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, 2016
Mar. 31, 2015
Dec. 31, 2015
Low Income Housing Tax Credit Partnerships      
Variable Interest Entity [Line Items]      
Affordable housing tax credit investments $ 674,221   $ 674,157
Less: amortization (261,195)   (248,657)
Net affordable housing tax credit investments 413,026   425,500
Unfunded commitments 186,651   $ 196,001
Tax credits and other tax benefits recognized 18,285 $ 15,747  
Proportional Amortization Method      
Variable Interest Entity [Line Items]      
Tax credit amortization expense included in provision for income taxes 12,407 11,074  
Equity Method      
Variable Interest Entity [Line Items]      
Tax credit investment (gains) losses included in non-interest income $ 132 $ 147