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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 302,275 | $ 208,556
12 Months or less, Unrealized Loss | (18,609) | (1,923)
More than 12 months, Fair Value | 238,156 | 5,137
More than 12 months, Unrealized Loss | (49,159) | (164)
Total Fair Value | 540,431 | 213,693
Total Unrealized Loss | (67,768) | (2,087)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 21,042 | 41,432
12 Months or less, Unrealized Loss | (880) | (473)
More than 12 months, Fair Value | 39,567 | 2,014
More than 12 months, Unrealized Loss | (4,606) | (57)
Total Fair Value | 60,609 | 43,446
Total Unrealized Loss | (5,486) | (530)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 169,594 | 25,797
12 Months or less, Unrealized Loss | (13,016) | (107)
More than 12 months, Fair Value | 73,967 |
More than 12 months, Unrealized Loss | (20,624) |
Total Fair Value | 243,561 | 25,797
Total Unrealized Loss | (33,640) | (107)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 111,639 | 141,327
12 Months or less, Unrealized Loss | (4,713) | (1,343)
More than 12 months, Fair Value | 124,622 | 3,123
More than 12 months, Unrealized Loss | (23,929) | (107)
Total Fair Value | 236,261 | 144,450
Total Unrealized Loss | $ (28,642) | $ (1,450)

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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 https://asc.fasb.org/extlink&oid=124269663&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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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