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Employee Benefit Plans (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
plan
employee
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Defined contribution plan [Abstract]      
Defined contribution plan service period (in months) 3 months    
Defined contribution plan employer maximum percentage match of annual salary based on employee contribution (in hundredths) 3.00%    
Defined contribution plan employer maximum percentage of annual profit-sharing contribution to plan for benefit of employee (in hundredths) 2.00% 2.00% 2.00%
Expense related to 401(k) plan $ 554,000 $ 435,000 $ 462,000
Defined benefit plans, general information The Bank also provides unfunded supplemental retirement benefits for certain officers, payable in installments over 20 years upon retirement or death. The agreements consist of individual contracts with differing characteristics that, when taken together, do not constitute a post-retirement plan.    
Non-qualified deferred compensation payable period (in years) 2 years    
Supplemental retirement benefits, period of benefits to be received 20 years    
Pension expense $ 219,000 215,000 $ 312,000
Accrued pension liability $ 3,060,000 $ 3,073,000  
Number of post-retirement benefit plans | plan 2    
Number of active employees aged 50 and over | employee 7    
Employee benefit plan age (in years) 50 years    
Post-retirement benefit plan health insurance subsidy range minimum per month per person $ 40    
Post-retirement benefit plan health insurance subsidy range maximum per month per person 1,200    
Expected future benefit payments in 2018 128,000    
Expected future benefit payments in 2019 128,000    
Expected future benefit payments in 2020 127,000    
Expected future benefit payments in 2021 126,000    
Expected future benefit payments in 2022 124,000    
Expected future benefit payments in 2022 through 2026 636,000    
Estimated plan expense $ 77,000    
Federal statutory income tax rate (percent) 35.00% 35.00% 35.00%