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Acquisition - Narrative (Details)
$ in Thousands
 12 Months Ended
Apr. 03, 2017
USD ($)
branch
shares
Dec. 02, 2016
USD ($)
branch
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Net of Cash Acquired     $ (3,188) $ (479,469) $ 3,533
Goodwill, Acquired During Period     68,900    
Costs related to the acquisition     10,213 3,173 $ 922
Goodwill     255,353 $ 186,500  
FirstMerit Bank, NA, Branch Acquisition [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   $ 122,766      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits   619,729      
Goodwill, Acquired During Period   1,600      
Total consideration received   (476,555)      
Credit market adjustment of gross loans acquired   $ 105,600      
Number of Stores | branch   13      
Loans   $ 102,097      
Goodwill   20,478      
Business Combination, Acquired Receivables, Fair Value Adjustment   $ 3,530      
DCB Financial Acquisition [Member]          
Business Acquisition [Line Items]          
Costs related to the acquisition     $ 10,198    
DCB Financial Corp [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Net of Cash Acquired $ 21,232        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares 8,356,882        
Number of Full Service Branches | branch 9        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 554,890        
Business Combination, Acquired Receivables, Gross Contractual Amount 390,760        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits 484,366        
Goodwill, Acquired During Period 70,600        
Total consideration received $ 132,044        
Number of Limited Service Branches | branch 4        
Loans $ 383,083        
Business Combination, Acquired Receivables, Fair Value Adjustment $ 7,677