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Summary of Significant Accounting Policies (Details Narrative)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Reserve requirements for banking subsidiaries $ 6,600,000 $ 6,600,000 $ 5,400,000  
Number of reportable business segments | segment   3    
Tax expense (benefit)   $ 27,045,000 28,962,000 $ 25,404,000
Adoption of ASU 2014-01 investments accounting for investments in qualified affordable housing projects     725,000  
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount $ 1,400,000      
Buildings | Minimum        
Estimated useful (in years)   10 years    
Buildings | Maximum        
Estimated useful (in years)   39 years    
Furniture, fixtures, and equipment | Minimum        
Estimated useful (in years)   2 years    
Furniture, fixtures, and equipment | Maximum        
Estimated useful (in years)   20 years    
Core deposit intangible | Minimum        
Amortization period for other intangible assets (in years)   5 years    
Core deposit intangible | Maximum        
Amortization period for other intangible assets (in years)   10 years    
Covenants Noncompete | Minimum        
Amortization period for other intangible assets (in years)   3 years    
Covenants Noncompete | Maximum        
Amortization period for other intangible assets (in years)   6 years    
Customer relationships | Minimum        
Amortization period for other intangible assets (in years)   6 years    
Customer relationships | Maximum        
Amortization period for other intangible assets (in years)   15 years    
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09, Statutory Tax Withholding Component        
Net Cash Provided by (Used in) Operating Activities     $ 358,000 $ 234,000