Securities Held to Maturity (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 97,589	$ 98,060
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	3,187
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	4,305	5
Debt Securities, Held-to-maturity, Fair Value	93,284	$ 101,242
TEXAS
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	15,326
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	498
Debt Securities, Held-to-maturity, Fair Value	14,828
CALIFORNIA
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	9,823
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	357
Debt Securities, Held-to-maturity, Fair Value	9,466
PENNSYLVANIA
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	8,596
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	281
Debt Securities, Held-to-maturity, Fair Value	8,315
FLORIDA
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	7,563
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	406
Debt Securities, Held-to-maturity, Fair Value	7,157
MICHIGAN
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	7,001
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	365
Debt Securities, Held-to-maturity, Fair Value	$ 6,636

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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