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Stock Compensation (Narrative) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May. 21, 2015 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of options outstanding |  |  | 721,924 | 540,404 | 309,439 | 311,153
Unrecognized compensation expense related to stock options |  |  | $ 370,000 |  |  |
Aggregate intrinsic value of options outstanding |  |  | 0 |  |  |
Intrinsic value of all options exercised |  |  | 10,000 | $ 40,000 | $ 38,000 |
Net cash proceeds from exercise of stock options |  |  | 0 | 99,000 | 110,000 |
Excess tax benefits from exercise of stock options |  |  | 4,000 | 14,000 | 14,000 |
Share based compensation expense before income taxes |  |  | 899,000 | 785,000 | (81,000) |
Share based compensation expense after income taxes |  |  | $ 584,000 | $ 510,000 | (53,000) |
Shares of ESOP allocated to accounts of eligible employees |  |  | 577,965 |  |  |
Shares issued under ESOP |  |  | 37,640 | 32,520 |  |
ESOP contributions |  |  | $ 467,731 | $ 395,220 | $ 362,273 |
Scenario, Forecast [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued under ESOP |  | 60,197 |  |  |  |
2011 Executive Incentive Compensation Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of awards authorized | 1,000,000 |  |  |  |  |
Number of additional awards authorized | 2,000,000 |  |  |  |  |
Number of options granted |  |  | 248,258 |  |  |
Award expiration period |  |  | 7 years |  |  |
Awards eligible for grant |  |  | 1,120,376 |  |  |
Shares issued under Plan |  |  | 95,465 |  |  |
Number of options outstanding |  |  | 784,159 |  |  |
2011 Executive Incentive Compensation Plan [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  | 25.00% |  |  |
1992 Stock Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards eligible for grant |  |  | 22,008 |  |  |
Employee Stock Ownership Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 6 years |  |  |
Initial award vesting period |  |  | 2 years |  |  |
Requisite service period |  |  | 1 year |  |  |
Employee Stock Ownership Plan [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  | 20.00% |  |  |
Non-Employee Directors [Member] | Stock Option Plan For Directors [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of options granted |  |  | 0 | 0 | 0 |
Award expiration period |  |  | 10 years |  |  |
Number of shares automatically granted to each non-employee director |  |  | 3,000 |  |  |
Employee Stock Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Recognition period for unrecognized compensation expense |  |  | 2 years 2 months 12 days |  |  |
Deferred Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards granted |  |  | 103,017 | 48,824 | 222,654 |
Unrecognized compensation expense for awards |  |  | $ 348,000 |  |  |
Recognition period for unrecognized compensation expense |  |  | 1 year 9 months 18 days |  |  |
Deferred Stock [Member] | Key Employees [Member] | 2011 Executive Incentive Compensation Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards granted |  |  | 100,017 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards granted |  |  | 20,979 | 13,973 | 31,354 |
Unrecognized compensation expense for awards |  |  | $ 59,000 |  |  |
Recognition period for unrecognized compensation expense |  |  | 4 months 24 days |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of price of common stock at which employees are able to acquire |  |  | 85.00% |  |  |
Awards eligible for grant |  |  | 101,240 |  |  |

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