Loans and the Allowance for Loan Losses (Details 12) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Investment in loans, net of unearned income on impairment methodology
Individually evaluated for impairment	$ 55,077		$ 56,924
Collectively evaluated for impairment	3,386,982		3,375,164
Acquired with deteriorated credit quality	425,369		448,930
Loans, net of unearned income	3,867,428		3,881,018
Commercial
Investment in loans, net of unearned income on impairment methodology
Individually evaluated for impairment	723		743
Collectively evaluated for impairment	408,547		432,736
Acquired with deteriorated credit quality	30,846		35,484
Loans, net of unearned income	440,116		468,963
Real Estate - Construction
Investment in loans, net of unearned income on impairment methodology
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	153,128		158,551
Acquired with deteriorated credit quality	2,772		2,885
Loans, net of unearned income	155,900		161,436
Real estate – 1-4 family mortgage
Investment in loans, net of unearned income on impairment methodology
Individually evaluated for impairment	21,831		25,374
Collectively evaluated for impairment	1,091,100		1,080,297
Acquired with deteriorated credit quality	98,329		102,562
Loans, net of unearned income	1,211,260		1,208,233
Real estate – commercial mortgage
Investment in loans, net of unearned income on impairment methodology
Individually evaluated for impairment	32,523		30,624
Collectively evaluated for impairment	1,648,379		1,618,758
Acquired with deteriorated credit quality	287,256		301,190
Loans, net of unearned income	1,968,158		1,950,572
Installment and Other
Investment in loans, net of unearned income on impairment methodology
Individually evaluated for impairment	0	[1]	183	[1]
Collectively evaluated for impairment	85,828	[1]	84,822	[1]
Acquired with deteriorated credit quality	6,166	[1]	6,809	[1]
Loans, net of unearned income	$ 91,994	[1]	$ 91,814	[1]

[1] Includes lease financing receivables.