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Loans and Allowance for Credit Losses Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit losses $ 33,117 $ 6,700 $ 37,087 $ 11,500  
Loans charged off $ 42,160 $ 8,715 $ 48,557 $ 18,122  
Impaired loans with principal balances approximately in percentage     88.00% 87.00%  
Loan to value ratio in the Corporation's policy 70.00%   70.00%    
Recorded investment, with no related allowance $ 63,602   $ 63,602   $ 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