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Loans and Allowance for Credit Losses Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit losses $ 4,141 $ 1,000 $ 8,182 $ (500)  
Impaired loans with principal balances approximately in percentage     73.00% 77.00%  
Loan to value ratio in the Corporation's policy 70.00%   70.00%    
Recorded investment, with no related allowance $ 68,183   $ 68,183   $ 49,953
TDR additional commitments to lend 3,500   3,500   $ 5,300
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    
Maximum [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Minimum balance of loans evaluated individually for impairment     $ 1,000