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Loan Receivable and Allowance for Loan and Lease Losses Loans receivable, net of allowance for loan losses (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount |  | $ 560,152 |  | $ 481,463 |  |  |
Percentage of Loan Type |  | 100.00% |  | 100.00% |  |  |
Premium on loans |  | $ 3,102 |  | $ 2,233 |  |  |
Deferred fees and loan discounts, net |  | (483) |  | (503) |  |  |
Allowance for loan losses |  | (4,572) | $ (4,107) | (4,477) | $ (6,597) | $ (7,066) | $ (7,233)
Total loans receivable, net |  | 558,199 |  | 478,716 |  |  |
Loans held-for-sale (HFS) |  | 2,586 |  | 2,576 |  |  |
One- to four family loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount |  | $ 127,572 |  | $ 125,020 |  |  |
Percentage of Loan Type |  | 23.00% |  | 26.00% |  |  |
Multifamily Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount |  | $ 108,340 |  | $ 93,780 |  |  |
Percentage of Loan Type |  | 19.00% |  | 19.00% |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount |  | $ 242,156 |  | $ 186,443 |  |  |
Percentage of Loan Type |  | 43.00% |  | 39.00% |  |  |
Construction Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount |  | $ 5,099 |  | $ 5,107 |  |  |
Percentage of Loan Type |  | 1.00% |  | 1.00% |  |  |
Business [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | [1] | $ 76,896 |  | $ 70,679 |  |  |
Percentage of Loan Type | [1] | 14.00% |  | 15.00% |  |  |
Consumer Loan [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | [2] | $ 89 |  | $ 434 |  |  |
Percentage of Loan Type | [2] | 0.00% |  | 0.00% |  |  |
[1] | (1) Includes business overdrafts
[2] | 2) Includes personal loans and consumer overdrafts

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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