Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Investments in Tax Credit and Other Investments, Net [Line Items]
Investments in tax credit and other investments, net	$ 189,405		$ 189,405		$ 173,280
Noninterest expense — amortization of tax credit and other investments	27,872	$ 14,006	42,232	$ 28,161
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	$ 110,900		$ 110,900		$ 117,000