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Investment Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Scheduled of amortized cost and fair value of securities pledged as collateral
Fair Value	$ 2,129,461	$ 1,277,728
Asset Pledged as Collateral
Scheduled of amortized cost and fair value of securities pledged as collateral
Amortized Cost	338,532	305,579
Fair Value	291,650	305,179
Washington and Oregon state public deposits | Asset Pledged as Collateral
Scheduled of amortized cost and fair value of securities pledged as collateral
Amortized Cost	158,082	128,216
Fair Value	138,003	130,217
Federal Reserve Bank credit facility | Asset Pledged as Collateral
Scheduled of amortized cost and fair value of securities pledged as collateral
Amortized Cost	60,763	61,057
Fair Value	49,037	59,674
Securities sold under agreement to repurchase | Asset Pledged as Collateral
Scheduled of amortized cost and fair value of securities pledged as collateral
Amortized Cost	64,087	59,887
Fair Value	55,825	59,655
Other securities pledged | Asset Pledged as Collateral
Scheduled of amortized cost and fair value of securities pledged as collateral
Amortized Cost	55,600	56,419
Fair Value	$ 48,785	$ 55,633

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- Definition

Debt Securities, Amortized Cost

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- Definition

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

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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).

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No definition available.

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