Loans Financing Receivables Credit Quality Indicators (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Originated Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 9,132,625	$ 8,731,659	$ 8,099,928
Originated Loans [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,478,190	3,306,526	2,981,002
Originated Loans [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,214,857	2,224,416	2,124,760
Originated Loans [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	304,765	335,547	299,209
Originated Loans [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	188,353	139,236	84,507
Originated Loans [Member] | Grade 1 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	40,185	42,211	41,042
Originated Loans [Member] | Grade 1 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,250	0	0
Originated Loans [Member] | Grade 1 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Originated Loans [Member] | Grade 1 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	12,815	13,119	13,141
Originated Loans [Member] | Grade 2 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	124,748	114,480	94,362
Originated Loans [Member] | Grade 2 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,859	3,138	3,432
Originated Loans [Member] | Grade 2 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Originated Loans [Member] | Grade 2 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	709	179	114
Originated Loans [Member] | Grade 3 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	721,517	661,692	562,886
Originated Loans [Member] | Grade 3 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	297,052	254,749	313,337
Originated Loans [Member] | Grade 3 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	19,119	17,652	19,800
Originated Loans [Member] | Grade 3 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	36,743	20,042	9,372
Originated Loans [Member] | Grade 4 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,483,972	2,408,669	2,150,162
Originated Loans [Member] | Grade 4 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,826,543	1,845,686	1,647,565
Originated Loans [Member] | Grade 4 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	282,034	311,271	268,496
Originated Loans [Member] | Grade 4 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	134,834	104,037	61,522
Originated Loans [Member] | Grade 5 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	41,698	44,969	53,427
Originated Loans [Member] | Grade 5 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	32,705	53,675	67,758
Originated Loans [Member] | Grade 5 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,363	3,057	3,885
Originated Loans [Member] | Grade 5 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,042	1,561	0
Originated Loans [Member] | Grade 6 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	66,070	34,505	79,123
Originated Loans [Member] | Grade 6 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	53,448	67,168	92,668
Originated Loans [Member] | Grade 6 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,249	3,567	7,028
Originated Loans [Member] | Grade 6 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	210	298	358
Originated Loans [Member] | Grade 7 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Originated Loans [Member] | Grade 7 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Originated Loans [Member] | Grade 7 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Originated Loans [Member] | Grade 7 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	4,258,892
Acquired Loans [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,160,344
Acquired Loans [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,098,124
Acquired Loans [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	16,775
Acquired Loans [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 1 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 1 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 1 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 1 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 2 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	107
Acquired Loans [Member] | Grade 2 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 2 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 2 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 3 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	24,511
Acquired Loans [Member] | Grade 3 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	28,509
Acquired Loans [Member] | Grade 3 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 3 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 4 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,050,350
Acquired Loans [Member] | Grade 4 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	848,214
Acquired Loans [Member] | Grade 4 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	15,558
Acquired Loans [Member] | Grade 4 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 5 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	58,399
Acquired Loans [Member] | Grade 5 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	125,154
Acquired Loans [Member] | Grade 5 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,217
Acquired Loans [Member] | Grade 5 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 6 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	26,977
Acquired Loans [Member] | Grade 6 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	96,247
Acquired Loans [Member] | Grade 6 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 6 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 7 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 7 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 7 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Acquired Loans [Member] | Grade 7 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0
Covered Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	676,526	905,391	1,119,273
Covered Loans [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	85,931	128,509	166,988
Covered Loans [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	382,091	539,595	674,291
Covered Loans [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	37,685	50,333	73,759
Covered Loans [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans [Member] | Grade 1 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	36
Covered Loans [Member] | Grade 1 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans [Member] | Grade 1 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans [Member] | Grade 1 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans [Member] | Grade 2 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,001	1,526	2,090
Covered Loans [Member] | Grade 2 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans [Member] | Grade 2 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans [Member] | Grade 2 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans [Member] | Grade 3 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	90
Covered Loans [Member] | Grade 3 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	473
Covered Loans [Member] | Grade 3 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans [Member] | Grade 3 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans [Member] | Grade 4 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	44,148	73,480	96,675
Covered Loans [Member] | Grade 4 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	131,889	214,987	270,278
Covered Loans [Member] | Grade 4 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	556	476	491
Covered Loans [Member] | Grade 4 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans [Member] | Grade 5 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	661	3,215	6,768
Covered Loans [Member] | Grade 5 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	24,255	30,708	51,807
Covered Loans [Member] | Grade 5 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,364	1,331	595
Covered Loans [Member] | Grade 5 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans [Member] | Grade 6 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	38,065	47,468	52,396
Covered Loans [Member] | Grade 6 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	224,533	292,158	346,058
Covered Loans [Member] | Grade 6 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	33,856	45,838	69,851
Covered Loans [Member] | Grade 6 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans [Member] | Grade 7 [Member] | C&I
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,056	2,820	8,933
Covered Loans [Member] | Grade 7 [Member] | CRE
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,414	1,742	5,675
Covered Loans [Member] | Grade 7 [Member] | Construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,909	2,688	2,822
Covered Loans [Member] | Grade 7 [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 0	$ 0	$ 0