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Investments - Held-to-Maturity (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Amortized cost and fair values of investment securities held-to-maturity      
Value of held to maturity securities transferred to available for sale securities   $ 52,400  
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax $ 1,825    
Amortized Cost     $ 52,859
Unrealized Gain     1,699
Unrealized Loss     (88)
Securities held-to-maturity, fair value $ 0   54,470
Municipal notes      
Amortized cost and fair values of investment securities held-to-maturity      
Amortized Cost     52,859
Unrealized Gain     1,699
Unrealized Loss     (88)
Securities held-to-maturity, fair value     $ 54,470