Investment Securities - Amortized Cost, Securities Available for Sale (Detail) $ in Thousands	Mar. 31, 2017 USD ($) Security	Dec. 31, 2016 USD ($) Security
Schedule of Available-for-sale Securities
Amortized Cost	$ 1,470,374	$ 1,315,723
Gross Unrealized Gains	4,729	4,066
Gross Unrealized Losses	(20,772)	(22,416)
Fair Value	1,454,331	1,297,373
U.S. Treasury securities
Schedule of Available-for-sale Securities
Amortized Cost	51,014	51,020
Gross Unrealized Gains	6	6
Gross Unrealized Losses	(1,240)	(1,435)
Fair Value	49,780	49,591
U.S. government agency securities
Schedule of Available-for-sale Securities
Amortized Cost	47,080	22,815
Gross Unrealized Gains	216	232
Gross Unrealized Losses	(21)	(6)
Fair Value	47,275	23,041
Obligations of states and state agencies
Schedule of Available-for-sale Securities
Amortized Cost	39,624	40,696
Gross Unrealized Gains	133	70
Gross Unrealized Losses	(203)	(424)
Fair Value	39,554	40,342
Municipal bonds
Schedule of Available-for-sale Securities
Amortized Cost	79,935	80,045
Gross Unrealized Gains	201	147
Gross Unrealized Losses	(528)	(767)
Fair Value	79,608	79,425
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	119,559	120,741
Gross Unrealized Gains	334	217
Gross Unrealized Losses	(731)	(1,191)
Fair Value	119,162	119,767
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	1,171,958	1,029,827
Gross Unrealized Gains	2,673	2,061
Gross Unrealized Losses	(16,567)	(16,346)
Fair Value	1,158,064	1,015,542
Trust preferred securities
Schedule of Available-for-sale Securities
Amortized Cost	7,848	10,164
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,455)	(2,155)
Fair Value	6,393	8,009
Corporate and other debt securities
Schedule of Available-for-sale Securities
Amortized Cost	62,411	60,651
Gross Unrealized Gains	599	436
Gross Unrealized Losses	(293)	(522)
Fair Value	62,717	60,565
Equity securities
Schedule of Available-for-sale Securities
Amortized Cost	10,504	20,505
Gross Unrealized Gains	901	1,114
Gross Unrealized Losses	(465)	(761)
Fair Value	10,940	$ 20,858
Pooled Trust Preferred Securities
Schedule of Available-for-sale Securities
Amortized Cost	7,900
Fair Value	$ 6,400
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
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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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