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Off-Balance Sheet Commitments - Allowance for Credit Losses Related to Off-Balance Sheet Items (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Loss Contingencies [Line Items] |  |  |  |
Balance at beginning of period | $ 2,342 | $ 2,885 | $ 2,792 | $ 2,397
Adjusted balance | 2,342 | 2,885 | 2,792 | 2,062
Provision expense (income) for credit losses | 1,301 | 3,462 | 851 | 4,285
Balance at end of period | $ 3,643 | $ 6,347 | $ 3,643 | 6,347
ASU 2016-13 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Adjustment related to adoption of ASU 2016-13 |  |  |  | $ (335)

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- Definition Off​-balance​ sheet​ credit​ loss​ liability ​after adjustment. + References No definition available. + Details
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- Definition Off balance sheet credit loss liability effect of new accounting principle in period of adoption. + References No definition available. + Details
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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=121599878&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=121599337&loc=SL82919249-210447 + Details
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