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Premises and Equipment and Lease Commitments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 363,151,000 $ 175,326,000  
Accumulated depreciation and amortization (97,137,000) (86,422,000)  
Property, Plant and Equipment, Net 266,013,608 88,904,145  
Depreciation and amortization expense 13,700,000 9,900,000 $ 8,500,000
Rent expense 11,700,000 8,400,000 $ 5,900,000
Capital Leases, Income Statement, Amortization Expense $ 225,000    
Capital lease interest rate 7.22%    
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 $ 12,226,000    
2019 11,535,000    
2020 10,949,000    
2021 10,652,000    
2022 8,429,000    
Thereafter 42,857,000    
Total 96,648,000    
Capital Leases, Future Minimum Payments Due, Rolling Maturity [Abstract]      
2018 426,000    
2019 470,000    
2020 470,000    
2021 470,000    
2022 470,000    
Thereafter 3,028,000    
Total minimum lease payments 5,334,000    
Less: amount representing interest (1,695,000)    
Present value of net minimum lease payments 3,639,000    
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 65,649,000 19,467,000  
Building [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 164,748,000 64,088,000  
Building [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 15 years    
Building [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 30 years    
Leaseholds and Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 38,913,000 28,789,000  
Leaseholds and Leasehold Improvements [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 15 years    
Leaseholds and Leasehold Improvements [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 20 years    
Furniture and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 93,841,000 $ 62,982,000  
Furniture and Equipment [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 3 years    
Furniture and Equipment [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 20 years