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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (343) | $ (6,965)
Fair Value, Less Than Twelve Months | 15,778 | 99,357
Gross Unrealized Losses, Twelve Months and Over | (39,253) | (41,501)
Fair Value, Twelve Months and Over | 351,494 | 286,095
Gross Unrealized Losses, Total | (39,596) | (48,466)
Fair Value, Total | 367,272 | 385,452
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (19) | (207)
Fair Value, Less Than Twelve Months | 727 | 9,121
Gross Unrealized Losses, Twelve Months and Over | (7,684) | (9,622)
Fair Value, Twelve Months and Over | 86,785 | 85,557
Gross Unrealized Losses, Total | (7,703) | (9,829)
Fair Value, Total | 87,512 | 94,678
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (48) | (1,081)
Fair Value, Less Than Twelve Months | 1,952 | 24,560
Gross Unrealized Losses, Twelve Months and Over | (13,949) | (15,969)
Fair Value, Twelve Months and Over | 128,156 | 114,906
Gross Unrealized Losses, Total | (13,997) | (17,050)
Fair Value, Total | 130,108 | 139,466
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (28) | (2,454)
Fair Value, Less Than Twelve Months | 3,099 | 26,905
Gross Unrealized Losses, Twelve Months and Over | (12,000) | (11,687)
Fair Value, Twelve Months and Over | 83,221 | 60,022
Gross Unrealized Losses, Total | (12,028) | (14,141)
Fair Value, Total | 86,320 | 86,927
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (248) | (3,223)
Fair Value, Less Than Twelve Months | 10,000 | 38,771
Gross Unrealized Losses, Twelve Months and Over | (5,620) | (4,223)
Fair Value, Twelve Months and Over | 53,332 | 25,610
Gross Unrealized Losses, Total | (5,868) | (7,446)
Fair Value, Total | $ 63,332 | $ 64,381

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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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