Loans and Leases - Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 33,491	$ 52,042
Impaired loans with an allowance recorded, Recorded Investment	3,277	4,149
Impaired loans with no related allowance, Unpaid Principal Balance	37,783	54,109
Impaired loans with an allowance recorded, Unpaid Principal Balance	3,349	4,151
Total impaired loans, Recorded Investment	36,768	56,191
Total impaired loans, Unpaid Principal Balance	41,132	58,260
Total impaired loans, Related Allowance	380	998
Loans Held For Sale [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	4,000	0
Impaired loans with no related allowance, Unpaid Principal Balance	5,229	0
Total impaired loans, Recorded Investment	4,000	0
Total impaired loans, Unpaid Principal Balance	5,229	0
Total impaired loans, Related Allowance	0	0
Commercial, Financial and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	10,966	12,628
Impaired loans with an allowance recorded, Recorded Investment	2,966	3,933
Impaired loans with no related allowance, Unpaid Principal Balance	12,676	13,050
Impaired loans with an allowance recorded, Unpaid Principal Balance	3,037	3,935
Total impaired loans, Recorded Investment	13,932	16,561
Total impaired loans, Unpaid Principal Balance	15,713	16,985
Total impaired loans, Related Allowance	344	920
Real Estate-Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	13,259	29,779
Impaired loans with an allowance recorded, Recorded Investment	0	216
Impaired loans with no related allowance, Unpaid Principal Balance	14,167	30,810
Impaired loans with an allowance recorded, Unpaid Principal Balance	0	216
Total impaired loans, Recorded Investment	13,259	29,995
Total impaired loans, Unpaid Principal Balance	14,167	31,026
Total impaired loans, Related Allowance	0	78
Real Estate-Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	363	5,931
Impaired loans with no related allowance, Unpaid Principal Balance	638	6,474
Total impaired loans, Recorded Investment	363	5,931
Total impaired loans, Unpaid Principal Balance	638	6,474
Total impaired loans, Related Allowance	0	0
Real Estate-Residential Secured for Business Purpose [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	4,278	3,008
Impaired loans with no related allowance, Unpaid Principal Balance	4,394	3,044
Total impaired loans, Recorded Investment	4,278	3,008
Total impaired loans, Unpaid Principal Balance	4,394	3,044
Total impaired loans, Related Allowance	0	0
Real Estate-Residential Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	524	512
Impaired loans with an allowance recorded, Recorded Investment	252	0
Impaired loans with no related allowance, Unpaid Principal Balance	578	547
Impaired loans with an allowance recorded, Unpaid Principal Balance	252	0
Total impaired loans, Recorded Investment	776	512
Total impaired loans, Unpaid Principal Balance	830	547
Total impaired loans, Related Allowance	23	0
Real Estate-Home Equity Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	101	184
Impaired loans with an allowance recorded, Recorded Investment	59	0
Impaired loans with no related allowance, Unpaid Principal Balance	101	184
Impaired loans with an allowance recorded, Unpaid Principal Balance	60	0
Total impaired loans, Recorded Investment	160	184
Total impaired loans, Unpaid Principal Balance	161	184
Total impaired loans, Related Allowance	$ 13	$ 0