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Loans and Allowance for Credit Losses - Schedule of Allowance for Credit Losses on Unfunded Loan Commitments (Detail) - Unfunded Loan Commitment - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |
Balance at beginning of period | $ 11,689 | $ 2,656
Expense (reversal of expense) for credit losses | (1,324) | 1,745
Balance at end of period | 10,365 | 8,950
Cumulative Effect, Period of Adoption, Adjustment |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |
Balance at beginning of period | 0 | 4,549
Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |
Balance at beginning of period | $ 11,689 | $ 7,205

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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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