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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	$ 224,138	$ 92,615
Fair value more than 12 months	67,402	398,164
Total fair value	291,540	490,779
Unrealized losses less than 12 months	(2,788)	(1,767)
Unrealized losses more than 12 months	(574)	(12,794)
Total unrealized losses	(3,362)	(14,561)
U.S. Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	1,413
Fair value more than 12 months		9,707
Total fair value	1,413	9,707
Unrealized losses less than 12 months	(2)
Unrealized losses more than 12 months		(208)
Total unrealized losses	(2)	(208)
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	129,942	75,163
Fair value more than 12 months	6,279	106,335
Total fair value	136,221	181,498
Unrealized losses less than 12 months	(2,374)	(1,628)
Unrealized losses more than 12 months	(131)	(4,316)
Total unrealized losses	(2,505)	(5,944)
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	68,043	6,450
Fair value more than 12 months	23,301	106,257
Total fair value	91,344	112,707
Unrealized losses less than 12 months	(308)	(25)
Unrealized losses more than 12 months	(260)	(3,280)
Total unrealized losses	(568)	(3,305)
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	24,740	5,739
Fair value more than 12 months	37,822	175,865
Total fair value	62,562	181,604
Unrealized losses less than 12 months	(104)	(39)
Unrealized losses more than 12 months	(183)	(4,990)
Total unrealized losses	$ (287)	(5,029)
Corporate Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months		5,263
Total fair value		5,263
Unrealized losses less than 12 months		(75)
Total unrealized losses		$ (75)

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563

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