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Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investment securities available-for-sale
Amortized Cost	$ 833,140	$ 849,567
Unrealized Gains	16	21
Unrealized Losses	(127,331)	(132,264)
Fair Value	705,825	717,324
Amortized Cost	313,871	321,902
Unrealized Losses	(45,997)	(50,990)
Allowance for Credit Losses	223
Fair Value	267,874	270,912
Amortized Cost	1,147,011	1,171,469
Unrealized Gains	16	21
Unrealized Losses	(173,328)	(183,254)
Allowance for Credit Losses	223
Fair Value	973,699	988,236
Available-for-Sale accrued interest receivable	2,200	1,900
Held-to-Maturity accrued interest receivable	1,000	1,500
U. S. Treasury and agencies
Investment securities available-for-sale
Amortized Cost	3,264	3,518
Unrealized Gains	15	19
Unrealized Losses	(12)	(17)
Fair Value	3,267	3,520
Mortgage backed securities - Residential agency
Investment securities available-for-sale
Amortized Cost	691,334	705,845
Unrealized Gains	1	2
Unrealized Losses	(109,716)	(118,168)
Fair Value	581,619	587,679
Amortized Cost	181,438	184,115
Unrealized Losses	(31,848)	(33,254)
Allowance for Credit Losses	106
Fair Value	149,590	150,861
Mortgage backed securities - Commercial
Investment securities available-for-sale
Amortized Cost	69,011	70,669
Unrealized Losses	(6,240)	(7,111)
Fair Value	62,771	63,558
Asset backed securities
Investment securities available-for-sale
Amortized Cost	32	34
Fair Value	32	34
Corporate bonds
Investment securities available-for-sale
Amortized Cost	69,499	69,501
Unrealized Losses	(11,363)	(6,968)
Fair Value	58,136	62,533
Obligations of state and political agencies.
Investment securities available-for-sale
Amortized Cost	132,433	137,787
Unrealized Losses	(14,149)	(17,736)
Allowance for Credit Losses	117
Fair Value	$ 118,284	$ 120,051

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