Regulatory Matters (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Consolidated [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital Actual (in dollars)	$ 250,847	[1]	$ 246,258	[2]
Tier 1 Capital Minimum Required for Adequately Capitalized (in dollars)	84,397	[1]	83,045	[2]
Tier 1 Capital Actual (Ratio)	11.89%	[1]	11.86%	[2]
Tier 1 Capital Minimum Required for Adequately Capitalized (Ratio)	4.00%	[1]	4.00%	[2]
Tier 1 Capital (to Risk Weighted Assets) Actual (in dollars)	250,847	[1]	246,258	[2]
Tier 1 Capital (to Risk Weighted Assets) Minimum Required for Adequately Capitalized (in dollars)	72,213	[1]	70,473	[2]
Tier 1 Capital (to Risk Weighted Assets) Actual (Ratio)	13.89%	[1]	13.98%	[2]
Tier 1 Capital (to Risk Weighted Assets) Minimum Required for Adequately Capitalized (Ratio)	4.00%	[1]	4.00%	[2]
Total Capital (to Risk Weighted Assets) Actual (in dollars)	273,441	[1]	268,317	[2]
Total Capital (to Risk Weighted Assets) Minimum Required for Adequately Capitalized (in dollars)	144,426	[1]	140,947	[2]
Total Capital (to Risk Weighted Assets) Actual (Ratio)	15.15%	[1]	15.23%	[2]
Total Capital (to Risk Weighted Assets) Minimum Required for Adequately Capitalized (Ratio)	8.00%	[1]	8.00%	[2]
First Federal [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital Actual (in dollars)	238,221	[1]	235,699	[2]
Tier 1 Capital Minimum Required for Adequately Capitalized (in dollars)	84,278	[1]	82,978	[2]
Tier 1 Capital Minimum Required for Well Capitalized (in dollars)	105,347	[1]	103,722	[2]
Tier 1 Capital Actual (Ratio)	11.31%	[1]	11.36%	[2]
Tier 1 Capital Minimum Required for Adequately Capitalized (Ratio)	4.00%	[1]	4.00%	[2]
Tier 1 Capital Minimum Required for Well Capitalized (Ratio)	5.00%	[1]	5.00%	[2]
Tier 1 Capital (to Risk Weighted Assets) Actual (in dollars)	238,221	[1]	235,699	[2]
Tier 1 Capital (to Risk Weighted Assets) Minimum Required for Adequately Capitalized (in dollars)	72,136	[1]	70,418	[2]
Tier 1 Capital (to Risk Weighted Assets) Minimum Required for Well Capitalized (in dollars)	108,204	[1]	105,627	[2]
Tier 1 Capital (to Risk Weighted Assets) Actual (Ratio)	13.21%	[1]	13.39%	[2]
Tier 1 Capital (to Risk Weighted Assets) Minimum Required for Adequately Capitalized (Ratio)	4.00%	[1]	4.00%	[2]
Tier 1 Capital (to Risk Weighted Assets) Minimum Required for Well Capitalized (Ratio)	6.00%	[1]	6.00%	[2]
Total Capital (to Risk Weighted Assets) Actual (in dollars)	260,791	[1]	257,741	[2]
Total Capital (to Risk Weighted Assets) Minimum Required for Adequately Capitalized (in dollars)	144,272	[1]	140,836	[2]
Total Capital (to Risk Weighted Assets) Minimum Required for Well Capitalized (in dollars)	$ 180,340	[1]	$ 176,046	[2]
Total Capital (to Risk Weighted Assets) Actual (Ratio)	14.46%	[1]	14.64%	[2]
Total Capital (to Risk Weighted Assets) Minimum Required for Adequately Capitalized (Ratio)	8.00%	[1]	8.00%	[2]
Total Capital (to Risk Weighted Assets) Minimum Required for Well Capitalized (Ratio)	10.00%	[1]	10.00%	[2]

[1] Core capital is computed as a percentage of adjusted total assets of $2.11 billion and $2.11 billion for consolidated and the bank, respectively. Risk-based capital is computed as a percentage of total risk-weighted assets of $1.81 billion and $1.80 billion for consolidated and the bank, respectively.

[2] Core capital is computed as a percentage of adjusted total assets of $2.00 billion and $1.99 billion for consolidated and the bank, respectively. Risk-based capital is computed as a percentage of total risk-weighted assets of $1.64 billion and $1.64 billion for consolidated and the bank, respectively.