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Leases - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating lease liability incurred for right of use asset $ 5,636  
Right of use assets 41,200  
Operating lease liability 42,166  
Real property leases not yet commenced 15,800  
2019   $ 7,300
2020   6,200
2021   5,100
2022   4,800
2023   4,400
2024   12,100
Premises and equipment 122,452 $ 123,442
Underlying assets under operating leases $ 15,300  
Minimum    
Lessee, Lease, Description [Line Items]    
Lease term 1 year  
Renewal term 3 years  
Maximum    
Lessee, Lease, Description [Line Items]    
Lease term 16 years  
Renewal term 5 years