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Loans and Leases - 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]          
Residual value of leased assets $ 263,300   $ 263,300    
Depreciation and amortization     207,954 $ 153,018  
Premises and equipment, net 554,194   554,194   $ 427,534
Impairment charges on interest-only strips 22 $ 45 43 $ 700  
Premises and equipment leased under capital leases          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Depreciation and amortization 19,400   57,800    
Premises and equipment, net $ 285,400   $ 285,400