Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale securities:
Amortized Cost	$ 190,583	$ 120,832
Gross Unrealized Gains	350	69
Gross Unrealized Losses	11,437	10,380
Investment securities - AFS	179,496	110,521
Held-to-maturity securities:
Amortized Cost	503,938	513,282
Gross Unrealized Gains	44	57
Gross Unrealized Losses	59,724	55,509
Estimated Fair Value	444,258	457,830
Allowance for Credit Losses	116	94	$ 163	$ 0
U.S. Treasury and government agencies
Available-for-sale securities:
Amortized Cost	72,701	23,472
Gross Unrealized Gains	8	5
Gross Unrealized Losses	3,168	3,002
Investment securities - AFS	69,541	20,475
Held-to-maturity securities:
Amortized Cost	143,215	143,442
Gross Unrealized Gains	0	0
Gross Unrealized Losses	11,172	10,377
Estimated Fair Value	132,043	133,065
Allowance for Credit Losses	0	0
Mortgage-backed-residential
Available-for-sale securities:
Amortized Cost	111,780	91,280
Gross Unrealized Gains	20	5
Gross Unrealized Losses	8,174	7,258
Investment securities - AFS	103,626	84,027
Held-to-maturity securities:
Amortized Cost	348,754	357,870
Gross Unrealized Gains	0	0
Gross Unrealized Losses	47,343	43,864
Estimated Fair Value	301,411	314,006
Allowance for Credit Losses	0	0
Other debt securities
Available-for-sale securities:
Amortized Cost	6,102	6,080
Gross Unrealized Gains	322	59
Gross Unrealized Losses	95	120
Investment securities - AFS	6,329	6,019
Held-to-maturity securities:
Amortized Cost	10,500	10,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,185	1,249
Estimated Fair Value	9,315	9,251
Allowance for Credit Losses	116	94
States and political subdivisions
Held-to-maturity securities:
Amortized Cost	1,469	1,470
Gross Unrealized Gains	44	57
Gross Unrealized Losses	24	19
Estimated Fair Value	1,489	1,508
Allowance for Credit Losses	$ 0	$ 0

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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