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Securities (Details 2) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Securities available for sale, Amortized Cost    
Due within 1 year $ 129,136,000  
Due after 1 but within 5 years 69,706,000  
Due after 5 but within 10 years 27,354,000  
Due after 10 years 13,780,000  
Mortgage-backed securities 137,407,000  
Total securities available for sale 377,383,000  
Securities available for sale, Fair Value    
Due within 1 year 129,251,000  
Due after 1 but within 5 years 72,746,000  
Due after 5 but within 10 years 29,585,000  
Due after 10 years 13,977,000  
Mortgage-backed securities 140,881,000  
Total securities available for sale, fair value 386,440,000 352,185,000
Carrying value of securities pledged to secure the accounts of commercial depositors $ 158,200,000 $ 125,400,000
Maximum amount of holdings that consisted of a security issued by a single institution, except the issue made by US government and its agencies (as a percent) 10.00% 10.00%