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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Marketable Securities [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 7,984	$ 207
Held-to-Maturity, Gross Unrealized Losses, Total	12,621	11,795
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	175,099	40,293
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	7,984	207
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater	60,615	184,313
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater	4,637	11,588
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	235,714	224,606
Corporate Bonds [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,790	96
Held-to-Maturity, Gross Unrealized Losses, Total	2,783	3,486
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	71,069	26,178
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	1,790	96
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater	19,000	93,538
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater	993	3,390
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	90,069	119,716
U.S. Agency-Based Mortgage-Backed Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	446
Held-to-Maturity, Gross Unrealized Losses, Total	486	445
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	3,840
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	446
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater	219	4,745
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater	40	445
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	4,059	4,745
States and Political Subdivisions [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5,748	111
Held-to-Maturity, Gross Unrealized Losses, Total	8,430	6,719
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	100,190	14,115
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	5,748	111
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater	27,446	72,358
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater	2,682	6,608
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	127,636	86,473
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Marketable Securities [Line Items]
Held-to-Maturity, Gross Unrealized Losses, Less Than 12 Months	0
Held-to-Maturity, Gross Unrealized Losses, Total	922	1,145
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	0
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater	13,950	13,672
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater	922	1,145
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	$ 13,950	$ 13,672

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