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Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Realized loss on sale of securities $ 0 $ 1,042
Interest income from securities 0  
Payments and proceeds received on securities 0 (70,033)
Commercial Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Realized loss on sale of securities   1,000
Interest income from securities   6,054
Held-to-maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Interest income from securities   2,800
Fair Value Option [Member] | Commercial Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Interest income from securities   $ 3,300
Restatement Adjustment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Payments and proceeds received on securities 69,200  
Principal payments received on securities, CMBS (Held-to-Maturity) 800  
Principal payments received on CMBS (Fair Value Option) $ 30