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Significant Events (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Unusual Or Infrequent Item [Line Items]      
Provision for (loan and lease losses, net $ 56,108,000 $ 113,139,000 $ 65,076,000
Insurance reimbursement 6,250,000    
Natural Disasters And Other Casualty Events [Member]      
Unusual Or Infrequent Item [Line Items]      
Provision for (loan and lease losses, net 0 32,400,000  
Estimated total losses   6,600,000  
Insurance reimbursement   $ 1,000,000  
Natural Disasters And Other Casualty Events [Member] | Other Nonoperating Income Expense [Member]      
Unusual Or Infrequent Item [Line Items]      
Insurance Settlements Receivable 5,000,000    
Natural Disasters And Other Casualty Events [Member] | Other Assets [Member]      
Unusual Or Infrequent Item [Line Items]      
Insurance Settlements Receivable $ 1,200,000