Loans (Schedule Of Impaired Loans Excluding Covered Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011	Jun. 30, 2011
Loans [Line Items]
Unpaid Contractual Principal Balance	$ 325,948		$ 402,712
Recorded Investment With No Specific Reserve	142,122		151,912
Recorded Investment With Specific Reserve	164,907		208,849
Total Recorded Investment	307,029	[1]	360,761	455,062	[1]
Specific Reserve	58,097	[1]	69,944	71,686	[1]
Commercial Loan [Member]
Loans [Line Items]
Unpaid Contractual Principal Balance	142,273		118,118
Recorded Investment With No Specific Reserve	88,348		57,230
Recorded Investment With Specific Reserve	53,711		46,098
Total Recorded Investment	142,059		103,328
Specific Reserve	17,975		14,163
Commercial Real Estate [Member]
Loans [Line Items]
Unpaid Contractual Principal Balance	147,973		190,486
Recorded Investment With No Specific Reserve	44,084		65,571
Recorded Investment With Specific Reserve	88,337		114,233
Total Recorded Investment	132,421		179,804
Specific Reserve	30,786		38,905
Construction Loans [Member]
Loans [Line Items]
Unpaid Contractual Principal Balance	1,182		24,135
Recorded Investment With No Specific Reserve			1,548
Recorded Investment With Specific Reserve	555		20,331
Total Recorded Investment	555		21,879
Specific Reserve	146		5,202
Residential Real Estate [Member]
Loans [Line Items]
Unpaid Contractual Principal Balance	12,727		18,577
Recorded Investment With No Specific Reserve	6,676		10,502
Recorded Investment With Specific Reserve	5,226		7,325
Total Recorded Investment	11,902		17,827
Specific Reserve	1,629		976
Home Equity Line of Credit [Member]
Loans [Line Items]
Unpaid Contractual Principal Balance	14,963		12,881
Recorded Investment With No Specific Reserve	3,014		2,310
Recorded Investment With Specific Reserve	10,670		9,293
Total Recorded Investment	13,684		11,603
Specific Reserve	2,864		1,272
Consumer Loan [Member]
Loans [Line Items]
Unpaid Contractual Principal Balance	6,830		38,515
Recorded Investment With No Specific Reserve			14,751
Recorded Investment With Specific Reserve	6,408		11,569
Total Recorded Investment	6,408		26,320
Specific Reserve	$ 4,697		$ 9,426

[1] Refer to Note 4 for additional information regarding impaired loans.