Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 2,954,443	$ 3,083,582
Gross Unrealized Holding Gain	79,997	65,754
Gross Unrealized Holding Loss	(6,151)	(12,178)
Fair Value	3,028,289us-gaap_AvailableForSaleSecurities	3,137,158us-gaap_AvailableForSaleSecurities
Total Percent	100.00%	100.00%
CMO's / REMIC's - residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	279,918	297,318
Gross Unrealized Holding Gain	8,406	7,050
Gross Unrealized Holding Loss	(80)	(277)
Fair Value	288,244	304,091
Total Percent	9.52%	9.69%
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	528,464	557,823
Gross Unrealized Holding Gain	21,910	22,463
Gross Unrealized Holding Loss	(530)	(645)
Fair Value	549,844	579,641
Total Percent	18.16%	18.48%
Government agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	334,025	339,071
Gross Unrealized Holding Gain	140	0
Gross Unrealized Holding Loss	(4,299)	(8,228)
Fair Value	329,866	330,843
Total Percent	10.89%	10.55%
Residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,807,036	1,884,370
Gross Unrealized Holding Gain	49,360	36,154
Gross Unrealized Holding Loss	(1,242)	(3,028)
Fair Value	1,855,154	1,917,496
Total Percent	61.26%	61.12%
Other securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,000	5,000
Gross Unrealized Holding Gain	181	87
Gross Unrealized Holding Loss	0	0
Fair Value	$ 5,181	$ 5,087
Total Percent	0.17%	0.16%

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.

+ References

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

-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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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