Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$ 37,401	$ 32,024
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves	912	875
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	7,391	7,709
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	19,370	17,438
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	60	103
Deferred Tax Assets, Capital Loss Carryforwards	458	469
Deferred Tax Assets, Investments	274	414
Deferred Tax Assets, Deferred Income	1,978	1,765
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross	748	165
Deferred Tax Assets, Property, Plant and Equipment	0	688
Deferred Tax Assets, Other	1,589	1,149
Deferred Tax Assets, Gross	70,181	62,799
Deferred Tax Assets, Valuation Allowance	458	298
Deferred Tax Assets, Net of Valuation Allowance	69,723	62,501
Deferred Tax Liabilities, Tax Deferred Income	4,035	5,572
Deferred Tax Liabilities, Goodwill and Intangible Assets	11,894	7,989
Deferred Tax Liabilities, Property, Plant and Equipment	62	0
Deferred Tax Liabilities, Other	2,033	1,364
Deferred Tax Liabilities, Gross	18,024	14,925
Deferred Tax Assets, Net	$ 51,699	$ 47,576