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Significant Accounting Policies (Details)
$ in Thousands
3 Months Ended
Nov. 18, 2016
USD ($)
Branch
Mar. 31, 2017
USD ($)
Component
Category
Factor
Segment
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Business Acquisition [Line Items]        
Assets | $   $ 2,953,009 $ 2,922,121 $ 2,592,998
Investment Securities [Abstract]        
Number of components into which amount of impairment is split | Component   2    
Loans & Leases [Abstract]        
Consecutive months of payments to demonstrate sustained period of performance   6 months    
Allowance for Credit Losses [Abstract]        
Number of primary components of overall allowance for credit losses | Component   3    
Number of categories into which risk ratings are grouped | Category   5    
Segment Reporting [Abstract]        
Number of reportable segments | Segment   1    
Minimum [Member]        
Loans & Leases [Abstract]        
Period after which loans are placed on non accrual status   90 days    
Buildings [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful lives   30 years    
Buildings [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful lives   40 years    
Furniture and Equipment [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful lives   3 years    
Furniture and Equipment [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful lives   7 years    
Leasehold Improvements [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful lives   5 years    
Leasehold Improvements [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful lives   10 years    
Agricultural Real Estate [Member]        
Allowance for Credit Losses [Abstract]        
Number of risk factors on loans | Factor   2    
Agricultural [Member]        
Allowance for Credit Losses [Abstract]        
Number of risk factors on loans | Factor   2    
Delta National Bancorp [Member]        
Business Acquisition [Line Items]        
Assets | $ $ 112,000      
Number of branches | Branch 4