Investment Securities Other Investments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Other Investments Carrying Value [Line Items]
Other investment securities	$ 34,486,000		$ 34,486,000		$ 37,560,000
Proceeds from Sale of Federal Home Loan Bank Stock	7,500,000
Trading Securities, Change in Unrealized Holding Gain (Loss)	18,000	$ 1,000	91,000	$ 15,000
Securities of a single issuer, other than US Treasury, government agencies and US government sponsored agencies exceeding 10% of Stockholders' Equity	0		0
Reported Value Measurement [Member]
Other Investments Carrying Value [Line Items]
Federal Home Loan Bank Stock	17,918,000		17,918,000		21,718,000
Federal Reserve Bank ("FRB") stock	13,311,000		13,311,000		13,311,000
Other investment securities (b)	2,867,000		2,867,000		2,232,000
Reported Value Measurement [Member] | Other Security Investments [Member]
Other Investments Carrying Value [Line Items]
Other investment securities (b)	784,000		784,000		365,000
Other | Reported Value Measurement [Member]
Other Investments Carrying Value [Line Items]
Other investment securities (b)	784,000		784,000		365,000
Nonqualified Plan [Member] | Reported Value Measurement [Member]
Other Investments Carrying Value [Line Items]
Other investment securities (b)	2,083,000		2,083,000		1,867,000
Equity investment securities (a)
Other Investments Carrying Value [Line Items]
Other investment securities (b)	$ 390,000		$ 390,000		$ 299,000