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Investment Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Total investment securities	$ 2,097,839	$ 1,277,728
Asset Pledged as Collateral
Investment Holdings [Line Items]
Debt Securities, Amortized Cost	336,039	305,579
Total investment securities	291,631	305,179
Washington and Oregon state public deposits | Asset Pledged as Collateral
Investment Holdings [Line Items]
Debt Securities, Amortized Cost	156,784	128,216
Total investment securities	137,931	130,217
Federal Reserve Bank credit facility | Asset Pledged as Collateral
Investment Holdings [Line Items]
Debt Securities, Amortized Cost	60,660	61,057
Total investment securities	49,506	59,674
Securities sold under agreement to repurchase | Asset Pledged as Collateral
Investment Holdings [Line Items]
Debt Securities, Amortized Cost	63,685	59,887
Total investment securities	55,836	59,655
Other securities pledged | Asset Pledged as Collateral
Investment Holdings [Line Items]
Debt Securities, Amortized Cost	54,910	56,419
Total investment securities	$ 48,358	$ 55,633

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- Definition

Debt Securities, Amortized Cost

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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).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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