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Investment Securities - Unrealized losses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 110,926 $ 107,128
Less than 12 Months, Unrealized Losses (1,217) (1,101)
12 Months or More, Fair Value 20,910 7,515
12 Months or More, Unrealized Losses (504) (1,565)
Total Fair Value 131,836 114,643
Total Unrealized Losses (1,721) (2,666)
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 3,590  
Less than 12 Months, Unrealized Losses (23)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total Fair Value 3,590  
Total Unrealized Losses (23)  
Obligations of states and political subdivisions
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 30,572 1,194
Less than 12 Months, Unrealized Losses (385) (20)
12 Months or More, Fair Value 0 2,598
12 Months or More, Unrealized Losses 0 (311)
Total Fair Value 30,572 3,792
Total Unrealized Losses (385) (331)
U.S. Government agencies collateralized by residential mortgage obligations
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 76,764 105,902
Less than 12 Months, Unrealized Losses (809) (1,080)
12 Months or More, Fair Value 18,024 0
12 Months or More, Unrealized Losses (298) 0
Total Fair Value 94,788 105,902
Total Unrealized Losses (1,107) (1,080)
Private label residential mortgage backed securities
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 0 32
Less than 12 Months, Unrealized Losses 0 (1)
12 Months or More, Fair Value 2,886 4,917
12 Months or More, Unrealized Losses (206) (1,254)
Total Fair Value 2,886 4,949
Total Unrealized Losses $ (206) $ (1,255)