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Acquisition Activities - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jan. 01, 2018
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]      
Closing price $ 32.43    
Acquisition related expenses     $ (7,957)
Amortization of acquired identifiable intangibles   $ 296 653
Peoples Inc [Member]      
Business Acquisition [Line Items]      
Cash $ 36,189    
Cash consideration 3,398,477    
Restricted cash placed in escrow $ 10,000    
Restricted Cash, Asset, Statement of Financial Position [Extensible List]   Other Assets [Member]  
Transaction value 146,402    
Mortgage repurchase reserve 4,000    
Gross contractual amounts receivable 713,600    
Loans not expected to be collected $ 2,100    
Acquisition related expenses     $ 7,600