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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (6,965) | $ (4,842)
Fair Value, Less Than Twelve Months | 99,357 | 256,800
Gross Unrealized Losses, Twelve Months and Over | (41,501) | (2,221)
Fair Value, Twelve Months and Over | 286,095 | 63,659
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (207) | (1,598)
Fair Value, Less Than Twelve Months | 9,121 | 89,177
Gross Unrealized Losses, Twelve Months and Over | (9,622) |
Fair Value, Twelve Months and Over | 85,557 |
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (1,081) | (1,898)
Fair Value, Less Than Twelve Months | 24,560 | 86,739
Gross Unrealized Losses, Twelve Months and Over | (15,969) | (1,584)
Fair Value, Twelve Months and Over | 114,906 | 41,738
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (2,454) | (1,050)
Fair Value, Less Than Twelve Months | 26,905 | 63,157
Gross Unrealized Losses, Twelve Months and Over | (11,687) | (412)
Fair Value, Twelve Months and Over | 60,022 | 16,434
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (3,223) | (296)
Fair Value, Less Than Twelve Months | 38,771 | 17,727
Gross Unrealized Losses, Twelve Months and Over | (4,223) | (225)
Fair Value, Twelve Months and Over | $ 25,610 | $ 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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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