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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months	$ 352,517	$ 229,768
Fair value more than 12 months	313,819	193,869
Total fair value	666,336	423,637
Unrealized losses less than 12 months	(6,027)	(4,554)
Unrealized losses more than 12 months	(16,412)	(4,974)
Total unrealized losses	(22,439)	(9,528)
U.S. Treasury and Federal Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months	7,763	15,882
Fair value more than 12 months	8,809	2,870
Total fair value	16,572	18,752
Unrealized losses less than 12 months	(137)	(180)
Unrealized losses more than 12 months	(327)	(45)
Total unrealized losses	(464)	(225)
State and Municipal [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months	215,439	54,312
Fair value more than 12 months	56,725	30,691
Total fair value	272,164	85,003
Unrealized losses less than 12 months	(3,691)	(2,758)
Unrealized losses more than 12 months	(4,760)	(844)
Total unrealized losses	(8,451)	(3,602)
Federal Agency Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months	72,495	54,006
Fair value more than 12 months	102,498	73,462
Total fair value	174,993	127,468
Unrealized losses less than 12 months	(830)	(589)
Unrealized losses more than 12 months	(4,750)	(2,031)
Total unrealized losses	(5,580)	(2,620)
Federal Agency Mortgage-backed Pools [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months	48,696	103,926
Fair value more than 12 months	145,787	86,846
Total fair value	194,483	190,772
Unrealized losses less than 12 months	(1,270)	(1,019)
Unrealized losses more than 12 months	(6,575)	(2,054)
Total unrealized losses	(7,845)	(3,073)
Private Labeled Mortgage-backed Pools [Member]
Debt Securities, Available-for-sale [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]
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months	8,124
Total fair value	8,124
Unrealized losses less than 12 months	(99)
Total unrealized losses	$ (99)

X

- Definition

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

No definition available.

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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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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 less than twelve months.

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