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Investment Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Scheduled of amortized cost and fair value of securities pledged as collateral |  |
Fair Value | $ 2,078,235 | $ 2,097,839
Asset Pledged as Collateral |  |
Scheduled of amortized cost and fair value of securities pledged as collateral |  |
Amortized Cost | 975,325 | 336,039
Fair Value | 886,706 | 291,631
Washington and Oregon state public deposits | Asset Pledged as Collateral |  |
Scheduled of amortized cost and fair value of securities pledged as collateral |  |
Amortized Cost | 214,331 | 156,784
Fair Value | 203,452 | 137,931
Federal Reserve Bank credit facility | Asset Pledged as Collateral |  |
Scheduled of amortized cost and fair value of securities pledged as collateral |  |
Amortized Cost | 656,858 | 60,660
Fair Value | 588,576 | 49,506
Securities sold under agreement to repurchase | Asset Pledged as Collateral |  |
Scheduled of amortized cost and fair value of securities pledged as collateral |  |
Amortized Cost | 49,795 | 63,685
Fair Value | 45,832 | 55,836
Other securities pledged | Asset Pledged as Collateral |  |
Scheduled of amortized cost and fair value of securities pledged as collateral |  |
Amortized Cost | 54,341 | 54,910
Fair Value | $ 48,846 | $ 48,358

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 + Details
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