Non-performing Loans and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loan (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance total	$ 5,773	$ 8,541
Total ending loans balance	5,788	8,547
Allowance For Loan Loss Allocated	900	1,029
Average Balance in Impaired Loans total	6,266	9,470
Cash/Accrual Interest Income Recognized, Total	1	8
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	3,016	5,592
Recorded Investment With no recorded allowance	3,021	5,598
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	3,499	6,512
Cash/Accrual Interest Income Recognized, With no recorded allowance	1	8
Unpaid Principal Balance With an allowance recorded	2,757	2,949
Recorded Investment With an allowance recorded	2,767	2,949
Allowance For Loan Loss Allocated	900	1,029
Average Balance in Impaired Loans With an allowance recorded	2,767	2,958
Cash/Accrual Interest Income Recognized, With an allowance recorded	0	0
Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	1,089	1,076
Recorded Investment With no recorded allowance	1,089	1,077
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	1,106	1,329
Cash/Accrual Interest Income Recognized, With no recorded allowance		2
Unpaid Principal Balance With an allowance recorded		417
Recorded Investment With an allowance recorded		417
Allowance For Loan Loss Allocated		165
Average Balance in Impaired Loans With an allowance recorded		419
Cash/Accrual Interest Income Recognized, With an allowance recorded	0	0
Commercial [Member] \| Non Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	1,851	3,907
Recorded Investment With no recorded allowance	1,856	3,912
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	2,063	4,534
Cash/Accrual Interest Income Recognized, With no recorded allowance	1	6
Unpaid Principal Balance With an allowance recorded	2,757	1,590
Recorded Investment With an allowance recorded	2,767	1,590
Allowance For Loan Loss Allocated	900	184
Average Balance in Impaired Loans With an allowance recorded	2,767	1,590
Cash/Accrual Interest Income Recognized, With an allowance recorded	0	0
Commercial [Member] \| Residential Development [Member]
Financing Receivable, Impaired [Line Items]
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Cash/Accrual Interest Income Recognized, With an allowance recorded	0	0
Commercial [Member] \| Development & Spec Land Loans [Member]
Financing Receivable, Impaired [Line Items]
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Cash/Accrual Interest Income Recognized, With an allowance recorded	0	0
Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	76	609
Recorded Investment With no recorded allowance	76	609
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	330	649
Unpaid Principal Balance With an allowance recorded		942
Recorded Investment With an allowance recorded		942
Allowance For Loan Loss Allocated		680
Average Balance in Impaired Loans With an allowance recorded		949
Cash/Accrual Interest Income Recognized, With an allowance recorded	$ 0	$ 0

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Impaired Financing Receivable With No Related Allowance

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- Definition

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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 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524

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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 14A
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-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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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 17
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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