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Securities - Schedule of Carrying Value of Debt Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |  |
Amortized cost | $ 1,192,166 | $ 1,224,564 |  |  |  |
Allowance for securities credit losses | (932) | (1,128) | $ (964) | $ (1,234) | $ (1,293) | $ (1,467)
Net loss on date of transfer from available-for-sale | (13,556) | (13,556) |  |  |  |
Accretion of net unrealized loss on securities reclassified as held-to-maturity | 11,661 | 11,258 |  |  |  |
Carrying value | $ 1,189,339 | $ 1,221,138 |  |  |  |

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- Definition Unrealized holding gain (loss) related to transfers of securities into held-to-maturity classification and out of the available-for-sale classification. + References No definition available. + Details
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- Definition Other comprehensive income reclassification of accretion of net unrealized losses to held to maturity securities. + References No definition available. + Details
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- Definition Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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- Definition Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 + Details
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