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Fair Value - Carrying Amount and Estimated Fair Value of Finanical Instruments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 61,470	$ 59,581	$ 92,925	$ 160,957
Financial assets
Securities, carrying amount	104,242	121,174
Loans receivable, net of allowance for loan losses, carrying amounts	1,162,298	1,172,356
FHLBC stock, carrying amount	6,257	6,257
Accrued interest receivable, carrying amount	4,000	3,926
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets
Available-for-sale Securities, Fair Value Disclosure	104,242	121,174
Loans Receivable, Fair Value Disclosure	1,161,317	1,170,525
Accounts Receivable, Fair Value Disclosure	4,000	3,926
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	61,470	59,581
Demand Deposit Accounts Fair Value Disclosure	233,192	134,129
Deposits Savings Deposits Fair Value Disclosure	152,585	154,532
Now Money Market Accounts Fair Value Disclosure	572,860	690,193
Certificates Of Deposit Fair Value Disclosure	222,878	232,588
Short Term Borrowings Fair Value Disclosure	18,049	12,908
Accrued Liabilities, Fair Value Disclosure	46	89
Estimate of Fair Value, Fair Value Disclosure [Member] \| Level 1 [Member]
Financial assets
Loans Receivable, Fair Value Disclosure		0
Accounts Receivable, Fair Value Disclosure		0
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	8,809	9,693
Demand Deposit Accounts Fair Value Disclosure		0
Deposits Savings Deposits Fair Value Disclosure		0
Now Money Market Accounts Fair Value Disclosure		0
Certificates Of Deposit Fair Value Disclosure		0
Short Term Borrowings Fair Value Disclosure		0
Accrued Liabilities, Fair Value Disclosure		0
Estimate of Fair Value, Fair Value Disclosure [Member] \| Level 2 [Member]
Financial assets
Available-for-sale Securities, Fair Value Disclosure	103,730	120,665
Loans Receivable, Fair Value Disclosure	1,159,706	1,166,181
Accounts Receivable, Fair Value Disclosure	4,000	3,926
Financial liabilities
Cash and Cash Equivalents, Fair Value Disclosure	52,661	49,888
Demand Deposit Accounts Fair Value Disclosure	233,192	134,129
Deposits Savings Deposits Fair Value Disclosure	152,585	154,532
Now Money Market Accounts Fair Value Disclosure	572,860	690,193
Certificates Of Deposit Fair Value Disclosure	222,878	232,588
Short Term Borrowings Fair Value Disclosure	18,049	12,908
Accrued Liabilities, Fair Value Disclosure	46	89
Estimate of Fair Value, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 3 [Member]
Financial assets
Loans Receivable, Fair Value Disclosure	1,611	4,344
Reported Value Measurement [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Cash and Cash Equivalents, at Carrying Value	61,470	59,581
Financial assets
Securities, carrying amount	104,242	121,174
Loans receivable, net of allowance for loan losses, carrying amounts	1,162,298	1,172,356
FHLBC stock, carrying amount	6,257	6,257
Accrued interest receivable, carrying amount	4,000	3,926
Financial liabilities
Demand Deposit Accounts	233,192	134,129
Deposits, Savings Deposits	152,585	154,532
Now Money Market Accounts	572,860	690,193
Certificates of Deposit, at Carrying Value	222,897	232,859
Short-term Debt	18,048	12,921
Accrued Interest Payable	46	89
Equity Funds [Member]
Financial assets
Securities, carrying amount	$ 512	$ 509
Impaired Loans [Member] \| Maximum [Member] \| Sales Comparison Valuation Technique [Member] \| One to Four Family Residential Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Discount Rate		4.80%
Impaired Loans [Member] \| Maximum [Member] \| Sales Comparison Valuation Technique [Member] \| Multi Family Mortgage Loans [Member]
Financial liabilities
Fair Value Inputs, Comparability Adjustments	10.00%	43.70%
Impaired Loans [Member] \| Maximum [Member] \| Sales Comparison Valuation Technique [Member] \| Commercial Real Estate [Member]
Financial liabilities
Fair Value Inputs, Comparability Adjustments		33.90%
Impaired Loans [Member] \| Maximum [Member] \| Income Approach Valuation Technique [Member] \| Multi Family Mortgage Loans [Member]
Financial liabilities
Fair Value Inputs, Cap Rate	10.00%	13.80%
