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Allowance for Loan and Lease Losses (Narrative) (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
USD ($)
Financing Receivable, Recorded Investment [Line Items]  
Special provision due to hurricane $ 27,000
Special provision due to hurricane, originated loans portfolio 16,800
Special provision due to hurricane, originated mortgage loans portfolio 3,800
Special provision due to hurricane, originated auto loans portfolio 4,600
Special provision due to hurricane, originated commercial loans portfolio 7,600
Special provision due to hurricane, originated consumer loans portfolio 800
Special provision due to hurricane, acquired loans portfolio 10,200
Special provision due to hurricane, acquired mortgage loans portfolio 2,700
Special provision due to hurricane, acquired commercial loans portfolio 7,000
Special provision due to hurricane, acquired consumer loans portfolio 100
Special provision due to hurricane, acquired auto loans portfolio $ 400