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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value $ 6,654 $ 191,428
Less than 12 months, unrealized losses 11 2,062
12 months or more, fair value 16,945 30,415
12 months or more, unrealized losses 602 1,117
Total, fair value 23,599 221,843
Total, unrealized losses 613 3,179
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 0 2,199
Less than 12 months, unrealized losses 0 12
12 months or more, fair value 3,566 9,395
12 months or more, unrealized losses 309 380
Total, fair value 3,566 11,594
Total, unrealized losses 309 392
Agency mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 6,654 189,229
Less than 12 months, unrealized losses 11 2,050
12 months or more, fair value 13,379 21,020
12 months or more, unrealized losses 293 737
Total, fair value 20,033 210,249
Total, unrealized losses $ 304 $ 2,787