Securities Held to Maturity (Summary of Amortized Cost, Unrealized Gains, Unrealized Losses and Estimated Fair Values) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 97,116	$ 98,060
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	3,187
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	8,674	5
Debt Securities, Held-to-maturity, Fair Value	88,442	101,242
Tax Exempt State and Political Subdivisions General Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	71,107	71,807
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	2,583
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	6,009	0
Debt Securities, Held-to-maturity, Fair Value	65,098	74,390
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	8,100	8,192
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	210
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	555	0
Debt Securities, Held-to-maturity, Fair Value	7,545	8,402
Tax Exempt State and Political Subdivisions Lease Revenues [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	4,275	4,316
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	74
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	507	0
Debt Securities, Held-to-maturity, Fair Value	3,768	4,390
Tax Exempt State and Political Subdivisions Sales Tax Revenues [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	4,549	4,582
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	106
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	548	0
Debt Securities, Held-to-maturity, Fair Value	4,001	4,688
Tax Exempt State and Political Subdivisions Various Tax Revenues
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	5,553
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	803
Debt Securities, Held-to-maturity, Fair Value	4,750
Tax Exempt State and Political Subdivisions Other Revenues [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	3,532	9,163
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	214
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	252	5
Debt Securities, Held-to-maturity, Fair Value	$ 3,280	$ 9,372