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Investment Securities - Textual (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Fair Value	$ 263,744,000	$ 263,744,000			$ 232,917,000
Allowance for credit losses on loans	73,340,000	73,340,000	$ 71,501,000	$ 37,993,000
Accrued Investment Income Receivable	3,300,000	3,300,000			3,700,000
Securities classified as trading	0	0			0
Available-for-sale Securities [Member]
Provision for Other Credit Losses	0	0
Allowance for credit losses on loans	0	0			0
Repurchase Agreements [Member]
Fair Value	44,822,000	44,822,000			22,294,000
Washington and Oregon State to Secure Public Deposits [Member]
Fair Value	186,198,000	186,198,000			190,773,000
Other securities pledged
Fair Value	$ 32,724,000	$ 32,724,000			$ 19,850,000

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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