Investment Securities Held-to-maturity Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
Schedule of Held-to-maturity Securities
Held-to-maturity investment securities, at amortized cost (fair value of $68,082 at December 31, 2020 and $32,541 at December 31, 2019) (a)(b)	$ 66,458,000	$ 31,747,000
Amortized Cost	66,518,000	31,747,000
Gross Unrealized Gains	1,789,000	889,000
Gross Unrealized Losses	165,000	95,000
Fair Value	68,082,000	32,541,000
Gross realized gains or losses	0	0	$ 0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(60,000)			$ 7,000
Reported Value Measurement [Member]
Schedule of Held-to-maturity Securities
Held-to-maturity investment securities, at amortized cost (fair value of $68,082 at December 31, 2020 and $32,541 at December 31, 2019) (a)(b)	66,458,000	31,747,000
States and political subdivisions
Schedule of Held-to-maturity Securities
Held-to-maturity investment securities, at amortized cost (fair value of $68,082 at December 31, 2020 and $32,541 at December 31, 2019) (a)(b)	35,199,000
Amortized Cost	35,199,000
Gross Unrealized Gains	510,000	445,000
Gross Unrealized Losses	165,000	0
Fair Value	35,484,000	4,791,000
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(60,000)
States and political subdivisions | Reported Value Measurement [Member]
Schedule of Held-to-maturity Securities
Held-to-maturity investment securities, at amortized cost (fair value of $68,082 at December 31, 2020 and $32,541 at December 31, 2019) (a)(b)	35,139,000	4,346,000
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities
Amortized Cost	25,890,000
Gross Unrealized Gains	852,000	169,000
Gross Unrealized Losses	0	94,000
Fair Value	26,742,000	21,569,000
Residential mortgage-backed securities | Reported Value Measurement [Member]
Schedule of Held-to-maturity Securities
Held-to-maturity investment securities, at amortized cost (fair value of $68,082 at December 31, 2020 and $32,541 at December 31, 2019) (a)(b)	25,890,000	21,494,000
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities
Amortized Cost	5,429,000
Gross Unrealized Gains	427,000	275,000
Gross Unrealized Losses	0	1,000
Fair Value	5,856,000	6,181,000
Commercial mortgage-backed securities | Reported Value Measurement [Member]
Schedule of Held-to-maturity Securities
Held-to-maturity investment securities, at amortized cost (fair value of $68,082 at December 31, 2020 and $32,541 at December 31, 2019) (a)(b)	$ 5,429,000	$ 5,907,000