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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (47) | $ (238)
Fair Value, Less Than Twelve Months | 26,369 | 55,090
Gross Unrealized Losses, Twelve Months and Over |  | (142)
Fair Value, Twelve Months and Over |  | 27,107
Gross Unrealized Losses, Total | (47) | (380)
Fair Value, Total | 26,369 | 82,197
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Twelve Months and Over |  | (12)
Fair Value, Twelve Months and Over |  | 5,030
Gross Unrealized Losses, Total |  | (12)
Fair Value, Total |  | 5,030
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (10) | (16)
Fair Value, Less Than Twelve Months | 14,010 | 10,549
Gross Unrealized Losses, Twelve Months and Over |  | (5)
Fair Value, Twelve Months and Over |  | 10,745
Gross Unrealized Losses, Total | (10) | (21)
Fair Value, Total | 14,010 | 21,294
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (31) | (102)
Fair Value, Less Than Twelve Months | 11,298 | 27,696
Gross Unrealized Losses, Twelve Months and Over |  | (125)
Fair Value, Twelve Months and Over |  | 11,332
Gross Unrealized Losses, Total | (31) | (227)
Fair Value, Total | 11,298 | 39,028
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (6) | (120)
Fair Value, Less Than Twelve Months | 1,061 | 16,845
Gross Unrealized Losses, Total | (6) | (120)
Fair Value, Total | $ 1,061 | $ 16,845

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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