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Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Contract	Mar. 31, 2013 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	151	148
Pre-Modification Outstanding Recorded Investment	$ 2,471	$ 3,031
Post-Modification Outstanding Recorded Investment	2,436	2,992
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	5
Pre-Modification Outstanding Recorded Investment	188	1,029
Post-Modification Outstanding Recorded Investment	188	905
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1
Pre-Modification Outstanding Recorded Investment	52
Post-Modification Outstanding Recorded Investment	50
Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	5
Pre-Modification Outstanding Recorded Investment	240	1,029
Post-Modification Outstanding Recorded Investment	238	905
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	126	110
Pre-Modification Outstanding Recorded Investment	1,678	1,176
Post-Modification Outstanding Recorded Investment	1,647	1,150
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	9	14
Pre-Modification Outstanding Recorded Investment	281	597
Post-Modification Outstanding Recorded Investment	280	709
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	7	10
Pre-Modification Outstanding Recorded Investment	17	56
Post-Modification Outstanding Recorded Investment	16	56
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	7	9
Pre-Modification Outstanding Recorded Investment	255	173
Post-Modification Outstanding Recorded Investment	$ 255	$ 172

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- Definition

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=28368275&loc=SL6953676-111524

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- Definition

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=28368275&loc=SL6953676-111524

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- Definition

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=28368275&loc=SL6953676-111524

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