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Loans and Allowance for Credit Losses Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision for credit losses $ 4,800 $ 1,530  
Impaired loans with principal balances approximately in percentage 67.00% 77.00%  
Loan to value ratio in the Corporation's policy 70.00%    
Recorded investment, with no related allowance $ 57,810   $ 60,457
Loans and Leases Receivable, Impaired, Commitment to Lend 3,600   $ 3,600
Minimum      
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    
Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum balance of loans evaluated individually for impairment $ 1,000