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Employee Benefit Plans (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
plan
employee
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Defined contribution plan [Abstract]      
Defined contribution plan service period (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 $ 462,000 $ 454,000 $ 414,000
Defined benefit plans, general information The Bank also provides unfunded, non-qualified deferred compensation payable over two years, as well as 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 (years) 2 years    
Supplemental retirement benefits, period of benefits to be received 20 years    
Pension expense $ 312,000 722,000 $ 309,000
Accrued pension liability $ 3,088,000 $ 2,999,000  
Number of post-retirement benefit plans | plan 2    
Number of active employees aged 50 and over | employee 7    
Employee benefit plan age (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 2016 121,000    
Expected future benefit payments in 2017 122,000    
Expected future benefit payments in 2018 122,000    
Expected future benefit payments in 2019 122,000    
Expected future benefit payments in 2020 122,000    
Expected future benefit payments in 2021 through 2025 621,000    
Estimated plan expense $ 85,000    
Federal statutory income tax rate (percent) 35.00% 35.00% 35.00%