Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary Of Impaired Loans Eval For Impairment) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$ 86,381	[1]	$ 101,565	[1]	$ 92,184	[1]
Related Allowance	8,197		14,607		8,265
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	56,596		101,989		70,045
Recorded Investment	142,977	[2]	203,554	[2]	162,229	[2]
Unpaid Principal Balance	168,203		229,615		195,455
Average Recorded Investment	145,257		209,208		170,658
Interest Income Recognized	1,915		2,636		8,920
Commercial | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	9,167		12,827		6,297
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	10,029		14,544		7,001
Related Allowance	2,459		3,627		1,078
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	9,340		13,034		6,611
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	120		230		354
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,789		13,963		9,890
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	14,415		17,153		16,333
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	8,179		14,344		13,928
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	208		226		1,043
Commercial | Franchise
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		125		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		1,544		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		1,189		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		26		0
Commercial | Mortgage warehouse line of credit
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Commercial | Community Advantage - homeowners association
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Commercial | Aircraft
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Commercial | Asset-based lending
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	670		511		282
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,465		511		294
Related Allowance	620		55		282
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	677		511		295
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	31		7		14
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		21		354
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		1,358		2,311
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		23		2,162
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		18		121
Commercial | Tax exempt
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Commercial | Leases
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Commercial | Other
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Commercial real-estate | Residential construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		1,881		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		2,007		0
Related Allowance	0		405		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		1,976		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		23		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	891		3,208		1,463
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	891		3,579		1,530
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,245		3,708		1,609
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	12		42		64
Commercial real-estate | Commercial construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3,099		8,682		3,099
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	3,099		8,682		3,099
Related Allowance	24		49		18
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,099		8,983		3,098
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	28		86		115
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,466		3,970		7,710
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,471		4,450		13,227
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,418		4,016		9,680
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	17		49		722
Commercial real-estate | Land
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	9,260		17,851		10,518
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	9,625		19,070		11,871
Related Allowance	174		2,380		259
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	9,688		17,861		10,323
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	79		104		411
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,982		11,305		5,035
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	8,764		16,304		8,813
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,985		12,048		5,384
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	109		203		418
Commercial real-estate | Office
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,712		5,792		7,792
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	9,398		5,996		8,444
Related Allowance	1,069		659		1,253
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	8,767		5,853		8,148
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	90		61		333
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	6,260		8,283		10,379
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,301		8,357		11,717
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	6,266		8,306		10,925
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	83		95		610
Commercial real-estate | Industrial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,597		4,229		3,385
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,765		4,286		3,506
Related Allowance	513		1,241		193
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,985		4,244		3,638
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	81		65		179
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,298		5,541		5,087
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,470		5,653		5,267
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,314		5,563		5,160
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	47		74		328
Commercial real-estate | Retail
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	12,763		16,734		17,511
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,903		17,316		17,638
Related Allowance	826		674		1,253
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	12,819		16,773		17,678
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	132		194		724
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	10,419		14,483		7,047
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	12,273		15,095		8,610
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	11,006		14,628		8,462
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	140		172		400
Commercial real-estate | Multi-family
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,053		3,966		3,237
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,143		4,063		3,730
Related Allowance	122		152		235
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,057		4,044		2,248
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	23		42		139
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,078		2,200		608
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,013		4,541		1,030
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,201		2,618		903
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	23		54		47
Commercial real-estate | Mixed use and other
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	25,420		18,910		28,935
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	25,591		20,337		29,051
Related Allowance	1,272		2,863		1,366
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	25,853		19,317		26,792
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	291		232		1,194
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,161		18,168		4,077
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	5,044		19,483		6,213
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,096		18,345		5,046
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	67		269		352
Home equity
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,109		5,160		3,985
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,534		5,751		5,238
Related Allowance	596		1,748		1,593
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,117		5,488		4,855
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	24		57		236
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,428		10,897		6,312
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	7,044		13,179		7,790
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,777		11,395		6,307
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	73		131		324
Residential real-estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,222		4,357		6,876
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,362		4,974		7,023
Related Allowance	427		598		626
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,094		4,365		6,335
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	68		49		273
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	11,541		8,627		10,761
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	14,427		9,053		13,585
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	11,699		8,703		9,443
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	137		94		393
Premium finance receivables | Commercial insurance loans
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Premium finance receivables | Life insurance loans
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Premium finance receivables | PCI - life insurance loans
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Consumer and other
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	309		665		267
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	367		665		269
Related Allowance	95		156		109
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	290		665		273
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	5		8		11
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,283		1,198		1,322
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,809		1,664		1,865
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,285		1,208		1,355
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	$ 27		$ 25		$ 115

[1] These impaired loans require an allowance for loan losses because the estimated fair value of the loans or related collateral is less than the recorded investment in the loans.

[2] Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.