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Acquisition of IA Bancorp, Inc. (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 17, 2018
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]        
Merger related costs   $ 2,039,000 $ 2,184,000  
Certificates of Deposit [Member]        
Business Acquisition [Line Items]        
Amortization period of fair value adjustment     5 years  
IA Bancorp [Member]        
Business Acquisition [Line Items]        
Share exchange rate 0.189      
Fair value adjustment on pools of homogeneous loans, interest rate discount     $ 1,900,000  
Fair value adjustment on pools of homogeneous loans, credit discount     3,900,000  
Merger related costs     2,200,000 $ 800,000
Merger related costs, early termination fees     2,000,000  
IA Bancorp [Member] | Certificates of Deposit [Member]        
Business Acquisition [Line Items]        
Fair value adjustment, liabilities     $ 751,000