Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	$ 92,754	$ 95,999
Available-for-sale securities, Amortized Cost	92,754
Available-for-sale securities, Gross Unrealized Gains	6	7
Available-for-sale securities, Gross Unrealized Losses	11,235	12,419
Available-for-sale, at fair value (amortized cost of $92,754 (2023) and $95,999 (2022))	81,525	83,587
Held-to-maturity Securities, Amortized Cost	549,096	559,455
Held-to-maturity Securities, Amortized Cost	549,096	559,455
Held-to-maturity securities, Gross Unrealized Gains	54	35
Held-to-maturity securities, Gross Unrealized Losses	58,034	64,863
Held-to-maturity securities, Estimated Fair Value	491,116	494,627
Equity securities, at fair value	1,258	1,233
U.S. Government agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost		21,798
Available-for-sale securities, Amortized Cost	21,587
Available-for-sale securities, Gross Unrealized Gains	5	5
Available-for-sale securities, Gross Unrealized Losses	3,283	3,625
Available-for-sale, at fair value (amortized cost of $92,754 (2023) and $95,999 (2022))	18,309	18,178
Held-to-maturity Securities, Amortized Cost		148,097
Held-to-maturity Securities, Amortized Cost	146,699
Held-to-maturity securities, Gross Unrealized Losses	11,815	13,601
Held-to-maturity securities, Estimated Fair Value	134,884	134,496
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity Securities, Amortized Cost		1,474
Held-to-maturity Securities, Amortized Cost	1,473
Held-to-maturity securities, Gross Unrealized Gains	54	35
Held-to-maturity securities, Gross Unrealized Losses	13	28
Held-to-maturity securities, Estimated Fair Value	1,514	1,481
Mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost		72,183
Available-for-sale securities, Amortized Cost	69,151
Available-for-sale securities, Gross Unrealized Gains	1	2
Available-for-sale securities, Gross Unrealized Losses	7,779	8,666
Available-for-sale, at fair value (amortized cost of $92,754 (2023) and $95,999 (2022))	61,373	63,519
Held-to-maturity Securities, Amortized Cost		398,884
Held-to-maturity Securities, Amortized Cost	389,924
Held-to-maturity securities, Gross Unrealized Losses	45,379	50,464
Held-to-maturity securities, Estimated Fair Value	344,545	348,420
Other debt securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost		2,018
Available-for-sale securities, Amortized Cost	2,016
Available-for-sale securities, Gross Unrealized Losses	173	128
Available-for-sale, at fair value (amortized cost of $92,754 (2023) and $95,999 (2022))	1,843	1,890
Held-to-maturity Securities, Amortized Cost		11,000
Held-to-maturity Securities, Amortized Cost	11,000
Held-to-maturity securities, Gross Unrealized Losses	827	770
Held-to-maturity securities, Estimated Fair Value	$ 10,173	$ 10,230