Loans Past Due Financing Receivables (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Legacy Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	$ 27,902	$ 36,485	$ 37,193
60 to 89 Days Past Due	11,219	13,390	8,483
Equal to Greater than 90 Days Past Due	26,788	26,089	49,556
Total Past Due	65,909	75,964	95,232
Current	8,659,930	8,601,536	7,668,827
Total Loans	8,725,839	8,677,500	7,764,059
90 Days Past Due and Still Accruing	12,209	9,384	9,261
Nonaccrual Loans	37,353	33,922	51,763
Legacy Loans [Member] | Commercial and Industrial Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	3,828	3,814	9,683
60 to 89 Days Past Due	1,372	1,788	598
Equal to Greater than 90 Days Past Due	4,188	3,571	4,464
Total Past Due	9,388	9,173	14,745
Current	3,369,057	3,294,527	2,858,427
Total Loans	3,378,445	3,303,700	2,873,172
90 Days Past Due and Still Accruing	0	104	260
Nonaccrual Loans	8,274	5,255	5,450
Legacy Loans [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	2,872	4,181	7,066
60 to 89 Days Past Due	3,442	4,483	2,270
Equal to Greater than 90 Days Past Due	8,668	8,901	23,439
Total Past Due	14,982	17,565	32,775
Current	2,149,975	2,175,967	1,951,798
Total Loans	2,164,957	2,193,532	1,984,573
90 Days Past Due and Still Accruing	1,683	382	614
Nonaccrual Loans	11,676	13,018	32,145
Legacy Loans [Member] | Commercial Construction Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	0	981	279
60 to 89 Days Past Due	0	0	0
Equal to Greater than 90 Days Past Due	1,134	597	5,309
Total Past Due	1,134	1,578	5,588
Current	309,591	333,969	280,127
Total Loans	310,725	335,547	285,715
90 Days Past Due and Still Accruing	1,058	0	0
Nonaccrual Loans	439	731	5,451
Legacy Loans [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	0	6	775
60 to 89 Days Past Due	0	0	0
Equal to Greater than 90 Days Past Due	0	0	0
Total Past Due	0	6	775
Current	164,137	139,230	73,337
Total Loans	164,137	139,236	74,112
90 Days Past Due and Still Accruing	0	0	0
Nonaccrual Loans	0	0	0
Legacy Loans [Member] | Consumer Installment Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	7,778	11,722	7,979
60 to 89 Days Past Due	2,614	3,193	2,226
Equal to Greater than 90 Days Past Due	4,932	5,608	4,380
Total Past Due	15,324	20,523	14,585
Current	1,305,753	1,305,921	1,243,165
Total Loans	1,321,077	1,326,444	1,257,750
90 Days Past Due and Still Accruing	4,321	4,909	4,141
Nonaccrual Loans	4,695	2,911	434
Legacy Loans [Member] | Consumer Home Equity Lines Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	1,287	1,584	2,229
60 to 89 Days Past Due	479	880	469
Equal to Greater than 90 Days Past Due	1,172	1,227	1,126
Total Past Due	2,938	3,691	3,824
Current	792,540	784,988	717,013
Total Loans	795,478	788,679	720,837
90 Days Past Due and Still Accruing	275	475	556
Nonaccrual Loans	2,275	1,557	1,113
Legacy Loans [Member] | Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	825	969	913
60 to 89 Days Past Due	580	558	476
Equal to Greater than 90 Days Past Due	773	954	809
Total Past Due	2,178	2,481	2,198
Current	138,543	143,906	138,420
Total Loans	140,721	146,387	140,618
90 Days Past Due and Still Accruing	364	438	309
Nonaccrual Loans	510	598	522
Legacy Loans [Member] | Consumer Residential Mortgages Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	11,312	13,228	8,269
60 to 89 Days Past Due	2,732	2,488	2,444
Equal to Greater than 90 Days Past Due	5,921	5,231	10,029
Total Past Due	19,965	20,947	20,742
Current	430,334	423,028	406,540
Total Loans	450,299	443,975	427,282
90 Days Past Due and Still Accruing	4,508	3,076	3,381
Nonaccrual Loans	9,484	9,852	6,648
Acquired Loans Noncovered [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	133	63	1,038
60 to 89 Days Past Due	370	245	39
Equal to Greater than 90 Days Past Due	2,835	2,665	771
Total Past Due	3,338	2,973	1,848
Current	50,793	51,186	97,302
Total Loans	54,131	54,159	99,150
90 Days Past Due and Still Accruing	184	33	0
Nonaccrual Loans	3,456	2,765	1,500
Acquired Loans Noncovered [Member] | Commercial and Industrial Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	0	0	0
