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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 166,565 | $ 302,275
12 Months or less, Unrealized Loss | (3,483) | (18,609)
More than 12 months, Fair Value | 329,437 | 238,156
More than 12 months, Unrealized Loss | (55,113) | (49,159)
Total Fair Value | 496,002 | 540,431
Total Unrealized Loss | (58,596) | (67,768)
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 | 20,129 | 21,042
12 Months or less, Unrealized Loss | (482) | (880)
More than 12 months, Fair Value | 41,506 | 39,567
More than 12 months, Unrealized Loss | (3,808) | (4,606)
Total Fair Value | 61,635 | 60,609
Total Unrealized Loss | (4,290) | (5,486)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 55,169 | 169,594
12 Months or less, Unrealized Loss | (620) | (13,016)
More than 12 months, Fair Value | 148,004 | 73,967
More than 12 months, Unrealized Loss | (26,894) | (20,624)
Total Fair Value | 203,173 | 243,561
Total Unrealized Loss | (27,514) | (33,640)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 91,267 | 111,639
12 Months or less, Unrealized Loss | (2,381) | (4,713)
More than 12 months, Fair Value | 139,927 | 124,622
More than 12 months, Unrealized Loss | (24,411) | (23,929)
Total Fair Value | 231,194 | 236,261
Total Unrealized Loss | $ (26,792) | $ (28,642)

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