Loans And Allowance For Loan Losses (Summary Of Changes In Allowance For Loan Losses By Class) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Balance at Beginning of Period	$ 101,647	$ 109,224	$ 100,662	$ 106,120
Charge-Offs	(9,220)	(9,729)	(23,563)	(24,632)
Recoveries	1,858	745	3,587	1,973
Net Charge-Offs	(7,362)	(8,984)	(19,976)	(22,659)
Provision for Loan Losses	8,429	8,573	22,028	25,352
Balance at End of Period	102,714	108,813	102,714	108,813
Commercial Real Estate [Member]
Balance at Beginning of Period	29,989	34,215	30,337	32,439
Charge-Offs	(1,364)	(1,569)	(3,804)	(4,995)
Recoveries	186	143	436	337
Net Charge-Offs	(1,178)	(1,426)	(3,368)	(4,658)
Provision for Loan Losses	(430)	112	1,412	5,120
Balance at End of Period	28,381	32,901	28,381	32,901
Commercial Real Estate - FL [Member]
Balance at Beginning of Period	8,491	20,018	12,946	17,485
Charge-Offs	(117)	(3,481)	(929)	(4,761)
Recoveries	1,189		1,198
Net Charge-Offs	1,072	(3,481)	269	(4,761)
Provision for Loan Losses	(2,930)	3,941	(6,582)	7,754
Balance at End of Period	6,633	20,478	6,633	20,478
Commercial And Industrial [Member]
Balance at Beginning of Period	30,779	23,725	25,476	24,682
Charge-Offs	(3,746)	(694)	(7,086)	(3,016)
Recoveries	(19)	107	349	242
Net Charge-Offs	(3,765)	(587)	(6,737)	(2,774)
Provision for Loan Losses	4,861	904	13,136	2,134
Balance at End of Period	31,875	24,042	31,875	24,042
Commercial Leases [Member]
Balance at Beginning of Period	1,674	1,273	1,556	1,070
Charge-Offs	(216)	(173)	(509)	(378)
Recoveries	78	28	177	58
Net Charge-Offs	(138)	(145)	(332)	(320)
Provision for Loan Losses	214	289	526	667
Balance at End of Period	1,750	1,417	1,750	1,417
Total Commercial Loans And Leases [Member]
Balance at Beginning of Period	70,933	79,231	70,315	75,676
Charge-Offs	(5,443)	(5,917)	(12,328)	(13,150)
Recoveries	1,434	278	2,160	637
Net Charge-Offs	(4,009)	(5,639)	(10,168)	(12,513)
Provision for Loan Losses	1,715	5,246	8,492	15,675
Balance at End of Period	68,639	78,838	68,639	78,838
Direct Installment [Member]
Balance at Beginning of Period	14,536	14,915	14,814	14,941
Charge-Offs	(1,985)	(1,920)	(5,908)	(6,422)
Recoveries	225	212	721	646
Net Charge-Offs	(1,760)	(1,708)	(5,187)	(5,776)
Provision for Loan Losses	1,929	1,371	5,078	5,413
Balance at End of Period	14,705	14,578	14,705	14,578
Residential Mortgage [Member]
Balance at Beginning of Period	4,259	4,480	4,437	4,578
Charge-Offs	(3)	(233)	(644)	(640)
Recoveries	4	14	127	45
Net Charge-Offs	1	(219)	(517)	(595)
Provision for Loan Losses	256	95	596	373
Balance at End of Period	4,516	4,356	4,516	4,356
Indirect Installment [Member]
Balance at Beginning of Period	5,666	5,705	5,503	5,941
Charge-Offs	(688)	(775)	(2,128)	(2,312)
Recoveries	158	121	433	415
Net Charge-Offs	(530)	(654)	(1,695)	(1,897)
Provision for Loan Losses	539	594	1,867	1,601
Balance at End of Period	5,675	5,645	5,675	5,645
Consumer Lines Of Credit [Member]
Balance at Beginning of Period	5,266	4,796	5,447	4,743
Charge-Offs	(831)	(285)	(1,585)	(1,103)
Recoveries	37	97	146	184
Net Charge-Offs	(794)	(188)	(1,439)	(919)
Provision for Loan Losses	1,556	774	2,020	1,558
Balance at End of Period	6,028	5,382	6,028	5,382
Other [Member]
Balance at Beginning of Period	203	97	146	241
Charge-Offs	(270)	(599)	(716)	(1,005)
Recoveries		23		46
Net Charge-Offs	(270)	(576)	(716)	(959)
Provision for Loan Losses	229	493	732	732
Balance at End of Period	162	14	162	14
Purchased Credit-Impaired Loans [Member]
Balance at Beginning of Period	784
Charge-Offs			(254)
Net Charge-Offs			(254)
Provision for Loan Losses	2,205		3,243
Balance at End of Period	$ 2,989		$ 2,989