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Income Taxes Qualified Affordable Housing Projects and Other Tax Credit Investments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Affordable housing tax credit investments, net $ 170,401 $ 191,771 $ 169,382
Other tax credit investments, net 72,584 79,753 89,881
Total tax credit investments, net 242,985 271,524 259,263
Other tax credit liabilities 23,196 68,848 40,634
Other tax credit liabilities 59,823 62,049 69,132
Total unfunded tax credit commitments and liabilities 83,019 130,897 109,766
Affordable housing tax credits and other tax benefits (30,721) (25,642) (23,571)
Other tax credit investment credits and tax benefits (6,385) (15,791) (8,761)
Amortization of affordable housing investments, net of tax benefit 21,569 16,958 15,574
Deferred tax expense 1,341 6,201 2,177
Total reduction in income tax expense (14,196) (18,274) (14,581)
Affordable housing tax credits investment 3,355 0 0
Other tax credit investment amortization 8,094 11,028 0
Total amortization of tax credit investments recorded in non-interest expense $ 11,449 $ 11,028 $ 0