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Loans and Allowance for Credit Losses Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for Loan and Lease Losses $ 1,000 $ 3,500 $ (500) $ 9,500  
Allowance for Loan and Lease Losses, Period Increase (Decrease)     $ 10,000    
Impaired loans with principal balances approximately in percentage     77.00%    
Loan to value ratio in the Corporation's policy 70.00%   70.00%    
Recorded investment, with no related allowance $ 61,583   $ 61,583   $ 59,073
TDR additional commitments to lend 5,300   5,300   $ 3,900
Maximum [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Minimum balance of loans evaluated individually for impairment     1,000    
Minimum [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Minimum balance of loans evaluated individually for impairment     1,000    
Impaired loans balances, real estate as collateral $ 1,000   $ 1,000