Loans Receivable (Schedule Of Aging Of Non-Covered Loans) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Loans Receivable [Line Items]
Total non-covered loans, net of unearned income	$ 6,546,365		$ 6,053,588
Non-Covered Loans Excluding Acquired Loans [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	8,407	[1]	7,329	[1]
Past Due, 60-89 days	2,927	[1]	1,786	[1]
Past Due, Greater than 90 days	48,116	[1]	56,295	[1]
Total past due	59,449		65,410
Current	5,961,312		5,284,016
Total non-covered loans, net of unearned income	6,020,761		5,349,426
Recorded investment > 90 days and accruing	573		1,841
Non-Covered Loans Excluding Acquired Loans [Member] | Residential Mortgage Loans [Member] | Mortgage - Prime [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	1,111	[1]	731	[1]
Past Due, 60-89 days	1,465	[1]	325	[1]
Past Due, Greater than 90 days	6,417	[1]	6,009	[1]
Total past due	8,993		7,065
Current	225,291		271,534
Total non-covered loans, net of unearned income	234,284		278,599
Recorded investment > 90 days and accruing	491		1,099
Non-Covered Loans Excluding Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate-Construction [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	21	[1]	266	[1]
Past Due, Greater than 90 days	2,114	[1]	2,582	[1]
Total past due	2,135		2,848
Current	305,249		273,824
Total non-covered loans, net of unearned income	307,384		276,672
Non-Covered Loans Excluding Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate-Other [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	3,164	[1]	880	[1]
Past Due, 60-89 days	579	[1]	54	[1]
Past Due, Greater than 90 days	28,504	[1]	34,087	[1]
Total past due	32,247		35,021
Current	1,945,098		1,778,235
Total non-covered loans, net of unearned income	1,977,345		1,813,256
Recorded investment > 90 days and accruing	82		636
Non-Covered Loans Excluding Acquired Loans [Member] | Commercial Loans [Member] | Commercial Business [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	404	[1]	302	[1]
Past Due, 60-89 days	20	[1]	277	[1]
Past Due, Greater than 90 days	2,824	[1]	6,642	[1]
Total past due	3,248		7,221
Current	2,106,924		1,793,959
Total non-covered loans, net of unearned income	2,110,172		1,801,180
Recorded investment > 90 days and accruing			20
Non-Covered Loans Excluding Acquired Loans [Member] | Consumer And Other Loans [Member] | Indirect Automobile [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	731	[1]	1,232	[1]
Past Due, 60-89 days	188	[1]	159	[1]
Past Due, Greater than 90 days	867	[1]	994	[1]
Total past due	1,786		2,385
Current	300,565		248,070
Total non-covered loans, net of unearned income	302,351		250,455
Non-Covered Loans Excluding Acquired Loans [Member] | Consumer And Other Loans [Member] | Home Equity [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	2,545	[1]	3,102	[1]
Past Due, 60-89 days	529	[1]	717	[1]
Past Due, Greater than 90 days	6,462	[1]	4,955	[1]
Total past due	9,535		8,774
Current	871,770		741,968
Total non-covered loans, net of unearned income	881,305		750,742
Recorded investment > 90 days and accruing			82
Non-Covered Loans Excluding Acquired Loans [Member] | Consumer And Other Loans [Member] | Credit Card [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	120	[1]	467	[1]
Past Due, 60-89 days	47	[1]	107	[1]
Past Due, Greater than 90 days	372	[1]	403	[1]
Total past due	539		977
Current	45,154		46,786
Total non-covered loans, net of unearned income	45,693		47,763
Non-Covered Loans Excluding Acquired Loans [Member] | Consumer And Other Loans [Member] | Consumer - Other [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	311	[1]	349	[1]
Past Due, 60-89 days	99	[1]	147	[1]
Past Due, Greater than 90 days	556	[1]	623	[1]
Total past due	966		1,119
Current	161,261		129,640
