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Credit Quality and Allowance for Loan Losses - Summary of Information Pertaining to Loans Modified (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) Contract	Sep. 30, 2016 USD ($) Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	11	32
Pre-modification Outstanding Recorded Investment	$ 2,236	$ 7,162
Post-modification Outstanding Recorded Investment	$ 1,934	$ 6,420
One- to Four-Family First Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	5	7
Pre-modification Outstanding Recorded Investment	$ 268	$ 1,098
Post-modification Outstanding Recorded Investment	$ 263	$ 648
Home Equity Loans and Lines [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	2	3
Pre-modification Outstanding Recorded Investment	$ 38	$ 939
Post-modification Outstanding Recorded Investment	$ 37	$ 930
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	1	4
Pre-modification Outstanding Recorded Investment	$ 431	$ 1,006
Post-modification Outstanding Recorded Investment	$ 431	$ 893
Construction and Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract		1
Pre-modification Outstanding Recorded Investment		$ 351
Post-modification Outstanding Recorded Investment		$ 211
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	1	16
Pre-modification Outstanding Recorded Investment	$ 1,439	$ 3,717
Post-modification Outstanding Recorded Investment	$ 1,146	$ 3,698
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	2	1
Pre-modification Outstanding Recorded Investment	$ 60	$ 51
Post-modification Outstanding Recorded Investment	$ 57	$ 40

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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