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Investments - Gross Unrealized Gains and Losses and Amortized Cost and Fair Value of Investments Classified as Held-to-Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Held-to-maturity, Amortized Cost, Totals	$ 613,878	$ 629,668
Held-to-Maturity, Gross Unrealized Gains	5,860	11,016
Held-to-Maturity, Gross Unrealized Losses	(2,966)	(1,375)
Held-to-Maturity, Fair Value	616,772	639,309
States and Political Subdivisions [Member]
Investment [Line Items]
Held-to-maturity, Amortized Cost, Totals	445,922	460,428
Held-to-Maturity, Gross Unrealized Gains	5,109	9,628
Held-to-Maturity, Gross Unrealized Losses	(2,084)	(955)
Held-to-Maturity, Fair Value	448,947	469,101
Corporate Bonds [Member]
Investment [Line Items]
Held-to-maturity, Amortized Cost, Totals	91,762	100,024
Held-to-Maturity, Gross Unrealized Gains	62	190
Held-to-Maturity, Gross Unrealized Losses	(455)	(167)
Held-to-Maturity, Fair Value	91,369	100,047
U.S. Agency-Based Mortgage-Backed Securities [Member]
Investment [Line Items]
Held-to-maturity, Amortized Cost, Totals	8,102	10,260
Held-to-Maturity, Gross Unrealized Gains	327	625
Held-to-Maturity, Gross Unrealized Losses	(80)	(40)
Held-to-Maturity, Fair Value	8,349	10,845
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Investment [Line Items]
Held-to-maturity, Amortized Cost, Totals	67,042	57,657
Held-to-Maturity, Gross Unrealized Gains	340	548
Held-to-Maturity, Gross Unrealized Losses	(339)	(198)
Held-to-Maturity, Fair Value	67,043	58,007
Asset-Backed Securities [Member]
Investment [Line Items]
Held-to-maturity, Amortized Cost, Totals	1,050	1,299
Held-to-Maturity, Gross Unrealized Gains	22	25
Held-to-Maturity, Gross Unrealized Losses	(8)	(15)
Held-to-Maturity, Fair Value	$ 1,064	$ 1,309

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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