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
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Low Income Housing Tax Credit Partnerships      
Variable Interest Entity [Line Items]      
Affordable housing tax credit investments $ 870,421   $ 877,237
Less: amortization (310,602)   (300,357)
Net affordable housing tax credit investments 559,819   576,880
Unfunded commitments 279,270   $ 292,721
Tax credits and other tax benefits recognized 23,283 $ 18,285  
Proportional Amortization Method      
Variable Interest Entity [Line Items]      
Tax credit amortization expense included in provision for income taxes 16,961 12,407  
Equity Method      
Variable Interest Entity [Line Items]      
Tax credit investment (gains) losses included in non-interest income $ 109 $ 132