Impaired Loans [Member] \| Maximum [Member] \| Income Approach Valuation Technique [Member] \| Commercial Real Estate [Member]
Financial liabilities
Fair Value Inputs, Cap Rate		11.00%
Impaired Loans [Member] \| Minimum [Member] \| Sales Comparison Valuation Technique [Member] \| One to Four Family Residential Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Discount Rate		4.80%
Impaired Loans [Member] \| Minimum [Member] \| Sales Comparison Valuation Technique [Member] \| Multi Family Mortgage Loans [Member]
Financial liabilities
Fair Value Inputs, Comparability Adjustments	10.00%	(2.10%)
Impaired Loans [Member] \| Minimum [Member] \| Sales Comparison Valuation Technique [Member] \| Commercial Real Estate [Member]
Financial liabilities
Fair Value Inputs, Comparability Adjustments		(2.10%)
Impaired Loans [Member] \| Minimum [Member] \| Income Approach Valuation Technique [Member] \| Multi Family Mortgage Loans [Member]
Financial liabilities
Fair Value Inputs, Cap Rate	10.00%	9.60%
Impaired Loans [Member] \| Minimum [Member] \| Income Approach Valuation Technique [Member] \| Commercial Real Estate [Member]
Financial liabilities
Fair Value Inputs, Cap Rate		10.00%
Impaired Loans [Member] \| Weighted Average [Member] \| Sales Comparison Valuation Technique [Member] \| One to Four Family Residential Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Discount Rate		4.80%
Impaired Loans [Member] \| Weighted Average [Member] \| Sales Comparison Valuation Technique [Member] \| Multi Family Mortgage Loans [Member]
Financial liabilities
Fair Value Inputs, Comparability Adjustments	10.00%	41.00%
Impaired Loans [Member] \| Weighted Average [Member] \| Sales Comparison Valuation Technique [Member] \| Commercial Real Estate [Member]
Financial liabilities
Fair Value Inputs, Comparability Adjustments		24.00%
Impaired Loans [Member] \| Weighted Average [Member] \| Income Approach Valuation Technique [Member] \| Multi Family Mortgage Loans [Member]
Financial liabilities
Fair Value Inputs, Cap Rate	10.00%	10.00%
Impaired Loans [Member] \| Weighted Average [Member] \| Income Approach Valuation Technique [Member] \| Commercial Real Estate [Member]
Financial liabilities
Fair Value Inputs, Cap Rate		10.00%
Other Real Estate Owned [Member] \| Maximum [Member] \| Sales Comparison Valuation Technique [Member] \| One to Four Family Residential Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Discount Rate	2.80%	7.70%
Other Real Estate Owned [Member] \| Maximum [Member] \| Sales Comparison Valuation Technique [Member] \| Multi Family Mortgage Loans [Member]
Financial liabilities
Fair Value Inputs, Comparability Adjustments	17.24%	13.50%
Other Real Estate Owned [Member] \| Maximum [Member] \| Sales Comparison Valuation Technique [Member] \| Commercial Real Estate [Member]
Financial liabilities
Fair Value Inputs, Comparability Adjustments		4.20%
Other Real Estate Owned [Member] \| Minimum [Member] \| Sales Comparison Valuation Technique [Member] \| One to Four Family Residential Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Discount Rate	(0.35%)	6.30%
Other Real Estate Owned [Member] \| Minimum [Member] \| Sales Comparison Valuation Technique [Member] \| Multi Family Mortgage Loans [Member]
Financial liabilities
Fair Value Inputs, Comparability Adjustments	(7.70%)	(6.60%)
Other Real Estate Owned [Member] \| Minimum [Member] \| Sales Comparison Valuation Technique [Member] \| Commercial Real Estate [Member]
Financial liabilities
Fair Value Inputs, Comparability Adjustments		(21.90%)
Other Real Estate Owned [Member] \| Weighted Average [Member] \| Sales Comparison Valuation Technique [Member] \| One to Four Family Residential Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Discount Rate	0.03%	7.00%
Other Real Estate Owned [Member] \| Weighted Average [Member] \| Sales Comparison Valuation Technique [Member] \| Multi Family Mortgage Loans [Member]
Financial liabilities
Fair Value Inputs, Comparability Adjustments	6.00%	0.40%
Other Real Estate Owned [Member] \| Weighted Average [Member] \| Sales Comparison Valuation Technique [Member] \| Commercial Real Estate [Member]
Financial liabilities
Fair Value Inputs, Comparability Adjustments		(10.00%)