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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value $ 305,210 $ 289,095
Less than 12 months, unrealized losses 2,210 4,492
12 months or more, fair value 12,918 16,436
12 months or more, unrealized losses 451 813
Total, fair value 318,128 305,531
Total, unrealized losses 2,661 5,305
Obligations of U.S. Government-sponsored enterprises    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 10,142  
Less than 12 months, unrealized losses 6  
12 months or more, fair value 0  
12 months or more, unrealized losses 0  
Total, fair value 10,142  
Total, unrealized losses 6  
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 1,642 21,361
Less than 12 months, unrealized losses 7 408
12 months or more, fair value 0 3,553
12 months or more, unrealized losses 0 320
Total, fair value 1,642 24,914
Total, unrealized losses 7 728
Agency mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 293,426 267,734
Less than 12 months, unrealized losses 2,197 4,084
12 months or more, fair value 12,918 12,883
12 months or more, unrealized losses 451 493
Total, fair value 306,344 280,617
Total, unrealized losses $ 2,648 $ 4,577