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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value $ 332,719 $ 289,095
Less than 12 months, unrealized losses 3,904 4,492
12 months or more, fair value 16,870 16,436
12 months or more, unrealized losses 792 813
Total, fair value 349,589 305,531
Total, unrealized losses 4,696 5,305
Obligations of U.S. Government-sponsored enterprises    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 20,110  
Less than 12 months, unrealized losses 66  
12 months or more, fair value 0  
12 months or more, unrealized losses 0  
Total, fair value 20,110  
Total, unrealized losses 66  
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 14,371 21,361
Less than 12 months, unrealized losses 152 408
12 months or more, fair value 3,559 3,553
12 months or more, unrealized losses 312 320
Total, fair value 17,930 24,914
Total, unrealized losses 464 728
Agency mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 298,238 267,734
Less than 12 months, unrealized losses 3,686 4,084
12 months or more, fair value 13,311 12,883
12 months or more, unrealized losses 480 493
Total, fair value 311,549 280,617
Total, unrealized losses $ 4,166 $ 4,577