Allowance for Loan and Lease Losses Past Due (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 30 to 59 Days Past Due	$ 43,649	$ 47,932
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 60 to 89 Days Past Due	22,182	36,583
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Equal to Greater than 90 Days Past Due	252,849	316,374
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Total Past Due	318,680	400,889
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Current	6,400,591	4,959,216
Loans and Leases Receivable, Net of Deferred Income and Aquired Credit Impaired	6,719,271	5,360,105
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 30 to 59 Days Past Due	15,379	16,966
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 60 to 89 Days Past Due	8,557	12,673
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Equal to Greater than 90 Days Past Due	65,080	71,658
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Total Past Due	89,016	101,297
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Current	4,076,360	3,487,525
Loans and Leases Receivable, Net of Deferred Income and Aquired Credit Impaired	4,165,376	3,588,822
Government insured pool buyouts [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 30 to 59 Days Past Due	19,764	23,396
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 60 to 89 Days Past Due	10,977	17,909
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Equal to Greater than 90 Days Past Due	150,040	179,908
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Total Past Due	180,781	221,213
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Current	141,777	133,011
Loans and Leases Receivable, Net of Deferred Income and Aquired Credit Impaired	322,558	354,224
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 30 to 59 Days Past Due	273	0
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 60 to 89 Days Past Due	138	32
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Equal to Greater than 90 Days Past Due	4,155	10,751
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Total Past Due	4,566	10,783
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Current	773,208	137,216
Loans and Leases Receivable, Net of Deferred Income and Aquired Credit Impaired	777,774	147,999
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 30 to 59 Days Past Due	3,687	2,117
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 60 to 89 Days Past Due	0	4,450
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Equal to Greater than 90 Days Past Due	28,640	48,611
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Total Past Due	32,327	55,178
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Current	543,437	416,826
Loans and Leases Receivable, Net of Deferred Income and Aquired Credit Impaired	575,764	472,004
Lease financing receivables [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 30 to 59 Days Past Due	3,092	3,394
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 60 to 89 Days Past Due	531	971
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Equal to Greater than 90 Days Past Due	447	962
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Total Past Due	4,070	5,327
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Current	677,135	583,174
Loans and Leases Receivable, Net of Deferred Income and Aquired Credit Impaired	681,205	588,501
Home equity lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 30 to 59 Days Past Due	1,312	1,953
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 60 to 89 Days Past Due	1,894	498
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Equal to Greater than 90 Days Past Due	4,256	4,251
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Total Past Due	7,462	6,702
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Current	181,358	193,410
Loans and Leases Receivable, Net of Deferred Income and Aquired Credit Impaired	188,820	200,112
Consumer and credit card [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 30 to 59 Days Past Due	142	106
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, 60 to 89 Days Past Due	85	50
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Equal to Greater than 90 Days Past Due	231	233
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Total Past Due	458	389
Loans and Leases Held for Investment, Recorded Investment, Recorded Investment, Current	7,316	8,054
Loans and Leases Receivable, Net of Deferred Income and Aquired Credit Impaired	$ 7,774	$ 8,443