Loans and Leases - Reserve for Loan and Lease Losses Roll Forward (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 21,555	$ 17,499	$ 17,628
Charge-offs	(15,651)	(7,137)	(6,988)
Recoveries	3,150	1,301	2,038
Provision (recovery of provision)	20,299	9,892	4,646
Provision (recovery of provision) for acquired credit impaired loans	11	0	175
Ending balance	29,364	21,555	17,499
Commercial, Financial and Agricultural [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,742	7,037	6,418
Charge-offs	(14,655)	(1,030)	(4,827)
Recoveries	2,140	801	1,454
Provision (recovery of provision)	13,756	(66)	3,992
Provision (recovery of provision) for acquired credit impaired loans	0	0	0
Ending balance	7,983	6,742	7,037
Real Estate-Commercial and Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,839	7,505	6,572
Charge-offs	(40)	(232)	(307)
Recoveries	333	5	101
Provision (recovery of provision)	3,771	2,561	961
Provision (recovery of provision) for acquired credit impaired loans	0	0	178
Ending balance	13,903	9,839	7,505
Real Estate-Residential Secured for Business Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,661	774	763
Charge-offs	(31)	(1,370)	(522)
Recoveries	280	54	71
Provision (recovery of provision)	318	2,204	462
Provision (recovery of provision) for acquired credit impaired loans	8	(1)	0
Ending balance	2,236	1,661	774
Real Estate-Residential and Home Equity Secured for Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,754	993	1,575
Charge-offs	0	(196)	(178)
Recoveries	78	99	88
Provision (recovery of provision)	1,364	857	(489)
Provision (recovery of provision) for acquired credit impaired loans	3	1	(3)
Ending balance	3,199	1,754	993
Loans to Individuals [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	373	364	346
Charge-offs	(353)	(317)	(395)
Recoveries	88	136	133
Provision (recovery of provision)	376	190	280
Provision (recovery of provision) for acquired credit impaired loans	0	0	0
Ending balance	484	373	364
Lease Financings [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,132	788	1,042
Charge-offs	(572)	(3,992)	(759)
Recoveries	231	206	191
Provision (recovery of provision)	497	4,130	314
Provision (recovery of provision) for acquired credit impaired loans	0	0	0
Ending balance	1,288	1,132	788
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	54	38	912
Provision (recovery of provision)	217	16	(874)
Provision (recovery of provision) for acquired credit impaired loans	0	0	0
Ending balance	$ 271	$ 54	$ 38

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Amount of expense related to estimated loss from loan and lease transactions on acquired loans.

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Amount of expense related to estimated loss from loan and lease transactions on originated loans.

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