Loans and Leases - Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 40,080	$ 52,042
Impaired loans with an allowance recorded, Recorded Investment	2,867	4,149
Impaired loans with no related allowance, Unpaid Principal Balance	43,538	54,109
Impaired loans with an allowance recorded, Unpaid Principal Balance	2,870	4,151
Total impaired loans, Recorded Investment	42,947	56,191
Total impaired loans, Unpaid Principal Balance	46,408	58,260
Total impaired loans, Related Allowance	444	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	12,542	12,628
Impaired loans with an allowance recorded, Recorded Investment	2,867	3,933
Impaired loans with no related allowance, Unpaid Principal Balance	13,518	13,050
Impaired loans with an allowance recorded, Unpaid Principal Balance	2,870	3,935
Total impaired loans, Recorded Investment	15,409	16,561
Total impaired loans, Unpaid Principal Balance	16,388	16,985
Total impaired loans, Related Allowance	444	920
Real Estate-Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	18,093	29,779
Impaired loans with an allowance recorded, Recorded Investment	0	216
Impaired loans with no related allowance, Unpaid Principal Balance	19,189	30,810
Impaired loans with an allowance recorded, Unpaid Principal Balance	0	216
Total impaired loans, Recorded Investment	18,093	29,995
Total impaired loans, Unpaid Principal Balance	19,189	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	863	5,931
Impaired loans with no related allowance, Unpaid Principal Balance	952	6,474
Total impaired loans, Recorded Investment	863	5,931
Total impaired loans, Unpaid Principal Balance	952	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	3,633	3,008
Impaired loans with no related allowance, Unpaid Principal Balance	3,657	3,044
Total impaired loans, Recorded Investment	3,633	3,008
Total impaired loans, Unpaid Principal Balance	3,657	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	789	512
Impaired loans with no related allowance, Unpaid Principal Balance	833	547
Total impaired loans, Recorded Investment	789	512
Total impaired loans, Unpaid Principal Balance	833	547
Total impaired loans, Related Allowance	0	0
Real Estate-Home Equity Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	160	184
Impaired loans with no related allowance, Unpaid Principal Balance	160	184
Total impaired loans, Recorded Investment	160	184
Total impaired loans, Unpaid Principal Balance	160	184
Total impaired loans, Related Allowance	$ 0	$ 0