Loans and Leases - Reserve for Loan and Lease Losses Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 17,499	$ 17,628
Charge-offs	(697)	(2,072)
Recoveries	281	570
Provision (recovery of provision)	2,442	327
Provision for acquired credit impaired loans	3	(1)
Ending balance	19,528	16,452
Commercial, Financial and Agricultural [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,037	6,418
Charge-offs	(178)	(1,481)
Recoveries	187	450
Provision (recovery of provision)	844	243
Provision for acquired credit impaired loans	0	0
Ending balance	7,890	5,630
Real Estate-Commercial and Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,505	6,572
Charge-offs	0	(26)
Recoveries	3	7
Provision (recovery of provision)	116	(82)
Provision for acquired credit impaired loans	0	0
Ending balance	7,624	6,471
Real Estate-Residential Secured for Business Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	774	763
Charge-offs	(42)	(238)
Recoveries	10	19
Provision (recovery of provision)	603	203
Provision for acquired credit impaired loans	0	0
Ending balance	1,345	747
Real Estate-Residential and Home Equity Secured for Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	993	1,575
Charge-offs	(94)	(46)
Recoveries	17	17
Provision (recovery of provision)	82	(233)
Provision for acquired credit impaired loans	3	(1)
Ending balance	1,001	1,312
Loans to Individuals [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	364	346
Charge-offs	(126)	(76)
Recoveries	35	33
Provision (recovery of provision)	62	53
Provision for acquired credit impaired loans	0	0
Ending balance	335	356
Lease Financings [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	788	1,042
Charge-offs	(257)	(205)
Recoveries	29	44
Provision (recovery of provision)	769	41
Provision for acquired credit impaired loans	0	0
Ending balance	1,329	922
Unallocated Financing Receivables [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	38	912
Provision (recovery of provision)	(34)	102
Provision for acquired credit impaired loans	0	0
Ending balance	$ 4	$ 1,014

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

No definition available.

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- Definition

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

+ References

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

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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Amount of expense related to estimated loass 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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