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Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
May 19, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill $ 292,188   $ 244,000 $ 243,129
Arlington Bank        
Business Acquisition [Line Items]        
Cash and cash equivalents   $ 48,532    
Interest-bearing time deposits   292    
Loans held for sale   7,626    
Loans   224,680    
Premises and equipment   1,266    
Federal Home Loan Bank stock   1,091    
Interest receivable   653    
Other assets   1,871    
Deposits   (252,783)    
Interest payable   (244)    
Other liabilities   (3,106)    
Net tangible assets acquired   29,878    
Core deposit intangible   4,526    
Goodwill   48,188    
Purchase price   $ 82,592