Non-performing Loans and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loan (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance total	$ 3,639	$ 4,330	$ 3,639	$ 4,330
Total ending loans balance	3,640	4,344	3,640	4,344
Allowance For Loan Loss Allocated		500		500
Average Balance in Impaired Loans total	3,262	4,729	2,518	5,492
Cash/Accrual Interest Income Recognized, Total	40	1	40	2
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	3,639	1,601	3,639	1,601
Recorded Investment With no recorded allowance	3,640	1,605	3,640	1,605
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	3,262	1,982	2,518	2,735
Cash/Accrual Interest Income Recognized, With no recorded allowance	40	1	40	2
Unpaid Principal Balance With an allowance recorded		2,729		2,729
Recorded Investment With an allowance recorded		2,739		2,739
Allowance For Loan Loss Allocated		500		500
Average Balance in Impaired Loans With an allowance recorded		2,747		2,757
Cash/Accrual Interest Income Recognized, With an allowance recorded	0	0	0	0
Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	1,591	1,054	1,591	1,054
Recorded Investment With no recorded allowance	1,592	1,054	1,592	1,054
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	1,538	1,062	1,233	1,079
Cash/Accrual Interest Income Recognized, With no recorded allowance	22		22
Cash/Accrual Interest Income Recognized, With an allowance recorded	0	0	0	0
Commercial [Member] \| Non Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	467	476	467	476
Recorded Investment With no recorded allowance	467	480	467	480
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	471	600	432	1,331
Cash/Accrual Interest Income Recognized, With no recorded allowance	2	1	2	2
Unpaid Principal Balance With an allowance recorded		2,729		2,729
Recorded Investment With an allowance recorded		2,739		2,739
Allowance For Loan Loss Allocated		500		500
Average Balance in Impaired Loans With an allowance recorded		2,747		2,757
Cash/Accrual Interest Income Recognized, With an allowance recorded	0	0	0	0
Commercial [Member] \| Residential Development [Member]
Financing Receivable, Impaired [Line Items]
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Cash/Accrual Interest Income Recognized, With an allowance recorded	0	0	0	0
Commercial [Member] \| Development & Spec Land Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	107		107
Recorded Investment With no recorded allowance	107		107
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	230		234
Cash/Accrual Interest Income Recognized, With an allowance recorded	0	0	0	0
Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	1,474	71	1,474	71
Recorded Investment With no recorded allowance	1,474	71	1,474	71
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	1,023	320	619	325
Cash/Accrual Interest Income Recognized, With no recorded allowance	16		16
Cash/Accrual Interest Income Recognized, With an allowance recorded	$ 0	$ 0	$ 0	$ 0

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Impaired Financing Receivable With No Related Allowance

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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