Allowance for Non-Covered Loan Loss and Credit Quality (Non-Covered Non-Accrual Loans And Loans Past Due) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 9,720,000	$ 10,252,000
60-89 Days Past Due	19,193,000	5,038,000
Greater Than 90 Days and Accruing	4,919,000	3,430,000
Total Past Due	33,832,000	18,720,000
Nonaccrual	48,358,000	31,891,000
Current	14,748,155,000	7,303,792,000
Total loans and leases, net of deferred fees and costs	14,830,345,000	7,354,403,000	6,797,890,000
Purchased impaired non-covered loans	402,500,000	21,900,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases, net of deferred fees and costs	8,850,609,000		4,224,077,000
Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	907,000	3,618,000
60-89 Days Past Due	3,242,000	352,000
Greater Than 90 Days and Accruing	298,000	0
Total Past Due	4,447,000	3,970,000
Nonaccrual	17,689,000	9,193,000
Current	3,325,893,000	2,315,097,000
Total loans and leases, net of deferred fees and costs	3,348,029,000	2,328,260,000
Owner Occupied Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,700,000	1,320,000
60-89 Days Past Due	6,018,000	340,000
Greater Than 90 Days and Accruing	0	610,000
Total Past Due	8,718,000	2,270,000
Nonaccrual	4,442,000	6,204,000
Current	2,652,968,000	1,251,109,000
Total loans and leases, net of deferred fees and costs	2,666,128,000	1,259,583,000
Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	516,000	0
Greater Than 90 Days and Accruing	0	0
Total Past Due	516,000	0
Nonaccrual	1,311,000	935,000
Current	2,481,168,000	402,602,000
Total loans and leases, net of deferred fees and costs	2,482,995,000	403,537,000
Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	1,804,000	0
Greater Than 90 Days and Accruing	0	0
Total Past Due	1,804,000	0
Nonaccrual	0	0
Current	259,963,000	245,231,000
Total loans and leases, net of deferred fees and costs	261,767,000	245,231,000
Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Greater Than 90 Days and Accruing	0	0
Total Past Due	0	0
Nonaccrual	0	2,801,000
Current	91,690,000	85,612,000
Total loans and leases, net of deferred fees and costs	91,690,000	88,413,000
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases, net of deferred fees and costs	2,890,157,000		1,764,742,000
Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	443,000	901,000
60-89 Days Past Due	512,000	1,436,000
Greater Than 90 Days and Accruing	0	0
Total Past Due	955,000	2,337,000
Nonaccrual	19,142,000	8,723,000
Current	1,084,109,000	759,785,000
Total loans and leases, net of deferred fees and costs	1,104,206,000	770,845,000
LOC & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,534,000	619,000
60-89 Days Past Due	952,000	224,000
Greater Than 90 Days and Accruing	225,000	0
Total Past Due	2,711,000	843,000
Nonaccrual	2,587,000	1,222,000
Current	1,316,869,000	985,295,000
Total loans and leases, net of deferred fees and costs	1,322,167,000	987,360,000
Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,156,000	2,202,000
60-89 Days Past Due	1,343,000	1,706,000
Greater Than 90 Days and Accruing	638,000	517,000
Total Past Due	3,137,000	4,425,000
Nonaccrual	3,153,000	2,813,000
Current	457,494,000	354,353,000
Total loans and leases, net of deferred fees and costs	463,784,000	361,591,000
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases, net of deferred fees and costs	2,757,768,000		767,055,000
Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	94,000	1,050,000
60-89 Days Past Due	4,001,000	342,000
Greater Than 90 Days and Accruing	2,889,000	2,070,000
Total Past Due	6,984,000	3,462,000
Nonaccrual	0	0
Current	1,951,613,000	593,739,000
Total loans and leases, net of deferred fees and costs	1,958,597,000	597,201,000
Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,555,000	473,000
60-89 Days Past Due	417,000	563,000
Greater Than 90 Days and Accruing	830,000	160,000
Total Past Due	2,802,000	1,196,000
Nonaccrual	0	0
Current	796,369,000	263,073,000
Total loans and leases, net of deferred fees and costs	799,171,000	264,269,000
Consumer & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,331,000	69,000
60-89 Days Past Due	388,000	75,000
Greater Than 90 Days and Accruing	39,000	73,000
Total Past Due	1,758,000	217,000
Nonaccrual	34,000	0
Current	330,019,000	47,896,000
Total loans and leases, net of deferred fees and costs	$ 331,811,000	$ 48,113,000	$ 42,016,000