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Loans and Allowance for Credit Losses Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit losses $ 6,700 $ 2,511 $ 11,500 $ 4,041  
Impaired loans with principal balances approximately in percentage     87.00% 89.00%  
Loan to value ratio in the Corporation's policy 70.00%   70.00%    
Recorded investment, with no related allowance $ 71,695   $ 71,695   $ 60,457
Loans and Leases Receivable, Impaired, Commitment to Lend 2,600   2,600   $ 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   1,000    
Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Minimum balance of loans evaluated individually for impairment     $ 1,000