Pension and Other Post Retirement Benefit Plans - Narrative (Details) - USD ($) $ in Thousands			12 Months Ended
	Nov. 20, 2015	Mar. 01, 2005	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Percentage of employees covered by plan			20.00%
Minimum participant attained age		55 years
Requisite service period (at least)		10 years
Percentage of the premiums paid by plan participants			100.00%
Discount rate (as a percent)			4.50%	4.00%	4.80%
Defined benefit plan liability				$ 7,645
Accumulated benefit obligation			$ 71,747	80,650
Amount of discretionary contributions made by employer to defined contribution plan, percent			50.00%
Maximum annual contribution percentage per employee			6.00%
Requisite service period			1000 hours
Employer percentage contribution			2.00%
Vesting period			5 years
Expense recognized in the period			$ 3,526	3,396	$ 3,138
Obligations payable			1,403	1,811
Post retirement plan expense			(127)	97	519
Fair value of plan assets			71,396	77,139	$ 69,871
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			52,433	57,413
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			$ 18,963	$ 19,726
Ameriana | Pentegra Plan
Defined Benefit Plan Disclosure [Line Items]
Written notice of withdrawal, period	60 days
Defined benefit plan liability	$ 5,435
Minimum
Defined Benefit Plan Disclosure [Line Items]
Age of plan participants			55 years
Minimum | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Maturities of debt securities			15 days	15 days
Maximum
Defined Benefit Plan Disclosure [Line Items]
Age of plan participants			65 years
Maximum | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Maturities of debt securities			9 years 15 days	9 years 7 months 3 days
Weighted Average | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Maturities of debt securities			4 years 5 months 20 days	5 years 7 days