Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Investments in Tax Credit and Other Investments, Net [Line Items]
Investments in tax credit and other investments, net	$ 203,758		$ 203,758		$ 173,280
Noninterest expense — amortization of tax credit and other investments	23,827	$ 32,618	66,059	$ 60,779
Accrued Expenses and Other Liabilities
Investments in Tax Credit and Other Investments, Net [Line Items]
Total unfunded commitments for investments in tax credit and other investments	$ 103,000		$ 103,000		$ 117,000