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Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified			3 Months Ended		9 Months Ended
	Sep. 30, 2014 Securities	Dec. 31, 2013 Securities	Sep. 30, 2014 Four Structured Pool Trust Securities [Member] Securities	Sep. 30, 2013 Four Structured Pool Trust Securities [Member]	Sep. 30, 2014 Four Structured Pool Trust Securities [Member] Securities	Sep. 30, 2013 Four Structured Pool Trust Securities [Member]	Sep. 30, 2014 Pooled Trust Preferred [Member]	Dec. 31, 2013 Pooled Trust Preferred [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities holdings	0
Shareholders' equity percentage	10.00%
Number of pooled trust securities			1		1
Amortized Cost	$ 697,969	$ 697,738					$ 800	$ 800
Fair Value	699,366	685,991					871	661
Other than temporary impairment recognized in earnings for available for sale securities			0	0	0	0
Number of structured pooled trust preferred securities deemed to be other-than-temporarily impaired	4	4
Securities	$ 330,550	$ 353,102

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Number of pooled trust securities.

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Number of securities holdings.

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Other than temporarily impaired structured pooled trust preferred securities number.

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- Definition

Shareholders equity percentage.

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- Definition

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

+ References

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)

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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- Definition

The fair value of trading securities that serve as collateral for borrowings.

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-Name Accounting Standards Codification

-Topic 310

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