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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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