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Deposits - Components of Outstanding Balances and Percentage Change in Deposits (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Deposits By Component Alternative [Abstract]    
Noninterest-bearing demand $ 224,580,000 $ 190,241,000
Interest-bearing checking 197,388,000 188,057,000
Money market 133,369,000 144,479,000
Savings 52,606,000 56,454,000
Time, under $100,000 43,251,000 51,730,000
Time, $100,000 and over 254,600,000 234,430,000
Total Local Deposits 905,794,000 865,391,000
Out-of-area interest-bearing checking 0 21,967,000
Out-of-area time, under $100,000 4,078,000 7,706,000
Out-of-area time, $100,000 and over 209,039,000 240,140,000
Total out-of-area deposits 213,117,000 269,813,000
Total deposits $ 1,118,911,000 $ 1,135,204,000
Percentage of Noninterest-bearing demand 20.10% 16.80%
Percentage of Interest-bearing checking 17.60% 16.50%
Percentage of Money market 11.90% 12.70%
Percentage of Savings 4.70% 5.00%
Percentage of time, under $100,000 3.90% 4.60%
Percentage of time, $100,000 and over 22.80% 20.60%
Percentage of total local deposits 81.00% 76.20%
Percentage of out-of-area interest-bearing checking    1.90%
Percentage of out-of-area time, under $100,000 0.40% 0.70%
Percentage of out-of-area time, $100,000 and over 18.60% 21.20%
Aggregate percentage of out-of-area deposits 19.00% 23.80%
Aggregate percentage of total deposits 100.00% 100.00%
Percentage of Increase or (Decrease) in Noninterest-bearing demand 18.10%  
Percentage of Increase or (Decrease) of Interest-bearing checking Deposits 5.00%  
Percentage of Increase or (Decrease) of Money market Deposits (7.70%)  
Percentage of Increase or (Decrease) of Savings Deposits (6.80%)  
Percentage of Increase or (Decrease) in Time, under $100,000 (16.40%)  
Percentage of Increase or (Decrease) in Time, $100,000 and over 8.60%  
Percentage of Increase or (Decrease) in Total Local Deposits 4.70%  
Percentage of Increase or (Decrease) in out-of-area interest-bearing checking     
Percentage of Increase or (Decrease) in out-of- area time, under $100,000 (47.10%)  
Percentage Increase or (Decrease) in out-of-area time, $100,000 and over (13.00%)  
Aggregate Percentage Increase or (Decrease) in out-of-area deposits (21.00%)  
Aggregate Percentage Increase or (Decrease) in Total Deposits (1.40%)