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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 446,683 | $ 208,556
12 Months or less, Unrealized Loss | (56,166) | (1,923)
More than 12 months, Fair Value | 127,104 | 5,137
More than 12 months, Unrealized Loss | (25,364) | (164)
Total Fair Value | 573,787 | 213,693
Total Unrealized Loss | (81,530) | (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 | 20,930 | 41,432
12 Months or less, Unrealized Loss | (880) | (473)
More than 12 months, Fair Value | 39,122 | 2,014
More than 12 months, Unrealized Loss | (4,797) | (57)
Total Fair Value | 60,052 | 43,446
Total Unrealized Loss | (5,677) | (530)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 266,106 | 25,797
12 Months or less, Unrealized Loss | (43,065) | (107)
More than 12 months, Fair Value | 8,192 |
More than 12 months, Unrealized Loss | (3,516) |
Total Fair Value | 274,298 | 25,797
Total Unrealized Loss | (46,581) | (107)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 159,647 | 141,327
12 Months or less, Unrealized Loss | (12,221) | (1,343)
More than 12 months, Fair Value | 79,790 | 3,123
More than 12 months, Unrealized Loss | (17,051) | (107)
Total Fair Value | 239,437 | 144,450
Total Unrealized Loss | $ (29,272) | $ (1,450)

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