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Borrowings - Maturities of FHLB Borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Extinguishment of Debt [Line Items]    
Total $ 703,850 $ 754,290
Contractual Maturities    
Extinguishment of Debt [Line Items]    
Due within one year 220,103  
Due after one year through five years 483,747  
Total 703,850  
Maturity/Put Date    
Extinguishment of Debt [Line Items]    
Due within one year 220,103  
Due after one year through five years 483,747  
Total $ 703,850