Loans and Leases - Reserve for Loan and Lease Losses Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 29,364	$ 21,555
Charge-offs	(709)	(869)
Recoveries	262	671
Provision (recovery of provision)	2,684	2,052
Provision for acquired credit impaired loans	1	1
Ending balance	31,602	23,410
Commercial, Financial and Agricultural [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,983	6,742
Charge-offs	(468)	(601)
Recoveries	82	226
Provision (recovery of provision)	1,353	575
Provision for acquired credit impaired loans	0	0
Ending balance	8,950	6,942
Real Estate-Commercial and Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	13,903	9,839
Charge-offs	(41)	(40)
Recoveries	91	73
Provision (recovery of provision)	1,028	1,306
Provision for acquired credit impaired loans	0	0
Ending balance	14,981	11,178
Real Estate-Residential Secured for Business Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,236	1,661
Charge-offs	0	0
Recoveries	4	251
Provision (recovery of provision)	62	(41)
Provision for acquired credit impaired loans	0	0
Ending balance	2,302	1,871
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
Charge-offs	(11)	0
Recoveries	5	57
Provision (recovery of provision)	185	96
Provision for acquired credit impaired loans	1	1
Ending balance	3,379	1,908
Loans to Individuals [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	484	373
Charge-offs	(85)	(92)
Recoveries	22	30
Provision (recovery of provision)	48	61
Provision for acquired credit impaired loans	0	0
Ending balance	469	372
Lease Financings [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,288	1,132
Charge-offs	(104)	(136)
Recoveries	58	34
Provision (recovery of provision)	33	49
Provision for acquired credit impaired loans	0	0
Ending balance	1,275	1,079
Unallocated Financing Receivables [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	271	54
Provision (recovery of provision)	(25)	6
Provision for acquired credit impaired loans	0	0
Ending balance	$ 246	$ 60

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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