Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Impaired Loans Evaluated for Impairment by Loan Class) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$ 69,487	[1]	$ 92,184	[1]
Related Allowance	6,270		8,265
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	57,925		70,045
Impaired Financing Receivable, Recorded Investment	127,412	[2]	162,229	[2]
Impaired Financing Receivable, Unpaid Principal Balance	153,742		195,455
Impaired Financing Receivable, Average Recorded Investment	134,967		170,658		222,100
Impaired Financing Receivable, Interest Income, Accrual Method	7,190		8,920		10,800
Home equity
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,946		3,985
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,055		5,238
Related Allowance	475		1,593
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,995		4,855
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	80		236
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,453		6,312
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,172		7,790
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,666		6,307
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	256		324
Residential real estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,467		6,876
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,600		7,023
Related Allowance	606		626
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,399		6,335
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	241		273
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	12,640		10,761
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	14,334		13,585
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	12,682		9,443
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	595		393
Consumer and other
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	211		267
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	213		269
Related Allowance	26		109
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	214		273
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	10		11
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	161		1,322
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	222		1,865
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	173		1,355
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	11		115
Commercial and industrial | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	9,989		6,297
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	10,785		7,001
Related Allowance	1,915		1,078
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	10,784		6,611
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	539		354
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,797		9,890
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	8,862		16,333
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	6,664		13,928
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	595		1,043
Franchise | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Related Allowance	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0
Mortgage warehouse lines of credit | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Related Allowance	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0
Community Advanatage - homeowners association | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Related Allowance	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0
Aircraft | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Related Allowance	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0
Asset-based lending | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		282
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		294
Related Allowance	0		282
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		295
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		14
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	25		354
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,952		2,311
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	87		2,162
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	100		121
Tax exempt | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Related Allowance	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0
Leases | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Related Allowance	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0
Other | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Related Allowance	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0
Residential construction | Commercial real-estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Related Allowance	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		1,463
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		1,530
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		1,609
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		64
Commercial construction | Commercial real-estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		3,099
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		3,099
Related Allowance	0		18
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		3,098
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		115
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,875		7,710
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	3,085		13,227
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,183		9,680
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	151		722
Land | Commercial real-estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,011		10,518
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	8,626		11,871
Related Allowance	43		259
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,933		10,323
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	544		411
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	10,210		5,035
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	10,941		8,813
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,268		5,384
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	430		418
Office | Commercial real-estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	11,038		7,792
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,863		8,444
Related Allowance	305		1,253
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	11,567		8,148
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	576		333
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,132		10,379
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	5,020		11,717
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,445		10,925
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	216		610
Industrial | Commercial real-estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	195		3,385
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	277		3,506
Related Allowance	15		193
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	214		3,638
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	13		179
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,160		5,087
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	4,498		5,267
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,807		5,160
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	286		328
Retail | Commercial real-estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	11,045		17,511
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	14,566		17,638
Related Allowance	487		1,253
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	12,116		17,678
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	606		724
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,487		7,047
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	7,470		8,610
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	6,915		8,462
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	330		400
Multi-family | Commercial real-estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,808		3,237
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	3,321		3,730
Related Allowance	158		235
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,839		2,248
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	145		139
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		608
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		1,030
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		903
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		47
Mixed use and other | Commercial real-estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	21,777		28,935
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	24,076		29,051
Related Allowance	2,240		1,366
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	21,483		26,792
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1,017		1,194
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,985		4,077
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	8,804		6,213
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	9,533		5,046
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	449		352
Commercial insurance loans | Premium finance receivables
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Related Allowance	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0
Life insurance loans | Premium finance receivables
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Related Allowance	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0
PCI - life insurance loans | Premium finance receivables
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Related Allowance	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	$ 0		$ 0

[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.