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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Reserve for off-balance sheet credit exposures $ 459   $ 529
Recoveries through noninterest expense (70) (24)  
Mortgage Partnership Finance Program [Member]
     
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Sum of total loans sold under the MPF Program 60,511   61,862
Limited recourse debt 8,508   8,508
Charge (recovery) to other expenses $ 17 $ (26)