836	55,359
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,377)	(3,262)
Allowance for Credit Losses	0	0
Fair Value	50,459	52,097
Held-to-maturity
Amortized Cost	88,454	88,448
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(8,977)	(8,292)
Fair Value	79,477	80,156
Allowance for Credit Losses	0	0
Municipal
Available-for-sale:
Amortized Cost	156,403	229,030
Gross Unrealized Gains	1	26
Gross Unrealized Losses	(21,756)	(23,499)
Allowance for Credit Losses	0	0
Fair Value	134,648	205,557
Held-to-maturity
Amortized Cost	38,459	38,442
Gross Unrealized Gains	158	394
Gross Unrealized Losses	(351)	(163)
Fair Value	38,266	38,673
Allowance for Credit Losses	0	0
Agency residential
Available-for-sale:
Amortized Cost	183,553	188,641
Gross Unrealized Gains	51	61
Gross Unrealized Losses	(15,058)	(14,718)
Allowance for Credit Losses	0	0
Fair Value	168,546	173,984
Held-to-maturity
Amortized Cost	93,737	95,828
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6,497)	(5,569)
Fair Value	87,240	90,259
Allowance for Credit Losses	0	0
Agency commercial
Available-for-sale:
Amortized Cost	138,873	141,214
Gross Unrealized Gains	2	3
Gross Unrealized Losses	(14,400)	(14,205)
Allowance for Credit Losses	0	0
Fair Value	124,475	127,012
Held-to-maturity
Amortized Cost	296,822	298,721
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(43,165)	(41,313)
Fair Value	253,657	257,408
Allowance for Credit Losses	0	0
Corporate
Available-for-sale:
Amortized Cost	57,694	57,665
Gross Unrealized Gains	0	9
Gross Unrealized Losses	(4,988)	(5,485)
Allowance for Credit Losses	0	0
Fair Value	$ 52,706	$ 52,189

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