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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value $ 68,040 $ 110,081
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 790 2,548
12 months or more, fair value 359,064 492,727
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 4,699 12,610
Total, fair value 427,104 602,808
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 5,489 15,158
Obligations of U.S. Government-sponsored enterprises    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 19,854 19,622
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 95 322
12 months or more, fair value 29,796 78,876
Securities Available for Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses   1,106
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 252  
Total, fair value 49,650 98,498
Securities Available for Sale Continuous Unrealized Loss Position, Total Aggregate Losses   1,428
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 347  
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 680 3,102
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 10 15
12 months or more, fair value 2,949 14,156
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 13 182
Total, fair value 3,629 17,258
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 23 197
Agency mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value 47,506 87,357
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 685 2,211
12 months or more, fair value 326,319 389,770
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 4,434 11,285
Total, fair value 373,825 477,127
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 5,119 13,496
US Treasury Bill Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, fair value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
12 months or more, fair value   9,925
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   37
Total, fair value   9,925
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ 37