Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$ 97,385	$ 100,981
Interest on nonaccrual loans	5,100	7,394
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	4,027	4,585
Deferred Tax Assets, Property, Plant and Equipment	5,867	5,359
Deferred tax assets, unrealized losses on other real estate owned	6,479	7,353
Assets acquired in FDIC-assisted acquisition	2,319	10,217
Deferred Tax Assets, State Taxes	6,101	5,009
Deferred Tax Assets, Operating Loss Carryforwards	125,678	207,575
Deferred Tax Assets, Capital Loss Carryforwards	35,597	57,494
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	40,733	36,115
Deferred Tax Assets, Other	0	6,254
Deferred Tax Assets, Equity Method Investments	16,712	8,666
Deferred Tax Assets, Goodwill and Intangible Assets	37,423	44,372
Tax Credit Carryforward, Deferred Tax Asset	35,874	32,183
Deferred Tax Assets, Gross	419,295	533,557
Deferred Tax Assets, Valuation Allowance	(121,138)	(130,282)
Deferred Tax Assets, Net of Valuation Allowance	298,157	403,275
Deferred Tax Liabilities, Goodwill and Intangible Assets	19,122	3,978
Deferred Tax Liabilities, Tax Deferred Income	16,283	17,594
Deferred Tax Liabilities, Other Comprehensive Income	19,224	17,926
Deferred Tax Liabilities, Regulatory Assets	1,067	2,820
Deferred Tax Liabilities, Subordinated Debt	39,242	40,369
Deferred Tax Liabilities, Leasing Arrangements	40,029	34,136
Unrealized income from FDIC-assisted acquisition	7,543	2,041
Deferred Tax Liabilities, Investments	17,087
Deferred Tax Assets, Investments		0
Deferred Tax Liabilities, Other	12,171	0
Deferred Tax Liabilities, Gross	171,768	118,864
Deferred Tax Assets, Net	$ 126,389	$ 284,411