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Investments - Held-to-Maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]            
Held-to-maturity securities transferred to available-for-sale securities   $ 52,400        
Held-to-maturity securities transferred to available-for-sale securities, unrealized holding gains $ 0 $ 1,800 $ 0 $ 1,825 $ 0  
Amortized cost and fair values of investment securities held-to-maturity            
Amortized Cost 0     0   $ 52,859
Unrealized Gain           1,699
Unrealized Loss           (88)
Fair Value $ 0     $ 0   54,470
Municipal Securities            
Amortized cost and fair values of investment securities held-to-maturity            
Amortized Cost           52,859
Unrealized Gain           1,699
Unrealized Loss           (88)
Fair Value           $ 54,470