Loans and Leases - Tables for Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 44,846	$ 48,789	$ 55,761
Interest Income Recognized	1,433	1,565	1,863
Additional Interest Income That Would Have Been Recognized Under Original Terms	909	1,298	1,164
Loans Held For Sale [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	1,832	0
Interest Income Recognized	0	0	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	0	110	0
Commercial, Financial and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	13,126	15,383	15,334
Interest Income Recognized	258	423	540
Additional Interest Income That Would Have Been Recognized Under Original Terms	381	481	258
Real Estate-Commercial [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	26,698	23,692	26,662
Interest Income Recognized	1,106	996	1,143
Additional Interest Income That Would Have Been Recognized Under Original Terms	272	330	323
Real Estate-Construction [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	3,164	10,412
Interest Income Recognized	0	0	103
Additional Interest Income That Would Have Been Recognized Under Original Terms	0	162	463
Real Estate-Residential Secured for Business Purpose [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	4,084	3,805	2,524
Interest Income Recognized	67	144	77
Additional Interest Income That Would Have Been Recognized Under Original Terms	207	161	61
Real Estate-Residential Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	498	729	719
Interest Income Recognized	2	2	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	24	43	49
Real Estate-Home Equity Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	440	184	106
Interest Income Recognized	0	0	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	$ 25	$ 11	$ 10

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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=66008989&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=66008989&loc=d3e5258-111524

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