Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 plan employee	Dec. 31, 2013	Dec. 31, 2012
Defined contribution plan [Abstract]
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	$ 454,000	$ 414,000	$ 363,000
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.
Supplemental retirement benefits, period of benefits to be received	20 years
Pension expense	722,000	309,000	289,000
Accrued pension liability	2,999,000	2,333,000
Number of post-retirement benefit plans	2
Number of active employees aged 50 and over	7
Employee Benefit Plan, Requisite Minimum Age	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 2015	120,000
Expected future benefit payments in 2016	121,000
Expected future benefit payments in 2017	122,000
Expected future benefit payments in 2018	123,000
Expected future benefit payments in 2019	123,000
Expected future benefit payments in 2020 through 2024	590,000
Estimated plan expense	$ 80,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%