Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment Securities Available for Sale (Detail) $ in Thousands	Dec. 31, 2016 USD ($) Security	Dec. 31, 2015 USD ($) Security
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,315,723	$ 1,516,937
Gross Unrealized Gains	4,066	6,236
Gross Unrealized Losses	(22,416)	(16,312)
Available for sale	1,297,373	1,506,861
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	51,020	551,173
Gross Unrealized Gains	6	4
Gross Unrealized Losses	(1,435)	(1,704)
Available for sale	49,591	549,473
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	22,815	29,316
Gross Unrealized Gains	232	665
Gross Unrealized Losses	(6)	(18)
Available for sale	23,041	29,963
Obligations of states and state agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	40,696	44,285
Gross Unrealized Gains	70	196
Gross Unrealized Losses	(424)	(67)
Available for sale	40,342	44,414
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	80,045	80,717
Gross Unrealized Gains	147	209
Gross Unrealized Losses	(767)	(374)
Available for sale	79,425	80,552
Total obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	120,741	125,002
Gross Unrealized Gains	217	405
Gross Unrealized Losses	(1,191)	(441)
Available for sale	119,767	124,966
Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,029,827	701,764
Gross Unrealized Gains	2,061	3,348
Gross Unrealized Losses	(16,346)	(8,684)
Available for sale	$ 1,015,542	$ 696,428
Trust preferred securities
Schedule of Available-for-sale Securities [Line Items]
Number of available for sale securities (in security) \| Security	2	2
Amortized cost	$ 10,164	$ 10,458
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,155)	(2,054)
Available for sale	8,009	8,404
Corporate and other debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	60,651	78,202
Gross Unrealized Gains	436	1,239
Gross Unrealized Losses	(522)	(1,889)
Available for sale	60,565	77,552
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	20,505	21,022
Gross Unrealized Gains	1,114	575
Gross Unrealized Losses	(761)	(1,522)
Available for sale	$ 20,858	$ 20,075

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
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-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

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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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