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Subsequent events (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Mar. 31, 2019
Jul. 01, 2018
Mar. 31, 2018
Subsequent Event [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets       $ 332,283,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables       272,753,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities       $ 284,231,000  
Business Combination, Consideration Transferred   $ 86,203,000      
Stock Issued During Period, Shares, Acquisitions   435,457      
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   $ 48,519,000      
Payments to Acquire Businesses, Gross   30,684,000      
Deposits   $ 6,260,860,000 $ 6,325,212,000    
Business Acquisition, Share Price       $ 1.08  
Business Acquisition, Transaction Costs     $ 71,000   $ 169,000
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 757,100,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 590,800,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities 631,500,000        
Business Combination, Consideration Transferred $ 126,900,000        
Stock Issued During Period, Shares, Acquisitions 1,037,205        
Payments to Acquire Businesses, Gross $ 28,600,000        
Business Acquisition, Transaction Costs $ 200,000        
Common Stock [Member]          
Subsequent Event [Line Items]          
Business Acquisition, Share Price       $ 0.01023