Total non-covered loans, net of unearned income	162,227		130,759
Recorded investment > 90 days and accruing			4
Non-Covered Acquired Loans [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	6,420	[2]	11,242	[2]
Past Due, 60-89 days	1,307	[2]	4,845	[2]
Past Due, Greater than 90 days	44,383	[2]	39,237	[2]
Total past due	52,110		55,324
Current	535,763		720,636
Discount	(62,269)		(71,798)
Total non-covered loans, net of unearned income	525,604		704,162
Recorded investment > 90 days and accruing	701		1,915
Non-Covered Acquired Loans [Member] | Residential Mortgage Loans [Member] | Mortgage - Prime [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	39	[2]	124	[2]
Past Due, 60-89 days	60	[2]	60	[2]
Past Due, Greater than 90 days	280	[2]	185	[2]
Total past due	379		369
Current	593		4,145
Discount	(35)
Total non-covered loans, net of unearned income	937		4,514
Recorded investment > 90 days and accruing	280		185
Non-Covered Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate-Construction [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	445	[2]	629	[2]
Past Due, 60-89 days	33	[2]
Past Due, Greater than 90 days	2,556	[2]	3,755	[2]
Total past due	3,034		4,384
Current	35,080		61,705
Discount	(3,922)		(6,458)
Total non-covered loans, net of unearned income	34,192		59,631
Recorded investment > 90 days and accruing			345
Non-Covered Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate-Other [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	3,997	[2]	7,213	[2]
Past Due, 60-89 days	949	[2]	4,036	[2]
Past Due, Greater than 90 days	33,416	[2]	29,725	[2]
Total past due	38,362		40,974
Current	341,634		448,288
Discount	(38,408)		(47,808)
Total non-covered loans, net of unearned income	341,588		441,454
Recorded investment > 90 days and accruing	421		794
Non-Covered Acquired Loans [Member] | Commercial Loans [Member] | Commercial Business [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	212	[2]	183	[2]
Past Due, 60-89 days	219	[2]	69	[2]
Past Due, Greater than 90 days	4,036	[2]	639	[2]
Total past due	4,467		891
Current	76,945		105,796
Discount	(11,105)		(11,371)
Total non-covered loans, net of unearned income	70,307		95,316
Recorded investment > 90 days and accruing			3
Non-Covered Acquired Loans [Member] | Consumer And Other Loans [Member] | Indirect Automobile [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	126	[2]	171	[2]
Past Due, 60-89 days	10	[2]	10	[2]
Past Due, Greater than 90 days	143	[2]	258	[2]
Total past due	279		439
Current	7,208		10,813
Discount	17		189
Total non-covered loans, net of unearned income	7,504		11,441
Non-Covered Acquired Loans [Member] | Consumer And Other Loans [Member] | Home Equity [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	1,228	[2]	2,509	[2]
Past Due, 60-89 days			125	[2]
Past Due, Greater than 90 days	3,613	[2]	4,104	[2]
Total past due	4,841		6,738
Current	57,935		73,822
Discount	(2,018)		(4,839)
Total non-covered loans, net of unearned income	60,758		75,721
Recorded investment > 90 days and accruing			438
Non-Covered Acquired Loans [Member] | Consumer And Other Loans [Member] | Consumer - Other [Member]
Loans Receivable [Line Items]
Past Due, 30-59 days	373	[2]	413	[2]
Past Due, 60-89 days	36	[2]	545	[2]
Past Due, Greater than 90 days	339	[2]	571	[2]
Total past due	748		1,529
Current	16,368		16,067
Discount	(6,798)		(1,511)
Total non-covered loans, net of unearned income	10,318		16,085
Recorded investment > 90 days and accruing			$ 150

[1] Past due loans include loans on nonaccrual status as of the period indicated. Nonaccrual loans are presented separately in the "Nonaccrual Loans" section below

[2] Past due information includes loans acquired from OMNI and Cameron at the gross contractual balance outstanding at June 30, 2012 and December 31, 2011.