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Premises and Equipment and Lease Commitments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 380,209,000 $ 363,151,000  
Accumulated depreciation and amortization (114,649,000) (97,137,000)  
Property, Plant and Equipment, Net 265,560,000 266,014,000  
Depreciation and amortization expense 21,500,000 13,700,000 $ 9,900,000
Rent expense 12,400,000 11,900,000 $ 8,400,000
Capital Leases, Income Statement, Amortization Expense $ 225,000    
Capital lease interest rate 7.22%    
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 $ 12,889,000    
2020 11,805,000    
2021 11,527,000    
2022 9,410,000    
2023 8,820,000    
Thereafter 43,730,000    
Total 98,181,000    
Capital Leases, Future Minimum Payments Due, Rolling Maturity [Abstract]      
2019 470,000    
2020 470,000    
2021 470,000    
2022 470,000    
2023 479,000    
Thereafter 2,548,000    
Total minimum lease payments 4,907,000    
Less: amount representing interest (1,437,000)    
Present value of net minimum lease payments 3,470,000    
Land      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 64,898,000 65,649,000  
Building      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 170,829,000 164,748,000  
Building | Minimum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 15 years    
Building | Maximum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 30 years    
Leaseholds and Leasehold Improvements      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 43,536,000 38,913,000  
Leaseholds and Leasehold Improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 15 years    
Leaseholds and Leasehold Improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 20 years    
Furniture and Equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 100,946,000 $ 93,841,000  
Furniture and Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 3 years    
Furniture and Equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 20 years