Deposits - Additional Information (Details) - USD ($) $ in Millions |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Deposits [Abstract] | ||
| Certificates of deposits of $250,000 or more, maturities within one year | $ 174.3 | $ 137.8 |
| Certificates of deposits of $250,000 or more, maturities after one year | 5.2 | 11.4 |
| Certificates of deposits of $250,000 or more, total | 179.5 | 149.2 |
| Certificates of deposit of less than $ 250,000, maturities within one year | 360.4 | 292.5 |
| Certificates of deposit of less than $ 250,000, maturities after one year | 11.0 | 28.5 |
| Certificates of deposit of less than $250,000, total | $ 371.4 | $ 321.0 |