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Loans and Allowance for Credit Losses Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit losses $ 1,620 $ 5,075 $ 38,707 $ 16,575  
Loans charged off $ 6,883 $ 7,795 $ 55,440 $ 25,917  
Impaired loans with principal balances approximately in percentage     93.00%   94.00%
Loan to value ratio in the Corporation's policy 70.00%   70.00%    
Recorded investment, with no related allowance $ 68,863   $ 68,863   $ 75,111
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    
Commercial Relationship          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit losses 36,800   36,800    
Loans charged off $ 33,900   $ 33,900