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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	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity, Amortized Cost, Totals	$ 541,573		$ 549,426
Held-to-Maturity, Allowance for Credit Losses	(276)	$ (290)	(195)
Held-to-Maturity, Carrying Amount	541,297		549,231
Held-to-Maturity, Gross Unrecognized Gains	2,374		27,032
Held-to-Maturity, Gross Unrecognized Losses	(18,034)		(413)
Held-to-Maturity, Fair Value	525,637		575,850
States and Political Subdivisions [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity, Amortized Cost, Totals	453,781		471,688
Held-to-Maturity, Allowance for Credit Losses	(44)	(45)	(48)
Held-to-Maturity, Carrying Amount	453,737		471,640
Held-to-Maturity, Gross Unrecognized Gains	2,160		25,175
Held-to-Maturity, Gross Unrecognized Losses	(14,707)		(263)
Held-to-Maturity, Fair Value	441,190		496,552
Corporate Bonds [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity, Amortized Cost, Totals	66,419		56,756
Held-to-Maturity, Allowance for Credit Losses	(228)	(241)	(143)
Held-to-Maturity, Carrying Amount	66,191		56,613
Held-to-Maturity, Gross Unrecognized Gains	37		1,344
Held-to-Maturity, Gross Unrecognized Losses	(3,073)		(114)
Held-to-Maturity, Fair Value	63,155		57,843
U.S. Agency-Based Mortgage-Backed Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity, Amortized Cost, Totals	4,102		4,623
Held-to-Maturity, Carrying Amount	4,102		4,623
Held-to-Maturity, Gross Unrecognized Gains	106		377
Held-to-Maturity, Gross Unrecognized Losses	(57)
Held-to-Maturity, Fair Value	4,151		5,000
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	17,182		16,251
Held-to-Maturity, Carrying Amount	17,182		16,251
Held-to-Maturity, Gross Unrecognized Gains	67		132
Held-to-Maturity, Gross Unrecognized Losses	(196)		(36)
Held-to-Maturity, Fair Value	17,053		16,347
Asset-Backed Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity, Amortized Cost, Totals	89		108
Held-to-Maturity, Allowance for Credit Losses	(4)	$ (4)	(4)
Held-to-Maturity, Carrying Amount	85		104
Held-to-Maturity, Gross Unrecognized Gains	4		4
Held-to-Maturity, Gross Unrecognized Losses	(1)
Held-to-Maturity, Fair Value	$ 88		$ 108

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