Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Feb. 13, 2015	Dec. 31, 2014	Jan. 01, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 1,788,136	$ 1,754,882
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	1,186,498	1,029,426
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			$ 154,496		$ 316,327
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Accretion	91,642	89,775
Reductions for repayments, foreclosures and changes in carrying value, net of accretion	(388,572)	(439,248)
Ending balance	1,044,064	$ 996,280
Loans on the Cost Recovery Method
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans on cost recovery method	6,900			$ 33,400
Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	726,123
Ending balance	646,961
Noncommerical
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	460,375
Ending balance	397,103
Construction and land development | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	78,079
Ending balance	41,582
Construction and land development | Noncommerical
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	912
Ending balance	347
Mortgage | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	577,518
Ending balance	568,256
Mortgage | Noncommerical
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	382,340
Ending balance	334,518
Other commercial real estate | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	40,193
Ending balance	18,013
Commercial and industrial | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	27,254
Ending balance	17,023
Consumer | Noncommerical
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	3,014
Ending balance	2,543
Capitol City Bank and Trust
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			154,496
Capitol City Bank and Trust | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			139,894
Capitol City Bank and Trust | Noncommerical
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			14,602
Capitol City Bank and Trust | Construction and land development | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			4,116
Capitol City Bank and Trust | Mortgage | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			129,732
Capitol City Bank and Trust | Mortgage | Noncommerical
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			13,251
Capitol City Bank and Trust | Other commercial real estate | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			3,202
Capitol City Bank and Trust | Commercial and industrial | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			2,844
Capitol City Bank and Trust | Consumer | Noncommerical
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			$ 1,351
PCI Loans
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	1,186,498
Ending balance	1,044,064
Nonaccruing	$ 5,329			$ 33,422