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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value $ 289,095 $ 191,428
Less than 12 months, unrealized losses (4,492) (2,062)
12 months or more, fair value 16,436 30,415
12 months or more, unrealized losses (813) (1,117)
Total, fair value 305,531 221,843
Total, unrealized losses (5,305) (3,179)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 21,361 2,199
Less than 12 months, unrealized losses 408 12
12 months or more, fair value 3,553 9,395
12 months or more, unrealized losses 320 380
Total, fair value 24,914 11,594
Total, unrealized losses 728 392
Agency mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 267,734 189,229
Less than 12 months, unrealized losses 4,084 2,050
12 months or more, fair value 12,883 21,020
12 months or more, unrealized losses 493 737
Total, fair value 280,617 210,249
Total, unrealized losses $ 4,577 $ 2,787