Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Securities Available for Sale (Detail) $ in Thousands	Mar. 31, 2016 USD ($) Security	Dec. 31, 2015 USD ($) Security
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,449,213	$ 1,516,937
Gross Unrealized Gains	13,032	6,236
Gross Unrealized Losses	(9,756)	(16,312)
Fair Value	1,452,489	1,506,861
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	411,059	551,173
Gross Unrealized Gains	295	4
Gross Unrealized Losses	(19)	(1,704)
Fair Value	411,335	549,473
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	26,290	29,316
Gross Unrealized Gains	645	665
Gross Unrealized Losses	(13)	(18)
Fair Value	26,922	29,963
Obligations of states and state agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	43,704	44,285
Gross Unrealized Gains	839	196
Gross Unrealized Losses	(6)	(67)
Fair Value	44,537	44,414
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	80,610	80,717
Gross Unrealized Gains	1,389	209
Gross Unrealized Losses	(314)	(374)
Fair Value	81,685	80,552
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	124,314	125,002
Gross Unrealized Gains	2,228	405
Gross Unrealized Losses	(320)	(441)
Fair Value	126,222	124,966
Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	778,775	701,764
Gross Unrealized Gains	7,852	3,348
Gross Unrealized Losses	(3,979)	(8,684)
Fair Value	782,648	696,428
Trust preferred securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	10,401	10,458
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,142)	(2,054)
Fair Value	8,259	8,404
Corporate and other debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	77,852	78,202
Gross Unrealized Gains	1,628	1,239
Gross Unrealized Losses	(1,272)	(1,889)
Fair Value	78,208	77,552
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	20,522	21,022
Gross Unrealized Gains	384	575
Gross Unrealized Losses	(2,011)	(1,522)
Fair Value	18,895	$ 20,075
Pooled Trust Preferred Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	7,600
Fair Value	$ 6,100
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=51813488&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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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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
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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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