Credit Quality of Loans and the Allowance for Loan Losses (Schedule of Activity in Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Activity in the allowance for loan losses by portfolio segment
Beginning balance	$ 3,157	$ 2,776	$ 3,040	$ 2,837
Provision (Credit) charged to expense	99	208	209	152
Losses charged off	(7)	(78)	(30)	(84)
Recoveries	1	1	31	2
Ending balance	3,250	2,907	3,250	2,907
One-to-four family residential [Member]
Activity in the allowance for loan losses by portfolio segment
Beginning balance	1,362	1,582	1,479	1,346
Provision (Credit) charged to expense	(111)	(105)	(234)	130
Losses charged off	(7)		(30)
Recoveries	1		30	1
Ending balance	1,245	1,477	1,245	1,477
All other mortgage loans [Member]
Activity in the allowance for loan losses by portfolio segment
Beginning balance	1,095	957	1,108	1,210
Provision (Credit) charged to expense	203	238	190	(10)
Losses charged off		(78)		(83)
Recoveries
Ending balance	1,298	1,117	1,298	1,117
Commercial business loans [Member]
Activity in the allowance for loan losses by portfolio segment
Beginning balance	695	234	447	279
Provision (Credit) charged to expense		75	247	30
Losses charged off
Recoveries		1	1	1
Ending balance	695	310	695	310
Consumer loans [Member]
Activity in the allowance for loan losses by portfolio segment
Beginning balance	5	3	6	2
Provision (Credit) charged to expense	7		6	2
Losses charged off				(1)
Recoveries
Ending balance	$ 12	$ 3	$ 12	$ 3

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

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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=84173941&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=84173941&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 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707

Reference 5: 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=82894903&loc=d3e15032-111544

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

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No definition available.

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