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Securities - Contractual Maturity Information for Securities Held to Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Investments Debt And Equity Securities [Abstract] |  |
Due in 1 year or less, Amortized Cost | $ 8,364 | $ 4,907
Due after 1 year through 5 years, Amortized Cost | 154,850 | 123,643
Due after 5 years through 10 years, Amortized Cost | 501,529 | 423,759
Due after 10 years, Amortized Cost | 424,681 | 462,305
Total state and political subdivisions, Amortized Cost | 1,089,424 | 1,014,614
Allowance for credit losses | (2,116) | (2,610)
Total state and political subdivisions, net of allowance for credit losses | 1,087,308 | 1,012,004
Due in 1 year or less, Gross Unrealized Gains | 370 | 29
Due after 1 year through 5 years, Gross Unrealized Gains | 1,574 | 3,402
Due after 5 years through 10 years, Gross Unrealized Gains | 4,117 | 12,845
Due after 10 years, Gross Unrealized Gains | 1,882 | 13,447
Total state and political subdivisions, Gross Unrealized Gains | 7,943 | 29,723
Due in 1 year or less, Gross Unrealized Losses | (9) |
Due after 1 year through 5 years, Gross Unrealized Losses | (300) | (144)
Due after 5 years through 10 years, Gross Unrealized Losses | (7,497) | (1,566)
Due after 10 years, Gross Unrealized Losses | (24,745) | (13,183)
Total state and political subdivisions, Gross Unrealized Losses | (32,551) | (14,893)
Due in 1 year or less, Fair Value | 8,725 | 4,936
Due after 1 year through 5 years, Fair Value | 156,124 | 126,901
Due after 5 years through 10 years, Fair Value | 498,149 | 435,038
Due after 10 years, Fair Value | 401,818 | 462,569
Total state and political subdivisions, Fair Value | $ 1,064,816 | $ 1,029,444

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