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Loans and Allowance for Credit Losses Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit losses $ 2,170 $ 1,620 $ 12,295 $ 38,707  
Loans charged off $ 10,128 $ 6,883 $ 20,208 $ 55,440  
Impaired loans with principal balances approximately in percentage     73.00% 89.00%  
Loan to value ratio in the Corporation's policy 70.00%   70.00%    
Recorded investment, with no related allowance $ 74,742   $ 74,742   $ 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