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Other Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Overnight FHLB advances $ 503,815 $ 272,199
Term FHLB advances 365,000 250,576
Other 16,000 13,510
Total other borrowings $ 884,815 $ 536,285