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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale
Amortized cost	$ 933,104	$ 934,456
Gross Unrealized Gains	138	106
Gross Unrealized Losses	(78,020)	(91,038)
Allowance for credit losses	(600)
Fair Value	854,622	843,524
Held-to-maturity
Amortized Cost	536,429	541,600
Gross Unrealized Gains	426	195
Gross Unrealized Losses	(54,930)	(62,994)
Fair Value	481,925	478,801
U.S. Treasury
Available-for-sale
Amortized cost	169,824	169,860
Gross Unrealized Losses	(12,804)	(15,345)
Fair Value	157,020	154,515
U.S. government agency
Available-for-sale
Amortized cost	57,111	59,291
Gross Unrealized Losses	(3,413)	(4,134)
Fair Value	53,698	55,157
Held-to-maturity
Amortized Cost	88,430	88,424
Gross Unrealized Losses	(8,257)	(9,728)
Fair Value	80,173	78,696
Municipal securities
Available-for-sale
Amortized cost	274,849	275,972
Gross Unrealized Gains	114	46
Gross Unrealized Losses	(26,079)	(32,189)
Fair Value	248,884	243,829
Held-to-maturity
Amortized Cost	41,121	42,167
Gross Unrealized Gains	426	195
Gross Unrealized Losses	(128)	(314)
Fair Value	41,419	42,048
Mortgage-backed: Agency residential
Available-for-sale
Amortized cost	218,509	213,676
Gross Unrealized Gains	20	5
Gross Unrealized Losses	(16,553)	(18,240)
Fair Value	201,976	195,441
Held-to-maturity
Amortized Cost	100,500	102,728
Gross Unrealized Losses	(5,275)	(6,470)
Fair Value	95,225	96,258
Mortgage-backed: Agency commercial
Available-for-sale
Amortized cost	150,195	150,060
Gross Unrealized Gains	4
Gross Unrealized Losses	(15,190)	(17,172)
Fair Value	135,009	132,888
Held-to-maturity
Amortized Cost	306,378	308,281
Gross Unrealized Losses	(41,270)	(46,482)
Fair Value	265,108	261,799
Corporate
Available-for-sale
Amortized cost	62,616	65,597
Gross Unrealized Gains		55
Gross Unrealized Losses	(3,981)	(3,958)
Allowance for credit losses	(600)
Fair Value	$ 58,035	$ 61,694

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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