Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 3,083,582	$ 2,679,727
Gross Unrealized Holding Gain	65,754	38,537
Gross Unrealized Holding Loss	(12,178)	(54,622)
Fair Value	3,137,158us-gaap_AvailableForSaleSecurities	2,663,642us-gaap_AvailableForSaleSecurities
Total Percent	100.00%	100.00%
CMO's / REMIC's - residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	297,318	361,573
Gross Unrealized Holding Gain	7,050	6,576
Gross Unrealized Holding Loss	(277)	(1,974)
Fair Value	304,091	366,175
Total Percent	9.69%	13.75%
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	557,823	571,145
Gross Unrealized Holding Gain	22,463	18,839
Gross Unrealized Holding Loss	(645)	(3,893)
Fair Value	579,641	586,091
Total Percent	18.48%	22.00%
Government agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	339,071	350,378
Gross Unrealized Holding Gain	0	22
Gross Unrealized Holding Loss	(8,228)	(23,875)
Fair Value	330,843	326,525
Total Percent	10.55%	12.26%
Residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,884,370	1,391,631
Gross Unrealized Holding Gain	36,154	13,100
Gross Unrealized Holding Loss	(3,028)	(24,788)
Fair Value	1,917,496	1,379,943
Total Percent	61.12%	51.81%
Other securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,000	5,000
Gross Unrealized Holding Gain	87	0
Gross Unrealized Holding Loss	0	(92)
Fair Value	$ 5,087	$ 4,908
Total Percent	0.16%	0.18%

Available for sale securities portfolio, percentage.

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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

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-Topic 210

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