Investment Securities - Expected Maturities of Investment Securities Portfolio (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Available-for-Sale, Maturity, Within one year, Amortized Cost	$ 41,201
Available-for-Sale, Maturity, One to five years, Amortized Cost	449,141
Available-for-Sale, Maturity, Five to ten years, Amortized Cost	609,521
Available-for-Sale, Maturity, Beyond ten years, Amortized Cost	1,431,281
Available-for-Sale, Amortized Cost	2,531,144	2,629,128
Held-to-Maturity, Maturity, Within one year, Amortized Cost	77
Held-to-Maturity, Maturity, One to five years, Amortized Cost	29,107
Held-to-Maturity, Maturity, Five to ten years, Amortized Cost	187,953
Held-to-Maturity, Maturity, Beyond ten years, Amortized Cost	618,901
Held-to-Maturity, Amortized Cost	836,038us-gaap_HeldToMaturitySecurities	844,054us-gaap_HeldToMaturitySecurities	779,294us-gaap_HeldToMaturitySecurities
Available-for-Sale, Maturity, Within one year, Fair Value	41,405
Available-for-Sale, Maturity, One to five years, Fair Value	453,090
Available-for-Sale, Maturity, Five to ten years, Fair Value	616,780
Available-for-Sale, Maturity, Beyond ten years, Fair Value	1,434,195
Available-for-Sale securities, Fair Value	2,545,470	2,627,831	2,347,766
Held-to-Maturity, Maturity, Within one year, Fair Value	78
Held-to-Maturity, Maturity, One to five years, Fair Value	30,597
Held-to-Maturity, Maturity, Five to ten years, Fair Value	196,645
Held-to-Maturity, Maturity, Beyond ten years, Fair Value	672,333
Held-to-Maturity, Fair Value	$ 899,653	$ 903,935	$ 812,914
Available-for-Sale, Maturity, Within one year, Weighted Average Yield	1.50%
Available-for-Sale, Maturity, One to five years, Weighted Average Yield	1.72%
Available-for-Sale, Maturity, Five to ten years, Weighted Average Yield	2.24%
Available-for-Sale, Maturity, Beyond ten years, Weighted Average Yield	2.39%
Available-for-Sale, Weighted Average Yield	2.22%
Held-to-Maturity, Maturity, Within one year, Weighted Average Yield	3.64%
Held-to-Maturity, Maturity, One to five years, Weighted Average Yield	4.15%
Held-to-Maturity, Maturity, Five to ten years, Weighted Average Yield	3.43%
Held-to-Maturity, Maturity, Beyond ten years, Weighted Average Yield	5.52%
Held-to-Maturity, Weighted Average Yield	5.00%

Weighted average yield on available-for-sale securities maturing in five to ten years.

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- Definition

Weighted average yield on available-for-sale securities maturing in one to five years.

+ References

No definition available.

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Weighted average yield on available-for-sale securities maturing beyond ten years.

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Weighted average yield on total available-for-sale securities.

+ References

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Weighted average yield on available-for-sale securities maturing within one year.

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Weighted average yield on held-to-maturity securities maturing in five to ten years.

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Weighted average yield on held-to-maturity securities maturing in one to five years.

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Weighted average yield on held-to-maturity securities maturing beyond ten years.

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Weighted average yield on held-to-maturity securities maturing within one year.

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This item represents the cost of debt 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.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of held-to-maturity debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the fifth through tenth fiscal year following the latest fiscal year.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing after the tenth fiscal year following the latest fiscal year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 3

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- Definition

Fair value of held-to-maturity debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

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