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, 2017	Mar. 31, 2016
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance total	$ 1,379	$ 5,773
Total ending loans balance	1,379	5,788
Allowance For Loan Loss Allocated		900
Average Balance in Impaired Loans total	2,002	6,266
Cash/Accrual Interest Income Recognized, Total		1
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	1,379	3,016
Recorded Investment With no recorded allowance	1,379	3,021
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	2,002	3,499
Cash/Accrual Interest Income Recognized, With no recorded allowance		1
Unpaid Principal Balance With an allowance recorded		2,757
Recorded Investment With an allowance recorded		2,767
Allowance For Loan Loss Allocated		900
Average Balance in Impaired Loans With an allowance recorded		2,767
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	759	1,089
Recorded Investment With no recorded allowance	759	1,089
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	1,021	1,106
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	387	1,851
Recorded Investment With no recorded allowance	387	1,856
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	393	2,063
Cash/Accrual Interest Income Recognized, With no recorded allowance		1
Unpaid Principal Balance With an allowance recorded		2,757
Recorded Investment With an allowance recorded		2,767
Allowance For Loan Loss Allocated		900
Average Balance in Impaired Loans With an allowance recorded		2,767
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]
Unpaid Principal Balance With no recorded allowance	112
Recorded Investment With no recorded allowance	112
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	238
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	121	76
Recorded Investment With no recorded allowance	121	76
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	350	330
Cash/Accrual Interest Income Recognized, With an allowance recorded	$ 0	$ 0

Impaired financing receivable interest income accrual method and cash basis method.

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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=66008989&loc=d3e5212-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 310
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-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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