Loans and Leases - Troubled Debt Restructured Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014 Loans	Dec. 31, 2013 Loans
Accrual Troubled Debt Restructuring Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	7	6
Pre- Restructuring Outstanding Recorded Investment	$ 2,824	$ 3,053
Post- Restructuring Outstanding Recorded Investment	2,824	3,053
Related Allowance	507	0
Accrual Troubled Debt Restructuring Loans [Member] \| Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	6	2
Pre- Restructuring Outstanding Recorded Investment	1,824	1,025
Post- Restructuring Outstanding Recorded Investment	1,824	1,025
Related Allowance	507	0
Accrual Troubled Debt Restructuring Loans [Member] \| Real Estate-Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	3
Pre- Restructuring Outstanding Recorded Investment	1,000	1,569
Post- Restructuring Outstanding Recorded Investment	1,000	1,569
Related Allowance	0	0
Accrual Troubled Debt Restructuring Loans [Member] \| Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1
Pre- Restructuring Outstanding Recorded Investment	0	459
Post- Restructuring Outstanding Recorded Investment	0	459
Related Allowance	0	0
Nonaccrual Troubled Debt Restructured Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	3	0
Pre- Restructuring Outstanding Recorded Investment	738	0
Post- Restructuring Outstanding Recorded Investment	738	0
Related Allowance	0	0
Nonaccrual Troubled Debt Restructured Loans [Member] \| Real Estate-Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	0
Pre- Restructuring Outstanding Recorded Investment	50	0
Post- Restructuring Outstanding Recorded Investment	50	0
Related Allowance	0	0
Nonaccrual Troubled Debt Restructured Loans [Member] \| Real Estate-Residential Secured for Business Purpose [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	0
Pre- Restructuring Outstanding Recorded Investment	688	0
Post- Restructuring Outstanding Recorded Investment	688	0
Related Allowance	$ 0	$ 0

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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=35738203&loc=SL6953676-111524

+ Details

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

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- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

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- Definition

Reflects the amount of the allowance related to a troubled debt restructuring.

+ References

No definition available.

+ Details

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