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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, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | $ 541,396 |  | $ 585,404
Held-to-Maturity, Allowance for Credit Losses | (172) | $ (157) | (274)
Held-to-Maturity, Carrying Amount | 541,224 |  | 585,130
Held-to-Maturity, Gross Unrecognized Gains | 28,387 |  | 36,524
Held-to-Maturity, Gross Unrecognized Losses | (166) |  |
Held-to-Maturity, Fair Value | 569,445 |  | 621,654
States and Political Subdivisions [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 469,445 |  | 494,374
Held-to-Maturity, Allowance for Credit Losses | (45) | (41) | (42)
Held-to-Maturity, Carrying Amount | 469,400 |  | 494,332
Held-to-Maturity, Gross Unrecognized Gains | 25,849 |  | 32,489
Held-to-Maturity, Gross Unrecognized Losses | (158) |  |
Held-to-Maturity, Fair Value | 495,091 |  | 526,821
Corporate Bonds [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 51,974 |  | 69,981
Held-to-Maturity, Allowance for Credit Losses | (123) | (111) | (225)
Held-to-Maturity, Carrying Amount | 51,851 |  | 69,756
Held-to-Maturity, Gross Unrecognized Gains | 1,892 |  | 3,144
Held-to-Maturity, Gross Unrecognized Losses | (4) |  |
Held-to-Maturity, Fair Value | 53,739 |  | 72,900
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 5,060 |  | 7,261
Held-to-Maturity, Carrying Amount | 5,060 |  | 7,261
Held-to-Maturity, Gross Unrecognized Gains | 474 |  | 645
Held-to-Maturity, Fair Value | 5,534 |  | 7,906
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 | 14,801 |  | 13,626
Held-to-Maturity, Carrying Amount | 14,801 |  | 13,626
Held-to-Maturity, Gross Unrecognized Gains | 167 |  | 239
Held-to-Maturity, Gross Unrecognized Losses | (4) |  |
Held-to-Maturity, Fair Value | 14,964 |  | 13,865
Asset-Backed Securities [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 116 |  | 162
Held-to-Maturity, Allowance for Credit Losses | (4) | $ (5) | (7)
Held-to-Maturity, Carrying Amount | 112 |  | 155
Held-to-Maturity, Gross Unrecognized Gains | 5 |  | 7
Held-to-Maturity, Fair Value | $ 117 |  | $ 162

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