Securities - Additional Information (Detail) (USD $)	6 Months Ended
Jun. 30, 2014 Holdings	Jun. 30, 2013	Dec. 31, 2013 Holdings	Dec. 31, 2012
Amortized Cost And Fair Value Debt Securities [Abstract]
Maximum percentage of equity of one issuer	10.00%
Number of holdings greater than specified percentage of equity	0		0
Securities with aggregate fair values	$ 707,500,000		$ 701,700,000
Proceeds from sale of available-for-sale securities	3,491,000	9,265,000
Net unrealized gains (losses) on available-for-sale securities included in AOCI	911,000	1,424,000	(6,126,000)	13,032,000
Impaired loss relating to securities	0
Federal home loan bank stock, Total	$ 15,000,000		$ 11,600,000

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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- Definition

The carrying amount, as of the date of the latest financial statement presented, of other assets which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

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-Paragraph 1A

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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Impaired loss relating to securities.

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- Definition

The maximum percentage of shareholders' equity of any one issuer other than the U.S. government and its agencies.

+ References

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Number of holdings greater than specified percentage of equity.

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