Allowance for Non-Covered Loan Loss and Credit Quality (Internal Risk Rating By Loan Class) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	$ 14,830,345	$ 7,354,403	$ 6,797,890
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	8,850,609		4,224,077
Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	3,348,029	2,328,260
Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	2,666,128	1,259,583
Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	2,482,995	403,537
Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	261,767	245,231
Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	91,690	88,413
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	2,890,157		1,764,742
Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	1,104,206	770,845
LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	1,322,167	987,360
Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	463,784	361,591
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	2,757,768		767,055
Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	1,958,597	597,201
Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	799,171	264,269
Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	331,811	48,113	42,016
Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	14,168,541	6,865,393
Percentage of impaired loans	5.90%	6.40%
Pass/Watch [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	3,068,321	2,073,366
Pass/Watch [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	2,495,045	1,182,865
Pass/Watch [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	2,463,434	385,335
Pass/Watch [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	243,553	230,262
Pass/Watch [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	75,108	67,019
Pass/Watch [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	1,048,347	718,778
Pass/Watch [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	1,263,347	951,109
Pass/Watch [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	456,999	351,971
Pass/Watch [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	1,935,023	593,723
Pass/Watch [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	790,689	263,070
Pass/Watch [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	328,675	47,895
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	262,064	200,104
Percentage of impaired loans	2.60%	3.70%
Special Mention [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	114,558	108,263
Special Mention [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	66,195	27,615
Special Mention [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	7,848	5,574
Special Mention [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	4,892	2,054
Special Mention [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	797	1,836
Special Mention [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	19,866	23,393
Special Mention [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	32,938	24,197
Special Mention [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	1,492	4,585
Special Mention [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	6,092	1,405
Special Mention [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	5,025	1,038
Special Mention [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	2,361	144
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	274,009	183,114
Percentage of impaired loans	89.40%	89.90%
Substandard [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	112,571	96,984
Substandard [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	90,618	37,524
Substandard [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	6,883	11,693
Substandard [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	3,838	3,326
Substandard [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	1,687	1,855
Substandard [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	16,250	19,651
Substandard [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	21,541	9,574
Substandard [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	1,395	1,706
Substandard [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	15,789	743
Substandard [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	2,674	25
Substandard [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	763	33
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	7,287	3,169
Percentage of impaired loans	2.10%
Doubtful [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	455	0
Doubtful [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	2,130	173
Doubtful [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Doubtful [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Doubtful [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Doubtful [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	301	0
Doubtful [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	509	0
Doubtful [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	3,892	2,996
Doubtful [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Doubtful [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Doubtful [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	2,494	1,840
Loss [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Loss [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Loss [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Loss [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Loss [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Loss [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Loss [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Loss [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	6	333
Loss [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	1,693	1,330
Loss [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	783	136
Loss [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	12	41
Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	115,950	100,783
Impaired [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	52,124	49,647
Impaired [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	12,140	11,406
Impaired [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	4,830	935
Impaired [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	9,484	9,589
Impaired [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	14,098	17,703
Impaired [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	19,442	9,023
Impaired [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	3,832	2,480
Impaired [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Impaired [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Impaired [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	0	0
Impaired [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans and leases, net	$ 0	$ 0