60 to 89 Days Past Due	0	198	0
Equal to Greater than 90 Days Past Due	0	0	65
Total Past Due	0	198	65
Current	4,179	2,628	17,488
Total Loans	4,179	2,826	17,553
90 Days Past Due and Still Accruing	0	0	0
Nonaccrual Loans	0	0	70
Acquired Loans Noncovered [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	0	0	818
60 to 89 Days Past Due	324	47	0
Equal to Greater than 90 Days Past Due	2,696	2,634	706
Total Past Due	3,020	2,681	1,524
Current	27,011	28,203	57,514
Total Loans	30,031	30,884	59,038
90 Days Past Due and Still Accruing	0	0	0
Nonaccrual Loans	3,454	2,762	1,430
Acquired Loans Noncovered [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0	0
Acquired Loans Noncovered [Member] | Consumer Installment Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	19	0	0
60 to 89 Days Past Due	29	0	14
Equal to Greater than 90 Days Past Due	0	31	0
Total Past Due	48	31	14
Current	1,670	1,783	2,166
Total Loans	1,718	1,814	2,180
90 Days Past Due and Still Accruing	0	33	0
Nonaccrual Loans	2	3	0
Acquired Loans Noncovered [Member] | Consumer Home Equity Lines Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	51	0	220
60 to 89 Days Past Due	17	0	25
Equal to Greater than 90 Days Past Due	139	0	0
Total Past Due	207	0	245
Current	16,773	17,399	18,466
Total Loans	16,980	17,399	18,711
90 Days Past Due and Still Accruing	184	0	0
Nonaccrual Loans	0	0	0
Acquired Loans Noncovered [Member] | Consumer Residential Mortgages Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	63	63	0
60 to 89 Days Past Due	0	0	0
Equal to Greater than 90 Days Past Due	0	0	0
Total Past Due	63	63	0
Current	1,160	1,173	1,668
Total Loans	1,223	1,236	1,668
90 Days Past Due and Still Accruing	0	0	0
Nonaccrual Loans	0	0	0
Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	15,738	17,184	47,959
60 to 89 Days Past Due	15,845	25,086	18,449
Equal to Greater than 90 Days Past Due	227,187	240,864	264,059
Total Past Due	258,770	283,134	330,467
Current	542,469	622,257	876,547
Total Loans	801,239	905,391	1,207,014
Covered Loans [Member] | Commercial and Industrial Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	1,685	931	3,736
60 to 89 Days Past Due	1,038	981	105
Equal to Greater than 90 Days Past Due	21,343	24,111	28,654
Total Past Due	24,066	26,023	32,495
Current	87,357	102,486	149,471
Total Loans	111,423	128,509	181,966
Covered Loans [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	2,617	4,130	29,417
60 to 89 Days Past Due	13,964	15,019	3,318
Equal to Greater than 90 Days Past Due	161,256	172,444	162,963
Total Past Due	177,837	191,593	195,698
Current	290,125	348,002	530,405
Total Loans	467,962	539,595	726,103
Covered Loans [Member] | Commercial Construction Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	0	589	1,695
60 to 89 Days Past Due	0	7,925	11,688
Equal to Greater than 90 Days Past Due	36,157	34,314	57,628
Total Past Due	36,157	42,828	71,011
Current	5,646	7,505	12,208
Total Loans	41,803	50,333	83,219
Covered Loans [Member] | Commercial Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0	0
Covered Loans [Member] | Consumer Installment Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	20	1	23
60 to 89 Days Past Due	0	65	0
Equal to Greater than 90 Days Past Due	41	21	22
Total Past Due	61	87	45
Current	8,020	8,102	9,163
Total Loans	8,081	8,189	9,208
Covered Loans [Member] | Consumer Home Equity Lines Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	1,567	1,528	1,093
60 to 89 Days Past Due	119	654	1,141
Equal to Greater than 90 Days Past Due	1,881	2,211	260
Total Past Due	3,567	4,393	2,494
Current	109,776	112,832	134,003
Total Loans	113,343	117,225	136,497
Covered Loans [Member] | Consumer Residential Mortgages Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	9,849	10,005	11,995
60 to 89 Days Past Due	724	442	2,197
Equal to Greater than 90 Days Past Due	6,509	7,763	14,532
Total Past Due	17,082	18,210	28,724
Current	41,545	43,330	41,297
Total Loans	$ 58,627	$ 61,540	$ 70,021