Annual report pursuant to Section 13 and 15(d)

VIEs - Low Income Housing Tax Credit Partnerships (Details)

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VIEs - Low Income Housing Tax Credit Partnerships (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Low Income Housing Tax Credit Partnerships      
Variable Interest Entity [Line Items]      
Affordable housing tax credit investments $ 877,237 $ 674,157  
Less: amortization (300,357) (248,657)  
Net affordable housing tax credit investments 576,880 425,500  
Unfunded commitments 292,721 196,001  
Tax credits and other tax benefits recognized 79,696 59,614 $ 51,317
Proportional Amortization Method      
Variable Interest Entity [Line Items]      
Tax credit amortization expense included in provision for income taxes 52,713 42,951 39,021
Proportional amortization method      
Tax credit amortization expense included in provision for income taxes 52,713 42,951 39,021
Equity Method      
Equity method      
Tax credit investment losses included in noninterest income $ 637 $ 355 $ 434