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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 01, 2017
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]        
Goodwill   $ 19,580 $ 19,580 $ 6,308
Core deposit intangibles        
Finite-Lived Intangible Assets [Line Items]        
Amortization period   10 years    
RIG        
Finite-Lived Intangible Assets [Line Items]        
Goodwill   $ 6,308    
RIG | Customer lists        
Finite-Lived Intangible Assets [Line Items]        
Amortization period   10 years    
Gross carrying amount of intangible asset   $ 7,263    
Accumulated amortization of intangible asset   6,372    
New Windsor        
Finite-Lived Intangible Assets [Line Items]        
Goodwill $ 13,272 $ 13,272    
New Windsor | Core deposit intangibles        
Finite-Lived Intangible Assets [Line Items]        
Amortization period 10 years 10 years    
Gross carrying amount of intangible asset   $ 2,418    
Accumulated amortization of intangible asset   $ 330    
Minimum | Customer lists        
Finite-Lived Intangible Assets [Line Items]        
Amortization period   8 years    
Maximum | Customer lists        
Finite-Lived Intangible Assets [Line Items]        
Amortization period   13 years