Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Deferred tax assets:
Allowance for credit losses	$ 129,931	$ 44,758
Federal and state carryforwards		27,355
Accrued expenses	68,981	53,894
Non-accrual Interest Income	16,766	8,532
Depreciation		3,975
Basis difference from OREO and loans	15,118	20,512
Unrealized losses on cash flow hedges	607	607
Share-based compensation	26,471	22,056
Basis difference in investments	12,179	20,536
Total gross deferred tax assets	273,963	206,752
Other	3,910	4,527
Deferred tax liabilities:
Core deposit and other intangibles	5,268	6,274
State income taxes	6,625	7,515
Depreciation	2,814
Deferred loan origination costs	6,728	7,073
Prepaid expenses	2,760	1,626
Unrealized gains on securities available-for-sale	53,308	26,808
Leasing activities	20,950	26,506
Basis difference in FHLB Stock	19,755	25,120
Other	226	432
Total gross deferred tax liabilities	118,434	101,354
Net deferred tax assets	$ 155,529	$ 105,398