Income Taxes (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 132,997	$ 194,156	$ 195,278
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	45,945	33,729	32,896
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	(9,810)	(15,510)	(13,992)
Income Tax Reconciliation Change In Cash Surrender Value Of Life Insurance	(1,742)	(1,853)	(1,544)
Income Tax Credits and Adjustments	(2,025)	(2,054)	(1,439)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount	2,552	1,781	1,257
Nondeductible acquisition-related expense	71	1,608	0
Nondeductible FDIC Insurance Premiums	1,664	0	0
Deferred Tax Assets, Tax Deferred Expense	(169)	1,157	(2,268)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(15,721)	(13,071)	(8,689)
Deferred Tax Asset, Capital Loss Carryforward, Expired	8,097	0	0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	1,859	(1,156)	0
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	4,260	(1,874)	4,271
Income Tax Expense (Benefit), Continuing Operations, Discontinued Operations	$ 167,978	$ 196,913	$ 205,770