Loans and Leases - Reserve for Loan and Lease Losses Roll Forward (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($) loan borrowers	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 16,452,000	$ 20,934,000	$ 17,628,000	$ 20,662,000
Charge-offs	(830,000)	(2,770,000)	(2,902,000)	(3,863,000)
Recoveries	701,000	297,000	1,271,000	588,000
Provision (recovery of provision)	653,000	1,141,000	980,000	2,215,000
Provision for acquired credit impaired loans	177,000		176,000
Ending balance	17,153,000	19,602,000	17,153,000	19,602,000
Commercial, Financial and Agricultural [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,630,000	6,712,000	6,418,000	6,920,000
Charge-offs	(346,000)	(1,038,000)	(1,827,000)	(1,338,000)
Recoveries	515,000	115,000	965,000	225,000
Provision (recovery of provision)	(11,000)	1,058,000	232,000	1,040,000
Provision for acquired credit impaired loans	0		0
Ending balance	5,788,000	6,847,000	5,788,000	6,847,000
Real Estate-Commercial and Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Amount of Loans Charged Off Prior to Being Transferred to Loans Held For Sale		$ 1.3		1,300,000
Number of Loans Charged Off Prior to Being Transferred to Loans Held for Sale | loan		2
Number of Borrowers, Loans Charged Off Prior to Being Transferred to Loans Held for Sale | borrowers		1
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,471,000	$ 9,648,000	6,572,000	8,943,000
Charge-offs	(179,000)	(1,348,000)	(205,000)	(1,696,000)
Recoveries	9,000	91,000	16,000	156,000
Provision (recovery of provision)	1,070,000	(590,000)	988,000	398,000
Provision for acquired credit impaired loans	178,000		178,000
Ending balance	7,549,000	7,801,000	7,549,000	7,801,000
Real Estate-Residential Secured for Business Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	747,000	668,000	763,000	763,000
Charge-offs	(27,000)	(24,000)	(265,000)	(24,000)
Recoveries	34,000	7,000	53,000	13,000
Provision (recovery of provision)	(698,000)	(35,000)	(495,000)	(136,000)
Provision for acquired credit impaired loans	0		0
Ending balance	56,000	616,000	56,000	616,000
Real Estate-Residential and Home Equity Secured for Personal Purpose [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,312,000	1,128,000	1,575,000	1,124,000
Charge-offs	(10,000)	(107,000)	(56,000)	(138,000)
Recoveries	34,000	0	51,000	1,000
Provision (recovery of provision)	(34,000)	167,000	(267,000)	201,000
Provision for acquired credit impaired loans	(1,000)		(2,000)
Ending balance	1,301,000	1,188,000	1,301,000	1,188,000
Loans to Individuals [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	356,000	365,000	346,000	360,000
Charge-offs	(108,000)	(64,000)	(184,000)	(248,000)
Recoveries	30,000	41,000	63,000	89,000
Provision (recovery of provision)	133,000	47,000	186,000	188,000
Provision for acquired credit impaired loans	0		0
Ending balance	411,000	389,000	411,000	389,000
Lease Financings [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	922,000	1,013,000	1,042,000	985,000
Charge-offs	(160,000)	(189,000)	(365,000)	(419,000)
Recoveries	79,000	43,000	123,000	104,000
Provision (recovery of provision)	280,000	258,000	321,000	455,000
Provision for acquired credit impaired loans	0		0
Ending balance	1,121,000	1,125,000	1,121,000	1,125,000
Unallocated Financing Receivables [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,014,000	1,400,000	912,000	1,567,000
Provision (recovery of provision)	(87,000)	236,000	15,000	69,000
Provision for acquired credit impaired loans	0		0
Ending balance	$ 927,000	$ 1,636,000	$ 927,000	$ 1,636,000