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Securities - Carrying Value of Held-to-Maturity Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Amortized cost | $ 1,103,628 | $ 1,143,548 |  |
Net loss on date of transfer from available-for-sale | (13,556) | (13,556) |  |
Allowance for securities credit losses | (1,380) | (1,467) | $ (1,717) | $ (1,715)
Accretion of net unrealized loss on securities reclassified as held-to-maturity | 10,822 | 10,668 |  |
Carrying value | $ 1,099,514 | $ 1,139,193 |  |

X
- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity). + References No definition available. + Details
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