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Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Available-for-sale securities:
Amortized Cost	$ 140,941		$ 120,832
Gross Unrealized Gains	568		69
Gross Unrealized Losses	8,170		10,380
Investment securities - AFS	133,339		110,521
Held-to-maturity securities:
Amortized Cost	484,684		513,282
Gross Unrealized Gains	96		57
Gross Unrealized Losses	44,484		55,509
Estimated Fair Value	440,296		457,830
Allowance for Credit Losses	101	$ 108	94	$ 126	$ 0	$ 163
U.S. Treasury and government agencies
Available-for-sale securities:
Amortized Cost	23,047		23,472
Gross Unrealized Gains	6		5
Gross Unrealized Losses	2,363		3,002
Investment securities - AFS	20,690		20,475
Held-to-maturity securities:
Amortized Cost	132,870		143,442
Gross Unrealized Gains	3		0
Gross Unrealized Losses	7,375		10,377
Estimated Fair Value	125,498		133,065
Allowance for Credit Losses	0		0
Mortgage-backed-residential
Available-for-sale securities:
Amortized Cost	111,748		91,280
Gross Unrealized Gains	234		5
Gross Unrealized Losses	5,761		7,258
Investment securities - AFS	106,221		84,027
Held-to-maturity securities:
Amortized Cost	339,848		357,870
Gross Unrealized Gains	51		0
Gross Unrealized Losses	36,293		43,864
Estimated Fair Value	303,606		314,006
Allowance for Credit Losses	0		0
Other debt securities
Available-for-sale securities:
Amortized Cost	6,146		6,080
Gross Unrealized Gains	328		59
Gross Unrealized Losses	46		120
Investment securities - AFS	6,428		6,019
Held-to-maturity securities:
Amortized Cost	10,500		10,500
Gross Unrealized Gains	0		0
Gross Unrealized Losses	807		1,249
Estimated Fair Value	9,693		9,251
Allowance for Credit Losses	101		94
States and political subdivisions
Held-to-maturity securities:
Amortized Cost	1,466		1,470
Gross Unrealized Gains	42		57
Gross Unrealized Losses	9		19
Estimated Fair Value	1,499		1,508
Allowance for Credit Losses	$ 0		$ 0