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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (4,842) | $ (140)
Fair Value, Less Than Twelve Months | 256,800 | 51,893
Gross Unrealized Losses, Twelve Months and Over | (2,221) |
Fair Value, Twelve Months and Over | 63,659 |
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (1,598) |
Fair Value, Less Than Twelve Months | 89,177 |
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (1,898) | (130)
Fair Value, Less Than Twelve Months | 86,739 | 48,331
Gross Unrealized Losses, Twelve Months and Over | (1,584) |
Fair Value, Twelve Months and Over | 41,738 |
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (1,050) |
Fair Value, Less Than Twelve Months | 63,157 |
Gross Unrealized Losses, Twelve Months and Over | (412) |
Fair Value, Twelve Months and Over | 16,434 |
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (296) | (10)
Fair Value, Less Than Twelve Months | 17,727 | $ 3,562
Gross Unrealized Losses, Twelve Months and Over | (225) |
Fair Value, Twelve Months and Over | $ 5,487 |

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- Definition Amount of accumulated unrealized loss on 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 12 months or longer, 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 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: 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=124269663&loc=SL82922890-210455 + Details
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