Loans And Allowance For Loan Losses (Summary Of Impaired Loans, By Class) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 17,015
Specific Related Allowance	4,717
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	38,179	36,566
Unpaid Principal Balance	45,947	40,899
Specific Related Allowance	2,001	2,482
Average Recorded Investment	38,283	40,307
Interest Income Recognized	282	183
Commercial Real Estate - FL [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	13,975	39,122
Unpaid Principal Balance	26,145	64,357
Specific Related Allowance	2,389	2,389
Average Recorded Investment	18,821	46,189
Interest Income Recognized		54
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,503	7,816
Unpaid Principal Balance	10,992	8,721
Specific Related Allowance	327	2,276
Average Recorded Investment	8,567	8,213
Interest Income Recognized	51	37
Commercial Leases [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,141	1,084
Unpaid Principal Balance	1,141	1,084
Average Recorded Investment	1,201	1,217
Total Commercial Loans And Leases [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	60,798	84,588
Unpaid Principal Balance	84,225	115,061
Specific Related Allowance	4,717	7,147
Average Recorded Investment	66,872	95,926
Interest Income Recognized	333	274
Direct Installment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,316	7,162
Unpaid Principal Balance	4,500	7,522
Average Recorded Investment	5,744	7,530
Interest Income Recognized	104	207
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,908	9,544
Unpaid Principal Balance	7,017	9,839
Average Recorded Investment	8,388	10,278
Interest Income Recognized	156	175
Indirect Installment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,116	979
Unpaid Principal Balance	2,366	1,071
Average Recorded Investment	1,126	973
Interest Income Recognized	14	24
Consumer Lines Of Credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	435	747
Unpaid Principal Balance	460	761
Average Recorded Investment	433	947
Interest Income Recognized	4	8
Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,500	3,500
Unpaid Principal Balance	3,500	3,500
Average Recorded Investment	3,500	1,750
With No Specific Allowance Recorded [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	31,310	28,163
Unpaid Principal Balance	39,078	32,476
Average Recorded Investment	30,879	31,432
Interest Income Recognized	175	151
With No Specific Allowance Recorded [Member] | Commercial Real Estate - FL [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,422	28,721
Unpaid Principal Balance	8,798	46,162
Average Recorded Investment	8,844	29,630
Interest Income Recognized		33
With No Specific Allowance Recorded [Member] | Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,910	4,228
Unpaid Principal Balance	10,399	4,971
Average Recorded Investment	6,657	4,610
Interest Income Recognized	47	17
With No Specific Allowance Recorded [Member] | Commercial Leases [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,141	1,084
Unpaid Principal Balance	1,141	1,084
Average Recorded Investment	1,201	1,217
With No Specific Allowance Recorded [Member] | Total Commercial Loans And Leases [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	43,783	62,196
Unpaid Principal Balance	59,416	84,693
Average Recorded Investment	47,581	66,889
Interest Income Recognized	222	201
With No Specific Allowance Recorded [Member] | Direct Installment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,316	7,162
Unpaid Principal Balance	4,500	7,522
Average Recorded Investment	5,744	7,530
Interest Income Recognized	104	207
With No Specific Allowance Recorded [Member] | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,908	9,544
Unpaid Principal Balance	7,017	9,839
Average Recorded Investment	8,388	10,278
Interest Income Recognized	156	175
With No Specific Allowance Recorded [Member] | Indirect Installment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,116	979
Unpaid Principal Balance	2,366	1,071
Average Recorded Investment	1,126	973
Interest Income Recognized	14	24
With No Specific Allowance Recorded [Member] | Consumer Lines Of Credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	435	747
Unpaid Principal Balance	460	761
Average Recorded Investment	433	947
Interest Income Recognized	4	8
With No Specific Allowance Recorded [Member] | Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,500	3,500
Unpaid Principal Balance	3,500	3,500
Average Recorded Investment	3,500	1,750
With A Specific Allowance Recorded [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,869	8,403
Unpaid Principal Balance	6,869	8,423
Specific Related Allowance	2,001	2,482
Average Recorded Investment	7,404	8,875
Interest Income Recognized	107	32
With A Specific Allowance Recorded [Member] | Commercial Real Estate - FL [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,553	10,401
Unpaid Principal Balance	17,347	18,195
Specific Related Allowance	2,389	2,389
Average Recorded Investment	9,977	16,559
Interest Income Recognized		21
With A Specific Allowance Recorded [Member] | Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	593	3,588
Unpaid Principal Balance	593	3,750
Specific Related Allowance	327	2,276
Average Recorded Investment	1,910	3,603
Interest Income Recognized	4	20
With A Specific Allowance Recorded [Member] | Total Commercial Loans And Leases [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	17,015	22,392
Unpaid Principal Balance	24,809	30,368
Specific Related Allowance	4,717	7,147
Average Recorded Investment	19,291	29,037
Interest Income Recognized	$ 111	$ 73