Allowance for Loan and Lease Loss and Credit Quality (Internal Risk Rating By Loan Class) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	$ 15,327,732	$ 7,728,166
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	8,903,660	4,630,155
Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,290,610	2,535,162
Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,633,864	1,309,400
Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,638,618	441,208
Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	258,722	248,686
Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	81,846	95,699
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,948,823	2,142,213
Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,102,987	786,564
LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,322,722	994,058
Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	523,114	361,591
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,086,213	903,423
Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,233,735	619,517
Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	852,478	283,906
Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	389,036	52,375
Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	14,729,543	7,110,649
Percentage of impaired loans	5.60%	6.40%
Pass/Watch [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,027,777	2,207,603
Pass/Watch [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,475,944	1,213,321
Pass/Watch [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,610,039	409,626
Pass/Watch [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	248,547	231,380
Pass/Watch [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	68,789	67,513
Pass/Watch [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,055,728	722,723
Pass/Watch [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,281,628	955,826
Pass/Watch [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	513,104	351,971
Pass/Watch [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,215,956	616,039
Pass/Watch [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	846,277	282,490
Pass/Watch [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	385,754	52,157
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	213,806	237,345
Percentage of impaired loans	15.10%	3.70%
Special Mention [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	99,556	135,005
Special Mention [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	58,425	31,071
Special Mention [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	9,583	8,213
Special Mention [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	4,081	2,054
Special Mention [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	963	2,060
Special Mention [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	12,661	26,548
Special Mention [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	17,665	25,222
Special Mention [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,554	4,585
Special Mention [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,330	1,405
Special Mention [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,271	1,038
Special Mention [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,717	144
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	261,400	273,751
Percentage of impaired loans	77.90%	89.90%
Substandard [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	123,350	142,907
Substandard [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	81,567	53,181
Substandard [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	15,177	22,434
Substandard [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	5,003	5,663
Substandard [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,419	8,329
Substandard [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	15,219	27,983
Substandard [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	9,082	10,530
Substandard [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,809	1,706
Substandard [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	4,497	743
Substandard [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,079	242
Substandard [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	198	33
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	4,863	3,798
Percentage of impaired loans	0.10%
Doubtful [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	821	0
Doubtful [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	309	421
Doubtful [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Doubtful [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Doubtful [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	94
Doubtful [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	198	287
Doubtful [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	280	0
Doubtful [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,255	2,996
Doubtful [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Doubtful [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Doubtful [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	15,548	1,840
Percentage of impaired loans	1.30%
Loss [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Loss [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,674	0
Loss [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Loss [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Loss [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Loss [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	224	0
Loss [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	88	0
Loss [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	392	333
Loss [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	10,952	1,330
Loss [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,851	136
Loss [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	367	41
Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	102,572	100,783
Impaired [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	39,106	49,647
Impaired [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	15,945	11,406
Impaired [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,819	935
Impaired [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,091	9,589
Impaired [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	9,675	17,703
Impaired [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	18,957	9,023
Impaired [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	13,979	2,480
Impaired [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Impaired [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Impaired [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Impaired [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	$ 0	$ 0