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Deposits - Components of Outstanding Balances and Percentage Change in Deposits (Detail) (USD $)
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Deposits By Component Alternative [Abstract]    
Noninterest-bearing demand $ 216,055,000 $ 190,241,000
Interest-bearing checking 195,964,000 188,057,000
Money market 136,363,000 144,479,000
Savings 52,993,000 56,454,000
Time, under $100,000 45,146,000 51,730,000
Time, $100,000 and over 257,651,000 234,430,000
Total Local Deposits 904,172,000 865,391,000
Out-of-area interest-bearing checking 0 21,967,000
Out-of-area time, under $100,000 4,672,000 7,706,000
Out-of-area time, $100,000 and over 212,665,000 240,140,000
Total out-of-area deposits 217,337,000 269,813,000
Total deposits $ 1,121,509,000 $ 1,135,204,000
Percentage of Noninterest-bearing demand 19.30% 16.80%
Percentage of Interest-bearing checking 17.50% 16.50%
Percentage of Money market 12.10% 12.70%
Percentage of Savings 4.70% 5.00%
Percentage of time, under $100,000 4.00% 4.60%
Percentage of time, $100,000 and over 23.00% 20.60%
Percentage of total local deposits 80.60% 76.20%
Percentage of out-of-area interest-bearing checking 0.00% 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 19.00% 21.20%
Aggregate percentage of out-of-area deposits 19.40% 23.80%
Aggregate percentage of total deposits 100.00% 100.00%
Percentage of Increase or (Decrease) in Noninterest-bearing demand 13.60%  
Percentage of Increase or (Decrease) of Interest-bearing checking Deposits 4.20%  
Percentage of Increase or (Decrease) of Money market Deposits (5.60%)  
Percentage of Increase or (Decrease) of Savings Deposits (6.10%)  
Percentage of Increase or (Decrease) in Time, under $100,000 (12.70%)  
Percentage of Increase or (Decrease) in Time, $100,000 and over 9.90%  
Percentage of Increase or (Decrease) in Total Local Deposits 4.50%  
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 (39.40%)  
Percentage Increase or (Decrease) in out-of-area time, $100,000 and over (11.40%)  
Aggregate Percentage Increase or (Decrease) in out-of-area deposits (19.40%)  
Aggregate Percentage Increase or (Decrease) in Total Deposits (1.20%)