Quarterly report pursuant to Section 13 or 15(d)

VIEs - Low Income Housing Tax Credit Partnership (Details)

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VIEs - Low Income Housing Tax Credit Partnership (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Low Income Housing Tax Credit Partnerships          
Variable Interest Entity [Line Items]          
Affordable housing tax credit investments $ 980,984   $ 980,984   $ 877,237
Less: amortization (342,813)   (342,813)   (300,357)
Net affordable housing tax credit investments 638,171   638,171   576,880
Unfunded commitments 348,733   348,733   $ 292,721
Tax credits and other tax benefits recognized 22,471 $ 21,200 68,426 $ 57,634  
Proportional Amortization Method          
Variable Interest Entity [Line Items]          
Tax credit amortization expense included in provision for income taxes 17,292 13,608 51,474 38,513  
Equity Method          
Variable Interest Entity [Line Items]          
Tax credit investment (gains) losses included in noninterest income $ 0 $ 132 $ 0 $ 396