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Allowance for Credit Losses - Off-Balance Sheet Credit Exposures (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Liabilities for off-balance sheet credit exposures at beginning of period | $ 1,920 | $ 476 | $ 748
Provision (credit) for credit loss expense related to off-balance sheet credit exposures | 586 | 1,062 | (272)
Liabilities for off-balance sheet credit exposures at end of period | 2,506 | 1,920 | 476
Cumulative Effect, Adjustment |  |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Liabilities for off-balance sheet credit exposures at beginning of period | $ 0 | 382 | 0
Liabilities for off-balance sheet credit exposures at end of period |  | $ 0 | $ 382

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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Details
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