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Loans Modified as Troubled Debt Restructurings by Type of Concession Made and Loan Class (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Contract	Dec. 31, 2014 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Total Contracts | Contract	5	13
Pre-Modification Recorded Investment	$ 342	$ 3,608
Post-Modification Recorded Investment	$ 342	$ 3,608
Below Market Interest Rate
Financing Receivable, Modifications [Line Items]
Total Contracts | Contract		5
Pre-Modification Recorded Investment		$ 2,095
Post-Modification Recorded Investment		$ 2,095
Below Market Interest Rate | Single Family Owner Occupied
Financing Receivable, Modifications [Line Items]
Total Contracts | Contract		4
Pre-Modification Recorded Investment		$ 1,850
Post-Modification Recorded Investment		$ 1,850
Below Market Interest Rate | Owner Occupied Construction
Financing Receivable, Modifications [Line Items]
Total Contracts | Contract		1
Pre-Modification Recorded Investment		$ 245
Post-Modification Recorded Investment		$ 245
Extended Payment Term
Financing Receivable, Modifications [Line Items]
Total Contracts | Contract		2
Pre-Modification Recorded Investment		$ 771
Post-Modification Recorded Investment		$ 771
Extended Payment Term | Single-family Non-owner Occupied
Financing Receivable, Modifications [Line Items]
Total Contracts | Contract		1
Pre-Modification Recorded Investment		$ 468
Post-Modification Recorded Investment		$ 468
Extended Payment Term | Non-farm, Non-residential
Financing Receivable, Modifications [Line Items]
Total Contracts | Contract		1
Pre-Modification Recorded Investment		$ 303
Post-Modification Recorded Investment		$ 303
Below Market Interest Rate And Extended Payment Term
Financing Receivable, Modifications [Line Items]
Total Contracts | Contract	5	6
Pre-Modification Recorded Investment	$ 342	$ 742
Post-Modification Recorded Investment	$ 342	$ 742
Below Market Interest Rate And Extended Payment Term | Single Family Owner Occupied
Financing Receivable, Modifications [Line Items]
Total Contracts | Contract	5	5
Pre-Modification Recorded Investment	$ 342	$ 487
Post-Modification Recorded Investment	$ 342	$ 487
Below Market Interest Rate And Extended Payment Term | Single-family Non-owner Occupied
Financing Receivable, Modifications [Line Items]
Total Contracts | Contract		1
Pre-Modification Recorded Investment		$ 255
Post-Modification Recorded Investment		$ 255

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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=49124121&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=49124121&loc=SL6953676-111524

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Pre-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=49124121&loc=SL6953676-111524

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