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v3.23.3

Investments - Gross Unrecognized Gains and Losses and Cost or Amortized Cost, Allowance for Credit Losses, Carrying Amount and Fair Value of Investments Classified as Held-to-Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | $ 487,354 |  | $ 491,927
Held-to-Maturity, Allowance for Credit Losses | (188) | $ (204) | (239)
Held-to-Maturity, Carrying Amount | 487,166 |  | 491,688
Held-to-Maturity, Gross Unrecognized Gains | 131 |  | 983
Held-to-Maturity, Gross Unrecognized Losses | (35,278) |  | (24,527)
Held To Maturity Securities Fair Value | 452,019 |  | 468,144
States and Political Subdivisions [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 420,017 |  | 415,136
Held-to-Maturity, Allowance for Credit Losses | (37) | (41) | (40)
Held-to-Maturity, Carrying Amount | 419,980 |  | 415,096
Held-to-Maturity, Gross Unrecognized Gains | 113 |  | 922
Held-to-Maturity, Gross Unrecognized Losses | (30,814) |  | (20,074)
Held To Maturity Securities Fair Value | 389,279 |  | 395,944
Corporate Bonds [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 52,727 |  | 59,903
Held-to-Maturity, Allowance for Credit Losses | (150) | (161) | (196)
Held-to-Maturity, Carrying Amount | 52,577 |  | 59,707
Held-to-Maturity, Gross Unrecognized Gains |  |  | 1
Held-to-Maturity, Gross Unrecognized Losses | (3,562) |  | (3,857)
Held To Maturity Securities Fair Value | 49,015 |  | 55,851
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 3,403 |  | 3,696
Held-to-Maturity, Carrying Amount | 3,403 |  | 3,696
Held-to-Maturity, Gross Unrecognized Gains | 4 |  | 33
Held-to-Maturity, Gross Unrecognized Losses | (253) |  | (153)
Held To Maturity Securities Fair Value | 3,154 |  | 3,576
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 11,162 |  | 13,123
Held-to-Maturity, Carrying Amount | 11,162 |  | 13,123
Held-to-Maturity, Gross Unrecognized Gains | 14 |  | 25
Held-to-Maturity, Gross Unrecognized Losses | (649) |  | (442)
Held To Maturity Securities Fair Value | 10,527 |  | 12,706
Asset-Backed Securities [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 45 |  | 69
Held-to-Maturity, Allowance for Credit Losses | (1) | $ (2) | (3)
Held-to-Maturity, Carrying Amount | 44 |  | 66
Held-to-Maturity, Gross Unrecognized Gains |  |  | 2
Held-to-Maturity, Gross Unrecognized Losses |  |  | (1)
Held To Maturity Securities Fair Value | $ 44 |  | $ 67

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