Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 99,914	$ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3,271
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	28
Debt securities, held-to-maturity, fair value	103,157
TEXAS
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	15,695
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	600
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0
Debt securities, held-to-maturity, fair value	16,295
CALIFORNIA
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	10,081
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	377
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0
Debt securities, held-to-maturity, fair value	10,458
PENNSYLVANIA
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	8,786
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	186
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0
Debt securities, held-to-maturity, fair value	8,972
FLORIDA
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	7,724
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	299
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0
Debt securities, held-to-maturity, fair value	8,023
MICHIGAN
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	7,160
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	144
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	3
Debt securities, held-to-maturity, fair value	$ 7,301