Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$ 58,375	$ 60,349
Interest on nonaccrual loans	4,389	8,519
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	6,015	6,174
Deferred Tax Assets, Property, Plant and Equipment	4,506	3,789
Deferred tax assets, unrealized losses on other real estate owned	263	248
Deferred Tax Assets, State Taxes	6,570	3,781
Deferred Tax Assets, Operating Loss Carryforwards	68,026	70,269
Deferred Tax Assets, Capital Loss Carryforwards	4,212	14,264
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	35,750	25,986
Deferred Tax Assets, Other	4,887	0
Unrealized Loss From FDIC Assisted Acquisitions	3,559	4,654
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross	2,435	0
Deferred Tax Assets, Equity Method Investments	4,896	7,549
Deferred Tax Assets, Goodwill and Intangible Assets	10,418	15,641
Tax Credit Carryforward, Deferred Tax Asset	5,237	5,651
Deferred Tax Assets, Gross	219,538	236,081
Deferred Tax Assets, Valuation Allowance	(78,407)	(94,120)
Deferred Tax Assets, Net of Valuation Allowance	141,131	141,961
Deferred Tax Liabilities, Goodwill and Intangible Assets	15,159	21,529
Deferred Tax Liabilities, Tax Deferred Income	7,275	9,735
Deferred Tax Liabilities, Other Comprehensive Income	0	15,107
Deferred Tax Liabilities, Regulatory Assets	658	744
Deferred Tax Liabilities, Subordinated Debt	23,164	24,518
Deferred Tax Liabilities, Leasing Arrangements	75,750	65,286
Deferred Tax Assets, Investments	0	9,207
Deferred Tax Liabilities, Other	0	7,303
Deferred Tax Liabilities, Gross	123,642	144,222
Deferred Tax Asset (Liability)	(17,489)	2,261
Deferred Tax Assets, Net	$ 17,489	$ 0