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Investment Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
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

Debt Securities, Amortized Cost

+ References

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- Definition

Scheduled of amortized cost and fair value of securities pledged as collateral.

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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

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