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Securities - Securities with Unrealized Losses - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Available-for-sale, Fair Value    
Less Than 12 Months $ 277,201 $ 245,045
Total 277,201 245,045
Available-for-sale, Unrealized Losses    
Less Than 12 Months (3,267) (3,537)
Total (3,267) (3,537)
Agency mortgage-backed securities    
Available-for-sale, Fair Value    
Less Than 12 Months 277,201 245,045
Total 277,201 245,045
Available-for-sale, Unrealized Losses    
Less Than 12 Months (3,267) (3,537)
Total $ (3,267) $ (3,537)