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Securities - Additional Information (Detail) (USD $)	Jun. 30, 2014 Securities	Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]
Carrying value of pledged securities	$ 83,600,000	$ 87,900,000
Restricted stock investment in FHLB stock	4,100,000	5,000,000
Federal Reserve Bank stock	$ 471,000	$ 471,000
Number of securities in unrealized loss position	44
Number of securities in continuous loss position	34

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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