Quarterly report pursuant to Section 13 or 15(d)

VIEs - Unconsolidated VIEs (Details)

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VIEs - Unconsolidated VIEs (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Trust 2016 Unconsolidated [Member]    
Variable Interest Entity [Line Items]    
Total Assets $ 8,674 $ 14,770
Total Liabilities 0 0
Maximum Exposure to Loss 8,674 14,770
2015-1 Automobile Trust    
Variable Interest Entity [Line Items]    
Total Assets 1,506 2,227
Total Liabilities 0 0
Maximum Exposure to Loss 1,506 2,227
Trust Preferred Securities    
Variable Interest Entity [Line Items]    
Total Assets 13,919 13,919
Total Liabilities 252,577 252,552
Maximum Exposure to Loss 0 0
Low Income Housing Tax Credit Partnerships    
Variable Interest Entity [Line Items]    
Total Assets 638,171 576,880
Total Liabilities 348,733 292,721
Maximum Exposure to Loss 638,171 576,880
Other Investments    
Variable Interest Entity [Line Items]    
Total Assets 108,556 79,195
Total Liabilities 48,339 42,316
Maximum Exposure to Loss 108,556 79,195
Total    
Variable Interest Entity [Line Items]    
Total Assets 770,826 686,991
Total Liabilities 649,649 587,589
Maximum Exposure to Loss $ 756,907 $ 673,072