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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	$ 181,479	$ 92,615
Fair value more than 12 months	75,844	398,164
Total fair value	257,323	490,779
Unrealized losses less than 12 months	(1,766)	(1,767)
Unrealized losses more than 12 months	(817)	(12,794)
Total unrealized losses	(2,583)	(14,561)
U.S. Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	4,407
Fair value more than 12 months		9,707
Total fair value	4,407	9,707
Unrealized losses less than 12 months	(8)
Unrealized losses more than 12 months		(208)
Total unrealized losses	(8)	(208)
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	109,512	75,163
Fair value more than 12 months	9,681	106,335
Total fair value	119,193	181,498
Unrealized losses less than 12 months	(1,531)	(1,628)
Unrealized losses more than 12 months	(177)	(4,316)
Total unrealized losses	(1,708)	(5,944)
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	42,097	6,450
Fair value more than 12 months	24,652	106,257
Total fair value	66,749	112,707
Unrealized losses less than 12 months	(150)	(25)
Unrealized losses more than 12 months	(283)	(3,280)
Total unrealized losses	(433)	(3,305)
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	25,463	5,739
Fair value more than 12 months	41,511	175,865
Total fair value	66,974	181,604
Unrealized losses less than 12 months	(77)	(39)
Unrealized losses more than 12 months	(357)	(4,990)
Total unrealized losses	$ (434)	(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.

+ References

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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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