Loans and Leases - Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 52,042	$ 52,598
Impaired loans with an allowance recorded, Recorded Investment	4,149	5,735
Impaired loans with no related allowance, Unpaid Principal Balance	54,109	62,486
Impaired loans with an allowance recorded, Unpaid Principal Balance	4,151	5,798
Total impaired loans, Recorded Investment	56,191	58,333
Total impaired loans, Unpaid Principal Balance	58,260	68,284
Total impaired loans, Related Allowance	998	2,963
Commercial, Financial and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	12,628	10,890
Impaired loans with an allowance recorded, Recorded Investment	3,933	3,215
Impaired loans with no related allowance, Unpaid Principal Balance	13,050	11,749
Impaired loans with an allowance recorded, Unpaid Principal Balance	3,935	3,272
Total impaired loans, Recorded Investment	16,561	14,105
Total impaired loans, Unpaid Principal Balance	16,985	15,021
Total impaired loans, Related Allowance	920	2,398
Real Estate-Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	29,779	28,883
Impaired loans with an allowance recorded, Recorded Investment	216	0
Impaired loans with no related allowance, Unpaid Principal Balance	30,810	35,700
Impaired loans with an allowance recorded, Unpaid Principal Balance	216	0
Total impaired loans, Recorded Investment	29,995	28,883
Total impaired loans, Unpaid Principal Balance	31,026	35,700
Total impaired loans, Related Allowance	78	0
Real Estate-Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	5,931	12,357
Impaired loans with no related allowance, Unpaid Principal Balance	6,474	14,540
Total impaired loans, Recorded Investment	5,931	12,357
Total impaired loans, Unpaid Principal Balance	6,474	14,540
Total impaired loans, Related Allowance	0	0
Real Estate-Residential Secured for Business Purpose [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	3,008	224
Impaired loans with an allowance recorded, Recorded Investment	0	1,550
Impaired loans with no related allowance, Unpaid Principal Balance	3,044	235
Impaired loans with an allowance recorded, Unpaid Principal Balance	0	1,550
Total impaired loans, Recorded Investment	3,008	1,774
Total impaired loans, Unpaid Principal Balance	3,044	1,785
Total impaired loans, Related Allowance	0	501
Real Estate-Residential Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	512	131
Impaired loans with an allowance recorded, Recorded Investment	0	970
Impaired loans with no related allowance, Unpaid Principal Balance	547	131
Impaired loans with an allowance recorded, Unpaid Principal Balance	0	976
Total impaired loans, Recorded Investment	512	1,101
Total impaired loans, Unpaid Principal Balance	547	1,107
Total impaired loans, Related Allowance	0	64
Real Estate-Home Equity Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	184	77
Impaired loans with no related allowance, Unpaid Principal Balance	184	77
Total impaired loans, Recorded Investment	184	77
Total impaired loans, Unpaid Principal Balance	184	77
Total impaired loans, Related Allowance	0	0
Loans to Individuals [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	0	36
Impaired loans with no related allowance, Unpaid Principal Balance	0	54
Total impaired loans, Recorded Investment	0	36
Total impaired loans, Unpaid Principal Balance	0	54
Total impaired loans, Related Allowance	$ 0	$ 0

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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 14A

-Subparagraph (b)

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-Publisher FASB

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-Publisher FASB

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