Loans and Leases - Tables for Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 48,789	$ 55,761	$ 48,241
Interest Income Recognized	1,565	1,863	1,156
Additional Interest Income That Would Have Been Recognized Under Original Terms	1,298	1,164	1,652
Loans Held For Sale [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	1,832	0	0
Interest Income Recognized	0	0	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	110	0	0
Commercial, Financial and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	15,383	15,334	6,412
Interest Income Recognized	423	540	172
Additional Interest Income That Would Have Been Recognized Under Original Terms	481	258	200
Real Estate-Commercial [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	23,692	26,662	25,728
Interest Income Recognized	996	1,143	837
Additional Interest Income That Would Have Been Recognized Under Original Terms	330	323	717
Real Estate-Construction [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,164	10,412	14,621
Interest Income Recognized	0	103	124
Additional Interest Income That Would Have Been Recognized Under Original Terms	162	463	680
Real Estate-Residential Secured for Business Purpose [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,805	2,524	672
Interest Income Recognized	144	77	19
Additional Interest Income That Would Have Been Recognized Under Original Terms	161	61	10
Real Estate-Residential Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	729	719	760
Interest Income Recognized	2	0	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	43	49	45
Real Estate-Home Equity Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	184	106	8
Interest Income Recognized	0	0	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	11	10	0
Loans to Individuals [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	4	40
Interest Income Recognized	0	0	4
Additional Interest Income That Would Have Been Recognized Under Original Terms	$ 0	$ 0	$ 0

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Average 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 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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