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Employees' Benefit Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Eligibility Of Employees | Employees are eligible to participate in the Employees Savings and Profit Sharing Plan and Trust on the next January 1 or July 1 following the completion of one year of employment, attaining age 18, and completion of 1,000 hours of service. |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 8.00% | 8.00% |  |
Defined Contribution Plan, Cost Recognized | $ 705 | $ 599 |  |
Deferred Compensation Liability, Current and Noncurrent | 188 | 171 |  |
Deferred Compensation Arrangement with Individual, Compensation Expense | 17 | 15 |  |
Deferred Costs | 97 | 106 |  |
Deferred Fee Liability | $ 1,340 | $ 1,300 |  |
Defined Benefit Plan, Funded Percentage | 91.47% | 94.17% |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 1,500 |  |  |
Trust for Benefit of Employees [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Description of Defined Contribution Pension and Other Postretirement Plans | Participants also become 100% vested in the employer contributions and accrued earnings in their account upon their death, approved disability, or attainment of age 65 while employed at the Bank. |  |  |
Two Years Of Service [Member] | Trust for Benefit of Employees [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Funded Percentage | 40.00% |  |  |
Three Years Of Service [Member] | Trust for Benefit of Employees [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Funded Percentage | 60.00% |  |  |
Four Years Of Service [Member] | Trust for Benefit of Employees [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Funded Percentage | 80.00% |  |  |
Five Years Of Service [Member] | Trust for Benefit of Employees [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Funded Percentage | 100.00% |  |  |
Pentegra DB Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Contribution Plan, Cost Recognized |  |  | $ 190,800 | $ 136,500
Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Employees Pre Tax Contributions | 50.00% |  |  |
Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Employees Pre Tax Contributions | 1.00% |  |  |

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- Definition Maximum amount, that the employee may contribute to a defined contribution plan before tax payments. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Defined Contribution Plan -URI http://asc.fasb.org/extlink&oid=49180617 + Details
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