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Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jul. 14, 2017
May 19, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Goodwill $ 445,355     $ 244,000 $ 243,129
IAB          
Business Acquisition [Line Items]          
Cash and cash equivalents   $ 6,016      
Interest-bearing time deposits   248,212      
Investment securities   4,078      
Loans held for sale   594      
Loans   725,382      
Premises and equipment   10,107      
Federal Home Loan Bank stock   4,810      
Interest receivable   3,445      
Cash surrender value of life insurance   26,964      
Other assets   11,780      
Deposits   (862,271)      
Securities sold under repurchase agreements   (17,915)      
Federal Home Loan Bank Advances   (47,575)      
Subordinated debentures   (10,583)      
Interest payable   (1,005)      
Other liabilities   (14,472)      
Net tangible assets acquired   87,567      
Core deposit intangible   17,403      
Goodwill   153,636      
Purchase price   $ 258,606      
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     1,986    
Federal Home Loan Bank stock     1,091    
Interest receivable     653    
Other assets     1,620    
Deposits     (252,783)    
Interest payable     (244)    
Other liabilities     (3,106)    
Net tangible assets acquired     30,347    
Core deposit intangible     4,526    
Goodwill     47,719    
Purchase price     $ 82,592