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Nature of Operations and Summary of Significant Accounting Policies (Details Textual)
9 Months Ended
Sep. 30, 2018
USD ($)
quarter
step
operating_segment
division
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Number of Bank Divisions | division 14    
Number of Operating Segments | operating_segment 1    
Minimum Period Past Due to Consider Loan as Delinquent 30 days    
Minimum Period Past Due to Consider Loan as Non Accrual 90 days    
Number of Quarters Used to Evaluate Historical Loss Experience | quarter 12    
Revenue from Contracts with Customers $ 56,519,000 $ 52,058,000  
Impairment losses on receivables related to contracts with customers $ 0   $ 0
Number of Steps to Achieve Core Revenue Recognition Principal | step 5    
Accounting Standards Update 2017-08      
Effect of cumulative change on retained earnings from applying new accounting pronouncement $ 22,612,000    
Consumer and Other      
Minimum Number of Days Delinquent to Charge off Loans 120 days    
Minimum Range      
Number of years for home equity loan origination term 10 years    
Maximum Range      
Number of years for home equity loan origination term 15 years