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Loans and Allowance for Credit Losses Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit losses $ 5,025 $ 33,117 $ 10,125 $ 37,087  
Loans charged off $ 3,711 $ 42,160 $ 10,080 $ 48,557  
Impaired loans with principal balances approximately in percentage     84.00% 89.00%  
Loan to value ratio in the Corporation's policy 70.00%   70.00%    
Recorded investment, with no related allowance $ 78,924   $ 78,924   $ 77,566
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