Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$ 35,471	$ 37,401
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves	74	912
Deferred Tax Assets, Tax Deferred Expense, Interest on Non Accrual Loans	548	833
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	6,079	7,391
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	19,801	19,370
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	0	60
Deferred Tax Assets, Capital Loss Carryforwards	0	458
Deferred Tax Assets, Investments	185	274
Deferred Tax Assets, Deferred Income	1,868	1,978
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross	8,264	748
Deferred Tax Assets, Other	720	756
Deferred Tax Assets, Gross	73,010	70,181
Deferred Tax Assets, Valuation Allowance	0	458
Deferred Tax Assets, Net of Valuation Allowance	73,010	69,723
Deferred Tax Liabilities, Tax Deferred Income	2,692	4,035
Deferred Tax Liabilities, Goodwill and Intangible Assets	12,929	11,894
Deferred Tax Liabilities, Property, Plant and Equipment	67	62
Deferred Tax Liabilities, Prepaid Expenses	611	580
Deferred Tax Liabilities, Other	1,251	1,453
Deferred Tax Liabilities, Gross	17,550	18,024
Deferred Tax Assets, Net	$ 55,460	$ 51,699