Loans and Leases (Troubled Debt Restructurings By Class Segment) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013	Dec. 31, 2013		Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable Modifications [Line Items]
Total performing TDRs	$ 40,938			$ 40,938			$ 72,133
TDRs [Member]
Financing Receivable Modifications [Line Items]
Total performing TDRs	40,938		63,822	40,938		63,822	72,133		39,555	65,773	67,775
Non-performing TDRs	20,465	[1]	20,500	20,465	[1]	20,500	22,676	[1]
Total TDRs	61,403			61,403			94,809
Performing TDRs	67.00%		76.00%	67.00%		76.00%	76.00%
Non-performing TDRs	33.00%		24.00%	33.00%		24.00%	24.00%
Commercial, Financial, And Agricultural [Member] | TDRs [Member]
Financing Receivable Modifications [Line Items]
Total performing TDRs	4,228			4,228			6,885
Real Estate - Construction [Member] | TDRs [Member]
Financing Receivable Modifications [Line Items]
Total performing TDRs	322			322			615
Real Estate Secured - Residential [Member] | TDRs [Member]
Financing Receivable Modifications [Line Items]
Total performing TDRs	18,414			18,414			31,623
Real Estate Secured - Commercial [Member] | TDRs [Member]
Financing Receivable Modifications [Line Items]
Total performing TDRs	16,903			16,903			31,295
Consumer [Member] | TDRs [Member]
Financing Receivable Modifications [Line Items]
Total performing TDRs	$ 1,071			$ 1,071			$ 1,715

[1] These loans are included in the 90 day past due and non-accrual categories.