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Loans and Allowance for Loan Losses - Loans on Nonaccrual Status (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Nonaccrual Loans $ 26,605 $ 27,796
Commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Nonaccrual Loans 15,562 16,349
Commercial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Nonaccrual Loans 317 472
Residential real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Nonaccrual Loans 5,117 5,622
Home equity loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Nonaccrual Loans 4,777 4,293
Indirect
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Nonaccrual Loans 517 711
Consumer
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Nonaccrual Loans $ 315 $ 349