Investment Securities Held-to-maturity Securities with Unrealized Loss (Details) $ in Thousands	Dec. 31, 2020 USD ($) securities	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($) securities
Schedule of Held-to-maturity Securities
Fair value of securities in unrealized loss position less than 12 months	$ 18,662		$ 9,397
Unrealized loss less than 12 months	$ 165		$ 68
Number of securities at an unrealized loss position less than 12 months | securities	5		2
Fair value of securities in unrealized loss more than 12 months	$ 0		$ 890
Unrealized loss more than 12 months	$ 0		$ 27
Number of securities at an unrealized loss position more than 12 months | securities	0		1
Total fair value	$ 18,662		$ 10,287
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	165		95
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(60)	$ 7
States and political subdivisions
Schedule of Held-to-maturity Securities
Fair value of securities in unrealized loss position less than 12 months	18,662
Unrealized loss less than 12 months	$ 165
Number of securities at an unrealized loss position less than 12 months | securities	5
Fair value of securities in unrealized loss more than 12 months	$ 0
Unrealized loss more than 12 months	$ 0
Number of securities at an unrealized loss position more than 12 months | securities	0
Total fair value	$ 18,662
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	165		0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(60)
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities
Fair value of securities in unrealized loss position less than 12 months			7,731
Unrealized loss less than 12 months			$ 67
Number of securities at an unrealized loss position less than 12 months | securities			1
Fair value of securities in unrealized loss more than 12 months			$ 890
Unrealized loss more than 12 months			$ 27
Number of securities at an unrealized loss position more than 12 months | securities			1
Total fair value			$ 8,621
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0		94
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities
Fair value of securities in unrealized loss position less than 12 months			1,666
Unrealized loss less than 12 months			$ 1
Number of securities at an unrealized loss position less than 12 months | securities			1
Fair value of securities in unrealized loss more than 12 months			$ 0
Unrealized loss more than 12 months			$ 0
Number of securities at an unrealized loss position more than 12 months | securities			0
Total fair value			$ 1,666
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	$ 0		$ 1