Loans and Leases - Average Recorded Investment in Impaired Loans and Leases and Analysis of Interest on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 40,472	$ 56,408	$ 49,120	$ 55,305
Interest Income Recognized	287	470	1,239	1,372
Additional Interest Income That Would Have Been Recognized Under Original Terms	409	293	998	891
Interest income, cash basis for nonaccrual loans	15	0	37	23
Interest income, accrual method	272	470	1,200	1,300
Loans Held For Sale [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	4,000	0	1,233	0
Interest Income Recognized	0	0	0	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	56	0	57	0
Commercial, Financial and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	15,099	16,577	15,691	14,806
Interest Income Recognized	88	150	346	401
Additional Interest Income That Would Have Been Recognized Under Original Terms	185	72	371	188
Real Estate-Commercial [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	15,430	26,531	23,577	25,734
Interest Income Recognized	152	281	778	816
Additional Interest Income That Would Have Been Recognized Under Original Terms	92	82	257	248
Real Estate-Construction [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	607	9,982	4,041	11,499
Interest Income Recognized	0	20	0	103
Additional Interest Income That Would Have Been Recognized Under Original Terms	6	116	159	363
Real Estate-Residential Secured for Business Purpose [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	4,394	2,643	3,698	2,400
Interest Income Recognized	47	19	115	52
Additional Interest Income That Would Have Been Recognized Under Original Terms	58	13	112	48
Real Estate-Residential Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	782	590	706	779
Interest Income Recognized	0	0	0	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	10	9	34	41
Real Estate-Home Equity Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	160	84	174	82
Interest Income Recognized	0	0	0	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	2	1	8	3
Loans to Individuals [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	1	0	5
Interest Income Recognized	0	0	0	0
Additional Interest Income That Would Have Been Recognized Under Original Terms	$ 0	$ 0	$ 0	$ 0