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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value $ 540,018 $ 572,915
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12,186 6,953
12 months or more, fair value 121,407 12,229
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 5,302 589
Total, fair value 661,425 585,144
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 17,488 7,542
Obligations of U.S. Government-sponsored enterprises    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 98,192 89,309
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,698  
Securities Available for Sale, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses   660
12 months or more, fair value 0 0
Securities Available for Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Total, fair value 98,192 89,309
Securities Available for Sale Continuous Unrealized Loss Position, Total Aggregate Losses   660
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 1,698  
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 23,766 13,951
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 423 259
12 months or more, fair value 361 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 27 0
Total, fair value 24,127 13,951
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 450 259
Agency mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 408,153 469,655
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 10,017 6,034
12 months or more, fair value 121,046 12,229
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 5,275 589
Total, fair value 529,199 481,884
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 15,292 $ 6,623
US Treasury Bill Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 9,907  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 48  
12 months or more, fair value 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Total, fair value 9,907  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 48