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Investment Securities - Pledged Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Held-to-maturity | [1] | $ 675,409 | $ 560,212
Asset Pledged as Collateral | Securing public and trust department deposits, and repurchase agreements: |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale |  | 745,164 | 779,244
Held-to-maturity |  | 523,317 | 312,921
Asset Pledged as Collateral | Securing additional borrowing capacity at the FHLB and the FRB: |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale |  | 3,520 | 3,972
Held-to-maturity |  | $ 1,254 | $ 128,870
[1] | Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $238, respectively, at September 30, 2023, and $0 and $241, respectively, at December 31, 2022.

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- Definition Amortized cost excluding accrued interest, 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). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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