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Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]    
Balance at the beginning of the period $ 92,623,000 $ 91,792,000
Goodwill related to sale of portion of business unit (332,000) (318,000)
Balance at the end of the period 92,291,000 92,623,000
Reduction of goodwill 332,000 318,000
Impairment of goodwill and intangible assets 0  
Banking    
Goodwill [Roll Forward]    
Balance at the beginning of the period 64,369,000 64,369,000
Goodwill related to sale of portion of business unit 0 0
Balance at the end of the period 64,369,000 64,369,000
Reduction of goodwill 0 0
Insurance    
Goodwill [Roll Forward]    
Balance at the beginning of the period 20,043,000 19,212,000
Goodwill related to sale of portion of business unit (332,000) (318,000)
Balance at the end of the period 19,711,000 20,043,000
Reduction of goodwill 332,000 318,000
Wealth Management    
Goodwill [Roll Forward]    
Balance at the beginning of the period 8,211,000 8,211,000
Goodwill related to sale of portion of business unit 0 0
Balance at the end of the period 8,211,000 8,211,000
Reduction of goodwill $ 0 $ 0