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Investment Securities - Textual (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Fair Value	$ 199,276,000	$ 194,890,000
Allowance for credit losses on loans	64,225,000	70,185,000	$ 47,540,000	$ 36,171,000
Accrued Investment Income Receivable	3,400,000	3,600,000
Securities classified as trading	0	0
Available-for-sale Securities [Member]
Allowance for credit losses on loans	0	0
Repurchase Agreements [Member]
Fair Value	48,178,000	39,945,000
Washington and Oregon State to Secure Public Deposits [Member]
Fair Value	122,419,000	124,228,000
Other securities pledged
Fair Value	$ 28,679,000	$ 30,717,000

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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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