Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$ 60,349	$ 81,380
Interest on nonaccrual loans	8,519	7,485
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	6,174	3,148
Deferred Tax Assets, Property, Plant and Equipment	3,789	7,395
Deferred tax assets, unrealized losses on other real estate owned	248	5,546
Deferred Tax Assets, State Taxes	3,781	7,187
Deferred Tax Assets, Operating Loss Carryforwards	70,269	57,416
Deferred Tax Assets, Capital Loss Carryforwards	14,264	17,740
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	25,986	43,366
Deferred Tax Assets, Other	4,654	7,207
Deferred Tax Assets, Equity Method Investments	7,549	15,195
Deferred Tax Assets, Goodwill and Intangible Assets	15,641	29,996
Tax Credit Carryforward, Deferred Tax Asset	5,651	16,493
Deferred Tax Assets, Gross	236,081	311,347
Deferred Tax Assets, Valuation Allowance	(94,120)	(100,920)
Deferred Tax Assets, Net of Valuation Allowance	141,961	210,427
Deferred Tax Liabilities, Goodwill and Intangible Assets	21,529	12,792
Deferred Tax Liabilities, Tax Deferred Income	9,735	13,389
Deferred Tax Liabilities, Other Comprehensive Income	15,107	4,118
Deferred Tax Liabilities, Regulatory Assets	744	1,098
Deferred Tax Liabilities, Subordinated Debt	24,518	37,499
Deferred Tax Liabilities, Leasing Arrangements	65,286	41,785
Deferred Tax Assets, Investments	9,207	11,793
Deferred Tax Liabilities, Other	7,303	5,634
Deferred Tax Liabilities, Gross	144,222	116,315
Deferred Tax Liabilities, Net	(2,261)
Deferred Tax Assets, Net	$ 0	$ 94,112