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Deposits (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Deposit [Line Items]    
2018 $ 461,207,000  
2019 123,397,000  
2020 35,235,000  
2021 20,045,000  
2022 15,368,000  
Thereafter 6,029,000  
Total certificates of deposit 661,281,000  
FDIC Insurance Limit 250,000  
Time Deposits, $250,000 or more 111,100,000 $ 137,100,000
Deposits from certain officers, directors, and their associated companies $ 16,200,000 $ 14,900,000
Deposit Liabilities, Collateral Issued, Description 443.1 434.6
Deposit Liabilities Reclassified as Loans Receivable $ 1,100,000 $ 897,000
Retail [Member]    
Deposit [Line Items]    
2018 250,838,000  
2019 116,397,000  
2020 35,235,000  
2021 20,045,000  
2022 15,368,000  
Thereafter 6,029,000  
Total certificates of deposit 443,912,000  
Brokered [Member]    
Deposit [Line Items]    
2018 210,369,000  
2019 7,000,000  
Total certificates of deposit $ 217,369,000