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Branch Acquisition (Narrative) (Details) - USD ($)
3 Months Ended
Aug. 25, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill   $ 889,000   $ 889,000
Acquisition related costs   4,000,000 $ 0  
Opus Bank [Member]        
Business Acquisition [Line Items]        
Retail deposits $ 74,700,000      
Deposit premium rate 3.125%      
Deposit premium, amount $ 2,500,000      
Fair Value of The Branch Owned 488,000      
Fixed assets 56,000      
Adjustments at Closing Date 14,000      
Cash payment to acquire business 71,600,000      
Core Deposits Intangible [Member] | Opus Bank [Member]        
Business Acquisition [Line Items]        
Finite-lived Intangible Assets Acquired   $ 1,300,000    
Goodwill $ 889,000