Loans and Leases - Reserve for Loan and Lease Losses Roll Forward (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 29,364	$ 21,555	$ 17,499
Charge-offs	(3,463)	(15,651)	(7,137)
Recoveries	912	3,150	1,301
Provision (recovery of provision)	8,532	20,299	9,892
Provision (recovery of provision) for acquired credit impaired loans	(14)	11	0
Ending balance	35,331	29,364	21,555
Commercial, Financial and Agricultural [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,983	6,742	7,037
Charge-offs	(1,965)	(14,655)	(1,030)
Recoveries	367	2,140	801
Provision (recovery of provision)	2,374	13,756	(66)
Provision (recovery of provision) for acquired credit impaired loans	0	0	0
Ending balance	8,759	7,983	6,742
Real Estate-Commercial and Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	13,903	9,839	7,505
Charge-offs	(402)	(40)	(232)
Recoveries	93	333	5
Provision (recovery of provision)	4,602	3,771	2,561
Provision (recovery of provision) for acquired credit impaired loans	0	0	0
Ending balance	18,196	13,903	9,839
Real Estate-Residential Secured for Business Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,236	1,661	774
Charge-offs	(122)	(31)	(1,370)
Recoveries	112	280	54
Provision (recovery of provision)	411	318	2,204
Provision (recovery of provision) for acquired credit impaired loans	(15)	8	(1)
Ending balance	2,622	2,236	1,661
Real Estate-Residential and Home Equity Secured for Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,199	1,754	993
Charge-offs	(212)	0	(196)
Recoveries	21	78	99
Provision (recovery of provision)	780	1,364	857
Provision (recovery of provision) for acquired credit impaired loans	1	3	1
Ending balance	3,789	3,199	1,754
Loans to Individuals [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	484	373	364
Charge-offs	(335)	(353)	(317)
Recoveries	75	88	136
Provision (recovery of provision)	246	376	190
Provision (recovery of provision) for acquired credit impaired loans	0	0	0
Ending balance	470	484	373
Lease Financings [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,288	1,132	788
Charge-offs	(427)	(572)	(3,992)
Recoveries	244	231	206
Provision (recovery of provision)	206	497	4,130
Provision (recovery of provision) for acquired credit impaired loans	0	0	0
Ending balance	1,311	1,288	1,132
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	271	54	38
Provision (recovery of provision)	(87)	217	16
Provision (recovery of provision) for acquired credit impaired loans	0	0	0
Ending balance	$ 184	$ 271	$ 54

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.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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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.

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

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