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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value $ 110,081 $ 572,915
Less than 12 months, unrealized losses (2,548) (6,953)
12 months or more, fair value 492,727 12,229
12 months or more, unrealized losses (12,610) (589)
Total, fair value 602,808 585,144
Total, unrealized losses (15,158) (7,542)
Obligations of U.S. Government-sponsored enterprises    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 19,622  
Less than 12 months, unrealized losses 322  
12 months or more, fair value 78,876  
12 months or more, unrealized losses 1,106  
Total, fair value 98,498  
Total, unrealized losses 1,428  
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 3,102 13,951
Less than 12 months, unrealized losses 15 259
12 months or more, fair value 14,156 0
12 months or more, unrealized losses 182 0
Total, fair value 17,258 13,951
Total, unrealized losses 197 259
Agency mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 87,357 469,655
Less than 12 months, unrealized losses 2,211 6,034
12 months or more, fair value 389,770 12,229
12 months or more, unrealized losses 11,285 589
Total, fair value 477,127 481,884
Total, unrealized losses 13,496 $ 6,623
US Treasury Bill Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 0  
Less than 12 months, unrealized losses 0  
12 months or more, fair value 9,925  
12 months or more, unrealized losses 37  
Total, fair value 9,925  
Total, unrealized losses $ 37