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Securities - Schedule of Allowance for Credit Losses on Held-to-maturity Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items] |  |
Beginning balance | $ 326 |
Ending balance | 290 |
ASU 2016-13 [Member] |  |
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items] |  |
Beginning balance | 326 |
Impact of adopting ASC 326 |  | $ 229
Current period provision | (36) | 7
Ending balance | 290 | 236
ASU 2016-13 [Member] | Obligations of State and Political Subdivisions [Member] |  |
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items] |  |
Beginning balance | 130 |
Impact of adopting ASC 326 |  | 96
Current period provision | (12) | 2
Ending balance | 118 | 98
ASU 2016-13 [Member] | Corporate Debt Securities [Member] |  |
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items] |  |
Beginning balance | 196 |
Impact of adopting ASC 326 |  | 133
Current period provision | (24) | 5
Ending balance | $ 172 | $ 138

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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + 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 (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity), from change in methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity). + 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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