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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	$ 92,615	$ 229,768
Fair value more than 12 months	398,164	193,869
Total fair value	490,779	423,637
Unrealized losses less than 12 months	(1,767)	(4,554)
Unrealized losses more than 12 months	(12,794)	(4,974)
Total unrealized losses	(14,561)	(9,528)
U.S. Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months		15,882
Fair value more than 12 months	9,707	2,870
Total fair value	9,707	18,752
Unrealized losses less than 12 months		(180)
Unrealized losses more than 12 months	(208)	(45)
Total unrealized losses	(208)	(225)
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	75,163	54,312
Fair value more than 12 months	106,335	30,691
Total fair value	181,498	85,003
Unrealized losses less than 12 months	(1,628)	(2,758)
Unrealized losses more than 12 months	(4,316)	(844)
Total unrealized losses	(5,944)	(3,602)
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	6,450	54,006
Fair value more than 12 months	106,257	73,462
Total fair value	112,707	127,468
Unrealized losses less than 12 months	(25)	(589)
Unrealized losses more than 12 months	(3,280)	(2,031)
Total unrealized losses	(3,305)	(2,620)
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months	5,739	103,926
Fair value more than 12 months	175,865	86,846
Total fair value	181,604	190,772
Unrealized losses less than 12 months	(39)	(1,019)
Unrealized losses more than 12 months	(4,990)	(2,054)
Total unrealized losses	(5,029)	(3,073)
Private Labeled Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value less than 12 months		1,642
Total fair value		1,642
Unrealized losses less than 12 months		(8)
Total unrealized losses		$ (8)
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=82897076&loc=d3e27337-111563

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