Loans and Leases - Tables for Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 35,584	$ 44,846	$ 48,789
Interest Income Recognized	1,060	1,433	1,565
Additional Interest Income That Would Have Been Recognized Under Original Terms	889	909	1,298
Loans Held For Sale [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	0	1,832
Interest Income Recognized	0	0	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	0	0	110
Commercial, Financial and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	10,456	13,126	15,383
Interest Income Recognized	200	258	423
Additional Interest Income That Would Have Been Recognized Under Original Terms	347	381	481
Real Estate-Commercial [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	20,054	26,698	23,692
Interest Income Recognized	792	1,106	996
Additional Interest Income That Would Have Been Recognized Under Original Terms	289	272	330
Real Estate-Construction [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	253	0	3,164
Interest Income Recognized	0	0	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	19	0	162
Real Estate-Residential Secured for Business Purpose [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,801	4,084	3,805
Interest Income Recognized	65	67	144
Additional Interest Income That Would Have Been Recognized Under Original Terms	169	207	161
Real Estate-Residential Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	614	498	729
Interest Income Recognized	3	2	2
Additional Interest Income That Would Have Been Recognized Under Original Terms	39	24	43
Real Estate-Home Equity Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	406	440	184
Interest Income Recognized	0	0	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	$ 26	$ 25	$ 11

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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=84173941&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=84173941&loc=d3e5258-111524

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