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Investment Securities - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Other investments	$ 34,047,000		$ 35,444,000
Amortized Cost	1,370,681,000		1,350,466,000
Available-for-sale Securities	1,351,039,000		1,318,365,000
Proceeds from the redemption of FHLB stock	7,976,000	2,756,000
Available-for-sale securities pledged as collateral	548,400,000		594,900,000
Corporate Debt Securities [Member]
Amortized Cost	6,691,000		6,693,000
Available-for-sale Securities	$ 7,128,000		$ 7,021,000

X

- 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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- Definition

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

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-Subparagraph (SX 210.5-02.2)

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- Definition

The fair value of available-for-sale securities that serve as collateral for borrowings.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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- Definition

Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

+ References

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-Topic 942

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Amount of cash inflow from sale of Federal Reserve Bank (FRB) stock.

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