Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Securities Available for Sale (Detail) $ in Thousands	Sep. 30, 2016 USD ($) Security	Dec. 31, 2015 USD ($) Security
Schedule of Available-for-sale Securities
Amortized cost	$ 1,265,842	$ 1,516,937
Gross Unrealized Gains	17,224	6,236
Gross Unrealized Losses	(6,357)	(16,312)
Fair Value	1,276,709	1,506,861
U.S. Treasury securities
Schedule of Available-for-sale Securities
Amortized cost	51,025	551,173
Gross Unrealized Gains	766	4
Gross Unrealized Losses	0	(1,704)
Fair Value	51,791	549,473
U.S. government agency securities
Schedule of Available-for-sale Securities
Amortized cost	23,764	29,316
Gross Unrealized Gains	339	665
Gross Unrealized Losses	(6)	(18)
Fair Value	24,097	29,963
Obligations of states and state agencies
Schedule of Available-for-sale Securities
Amortized cost	42,466	44,285
Gross Unrealized Gains	1,091	196
Gross Unrealized Losses	(40)	(67)
Fair Value	43,517	44,414
Municipal bonds
Schedule of Available-for-sale Securities
Amortized cost	80,155	80,717
Gross Unrealized Gains	1,939	209
Gross Unrealized Losses	(321)	(374)
Fair Value	81,773	80,552
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Amortized cost	122,621	125,002
Gross Unrealized Gains	3,030	405
Gross Unrealized Losses	(361)	(441)
Fair Value	125,290	124,966
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized cost	958,531	701,764
Gross Unrealized Gains	11,021	3,348
Gross Unrealized Losses	(2,914)	(8,684)
Fair Value	966,638	696,428
Trust preferred securities
Schedule of Available-for-sale Securities
Amortized cost	10,231	10,458
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,075)	(2,054)
Fair Value	8,156	8,404
Corporate and other debt securities
Schedule of Available-for-sale Securities
Amortized cost	79,148	78,202
Gross Unrealized Gains	1,623	1,239
Gross Unrealized Losses	(204)	(1,889)
Fair Value	80,567	77,552
Equity securities
Schedule of Available-for-sale Securities
Amortized cost	20,522	21,022
Gross Unrealized Gains	445	575
Gross Unrealized Losses	(797)	(1,522)
Fair Value	20,170	$ 20,075
Pooled Trust Preferred Securities
Schedule of Available-for-sale Securities
Amortized cost	10,200
Fair Value	$ 8,200
Number of available for sale securities (in security) \| Security	2	2

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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