Loans and Leases (Schedule of Modifications for Troubled Debt Restructurings) (Detail) (TDRs [Member], USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014 Loans		Jun. 30, 2013 Loans		Jun. 30, 2014 Loans		Jun. 30, 2013 Loans
Financing Receivable Modifications [Line Items]
Number Of Loans	24		131		41		305
Pre-Modification Recorded Investment	$ 2,650,000		$ 7,187,000		$ 3,520,000		$ 25,069,000
Post-Modification Recorded Investment	2,650,000		7,187,000		3,520,000		25,069,000
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	8,000	[2]	56,000	[2]	(8,000)	[2]	(268,000)	[2]
Subsequently Defaulted [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans Subsequently Defaulted	11		24		44		63
Recorded Investment Subsequently Defaulted	1,213,000		7,196,000		5,182,000		9,380,000
Originated Loans And Leases [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans	21		121		37		287
Pre-Modification Recorded Investment	2,129,000		6,458,000		2,933,000		22,607,000
Post-Modification Recorded Investment	2,129,000		6,458,000		2,933,000		22,607,000
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	53,000	[2]	56,000	[2]	37,000	[2]	(225,000)	[2]
Originated Loans And Leases [Member] | Subsequently Defaulted [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans Subsequently Defaulted	10		22		40		58
Recorded Investment Subsequently Defaulted	1,093,000		6,859,000		2,536,000		8,843,000
Purchased Loans And Leases [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans	3		10		4		18
Pre-Modification Recorded Investment	521,000		729,000		587,000		2,462,000
Post-Modification Recorded Investment	521,000		729,000		587,000		2,462,000
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	(45,000)	[2]	0	[2]	(45,000)	[2]	(43,000)	[2]
Purchased Loans And Leases [Member] | Subsequently Defaulted [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans Subsequently Defaulted	1		2		4		5
Recorded Investment Subsequently Defaulted	120,000		337,000		2,646,000		537,000
Commercial, Financial, And Agricultural [Member] | Combination Of Modification Types [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans	0		1		0		1
Pre-Modification Recorded Investment	0		241,000		0		241,000
Post-Modification Recorded Investment	0		241,000		0		241,000
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	0	[2]	0	[2]	0	[2]	0	[2]
Commercial, Financial, And Agricultural [Member] | Bankruptcies And Maturity Date Extensions [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans	0		11		6		23
Pre-Modification Recorded Investment	0		1,041,000		102,000		8,534,000
Post-Modification Recorded Investment	0		1,041,000		102,000		8,534,000
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	0	[2]	0	[2]	0	[2]	0	[2]
Commercial, Financial, And Agricultural [Member] | Subsequently Defaulted [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans Subsequently Defaulted	3		5		11		12
Recorded Investment Subsequently Defaulted	998,000		6,621,000		2,027,000		7,301,000
Real Estate - Construction [Member] | Combination Of Modification Types [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans	0		0		0		0
Pre-Modification Recorded Investment	0		0		0		0
Post-Modification Recorded Investment	0		0		0		0
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	0	[2]	0	[2]	0	[2]	0	[2]
Real Estate - Construction [Member] | Bankruptcies And Maturity Date Extensions [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans	0		1		0		2
Pre-Modification Recorded Investment	0		117,000		0		137,000
Post-Modification Recorded Investment	0		117,000		0		137,000
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	0	[2]	0	[2]	0	[2]	0	[2]
Real Estate - Construction [Member] | Subsequently Defaulted [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans Subsequently Defaulted	0		0		0		2
Recorded Investment Subsequently Defaulted	0		0		0		137,000
Real Estate Secured - Residential [Member] | Combination Of Modification Types [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans	4		10		7		17
Pre-Modification Recorded Investment	793,000		1,186,000		1,100,000		2,502,000
Post-Modification Recorded Investment	793,000		1,186,000		1,100,000		2,502,000
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	8,000	[2]	56,000	[2]	(8,000)	[2]	(72,000)	[2]
Real Estate Secured - Residential [Member] | Bankruptcies And Maturity Date Extensions [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans	7		40		13		99
Pre-Modification Recorded Investment	1,401,000		2,912,000		1,851,000		8,323,000
Post-Modification Recorded Investment	1,401,000		2,912,000		1,851,000		8,323,000
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	0	[2]	0	[2]	0	[2]	0	[2]
Real Estate Secured - Residential [Member] | Subsequently Defaulted [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans Subsequently Defaulted	2		5		8		13
Recorded Investment Subsequently Defaulted	179,000		509,000		397,000		1,290,000
Real Estate Secured - Commercial [Member] | Combination Of Modification Types [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans	1		0		1		1
Pre-Modification Recorded Investment	375,000		0		375,000		1,436,000
Post-Modification Recorded Investment	375,000		0		375,000		1,436,000
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	0	[2]	0	[2]	0	[2]	(196,000)	[2]
Real Estate Secured - Commercial [Member] | Bankruptcies And Maturity Date Extensions [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans	0		5		0		12
Pre-Modification Recorded Investment	0		949,000		0		2,499,000
Post-Modification Recorded Investment	0		949,000		0		2,499,000
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	0	[2]	0	[2]	0	[2]	0	[2]
Real Estate Secured - Commercial [Member] | Subsequently Defaulted [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans Subsequently Defaulted	0		0		4		3
Recorded Investment Subsequently Defaulted	0		0		2,599,000		447,000
Consumer [Member] | Combination Of Modification Types [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans	0		0		0		0
Pre-Modification Recorded Investment	0		0		0		0
Post-Modification Recorded Investment	0		0		0		0
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	0	[2]	0	[2]	0	[2]	0	[2]
Consumer [Member] | Bankruptcies And Maturity Date Extensions [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans	12		63		14		150
Pre-Modification Recorded Investment	81,000		741,000		92,000		1,397,000
Post-Modification Recorded Investment	81,000		741,000		92,000		1,397,000
Financial Effect Of Modification On Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Financial Effect Of Modification On Interest	0	[2]	0	[2]	0	[2]	0	[2]
Consumer [Member] | Subsequently Defaulted [Member]
Financing Receivable Modifications [Line Items]
Number Of Loans Subsequently Defaulted	6		14		21		33
Recorded Investment Subsequently Defaulted	$ 36,000		$ 66,000		$ 159,000		$ 205,000

[1] Financial effects impacting the recorded investment include principal payments, advances, charge-offs, and capitalized past-due amounts.

[2] Represents the present value of interest rate concessions discounted at the effective rate of the original loan.