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Credit Quality and Allowance for Loan Losses - Information about Company's TDRs (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 3,713	$ 3,704
Past Due Greater Than 30 Days and Accruing	214	946
Nonaccrual TDRs	9,394	10,410
Total TDRs	13,321	15,060
Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,146	1,851
Past Due Greater Than 30 Days and Accruing	214	946
Nonaccrual TDRs	3,042	3,154
Total TDRs	5,402	5,951
Real Estate Loans [Member] | One- to Four-Family First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	518	568
Past Due Greater Than 30 Days and Accruing	71	86
Nonaccrual TDRs	607	387
Total TDRs	1,196	1,041
Real Estate Loans [Member] | Home Equity Loans and Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	312	331
Past Due Greater Than 30 Days and Accruing	44
Nonaccrual TDRs	930	1,050
Total TDRs	1,286	1,381
Real Estate Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,139	390
Past Due Greater Than 30 Days and Accruing	99	860
Nonaccrual TDRs	1,505	1,717
Total TDRs	2,743	2,967
Real Estate Loans [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	177	562
Total TDRs	177	562
Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,567	1,853
Nonaccrual TDRs	6,352	7,256
Total TDRs	7,919	9,109
Other Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,567	1,853
Nonaccrual TDRs	6,160	7,088
Total TDRs	7,727	8,941
Other Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual TDRs	192	168
Total TDRs	192	168
Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	789	1,271
Past Due Greater Than 30 Days and Accruing	210
Nonaccrual TDRs	8,937	9,975
Total TDRs	9,936	11,246
Originated Loans [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	789	1,271
Past Due Greater Than 30 Days and Accruing	210
Nonaccrual TDRs	2,828	3,032
Total TDRs	3,827	4,303
Originated Loans [Member] | Real Estate Loans [Member] | One- to Four-Family First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	300	276
Past Due Greater Than 30 Days and Accruing	67
Nonaccrual TDRs	487	327
Total TDRs	854	603
Originated Loans [Member] | Real Estate Loans [Member] | Home Equity Loans and Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	312	331
Past Due Greater Than 30 Days and Accruing	44
Nonaccrual TDRs	836	988
Total TDRs	1,192	1,319
Originated Loans [Member] | Real Estate Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		102
Past Due Greater Than 30 Days and Accruing	99
Nonaccrual TDRs	1,505	1,717
Total TDRs	1,604	1,819
Originated Loans [Member] | Real Estate Loans [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	177	562
Total TDRs	177	562
Originated Loans [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual TDRs	6,109	6,943
Total TDRs	6,109	6,943
Originated Loans [Member] | Other Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual TDRs	5,917	6,775
Total TDRs	5,917	6,775
Originated Loans [Member] | Other Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual TDRs	192	168
Total TDRs	192	168
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		2,433
Past Due Greater Than 30 Days and Accruing		946
Nonaccrual TDRs		435
Total TDRs		3,814
Acquired Loans [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		580
Past Due Greater Than 30 Days and Accruing		946
Nonaccrual TDRs		122
Total TDRs		1,648
Acquired Loans [Member] | Real Estate Loans [Member] | One- to Four-Family First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		292
Past Due Greater Than 30 Days and Accruing		86
Nonaccrual TDRs		60
Total TDRs		438
Acquired Loans [Member] | Real Estate Loans [Member] | Home Equity Loans and Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual TDRs		62
Total TDRs		62
Acquired Loans [Member] | Real Estate Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		288
Past Due Greater Than 30 Days and Accruing		860
Total TDRs		1,148
Acquired Loans [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		1,853
Nonaccrual TDRs		313
Total TDRs		2,166
Acquired Loans [Member] | Other Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		1,853
Nonaccrual TDRs		313
Total TDRs		$ 2,166
Non-Covered Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,924
Past Due Greater Than 30 Days and Accruing	4
Nonaccrual TDRs	457
Total TDRs	3,385
Non-Covered Acquired Loans [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,357
Past Due Greater Than 30 Days and Accruing	4
Nonaccrual TDRs	214
Total TDRs	1,575
Non-Covered Acquired Loans [Member] | Real Estate Loans [Member] | One- to Four-Family First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	218
Past Due Greater Than 30 Days and Accruing	4
Nonaccrual TDRs	120
Total TDRs	342
Non-Covered Acquired Loans [Member] | Real Estate Loans [Member] | Home Equity Loans and Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual TDRs	94
Total TDRs	94
Non-Covered Acquired Loans [Member] | Real Estate Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,139
Total TDRs	1,139
Non-Covered Acquired Loans [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,567
Nonaccrual TDRs	243
Total TDRs	1,810
Non-Covered Acquired Loans [Member] | Other Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,567
Nonaccrual TDRs	243
Total TDRs	$ 1,810

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- Definition

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+ References

No definition available.

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- Definition

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+ References

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- Definition

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+ References

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- Definition

The amount of the outstanding recorded investment related to 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 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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