Securities (Summary of Amortized Cost, Unrealized Gains, Unrealized Losses and Estimated Fair Values Held to Maturity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 98,060	$ 99,914
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3,187	3,271
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	5	28
Debt securities, held-to-maturity, fair value	101,242	103,157
Tax Exempt State and Political Subdivisions General Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	71,807	73,179
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2,583	2,524
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt securities, held-to-maturity, fair value	74,390	75,703
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	8,192	8,375
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	210	256
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt securities, held-to-maturity, fair value	8,402	8,631
Tax Exempt State and Political Subdivisions Lease Revenues [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	4,316	4,395
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	74	88
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt securities, held-to-maturity, fair value	4,390	4,483
Tax Exempt State and Political Subdivisions Sales Tax Revenues
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	4,582	4,649
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	106	94
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	3
Debt securities, held-to-maturity, fair value	4,688	4,740
Tax Exempt State and Political Subdivisions Other Revenues [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	9,163	9,316
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	214	309
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	5	25
Debt securities, held-to-maturity, fair value	$ 9,372	$ 9,600