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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 288,125 $ 180,744
Less than 12 Months, Unrealized Losses (6,354) (2,148)
12 Months or More, Fair Value 78,254 74,586
12 Months or More, Unrealized Losses (4,254) (2,195)
Total Fair Value 366,379 255,330
Total Unrealized Losses (10,608) (4,343)
U.S. Treasury securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 32,692  
Less than 12 Months, Unrealized Losses (49)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total Fair Value 32,692  
Total Unrealized Losses (49)  
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 7,103 8,201
Less than 12 Months, Unrealized Losses (125) (47)
12 Months or More, Fair Value 0 6,741
12 Months or More, Unrealized Losses 0 (27)
Total Fair Value 7,103 14,942
Total Unrealized Losses (125) (74)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 46,501 1,627
Less than 12 Months, Unrealized Losses (687) (3)
12 Months or More, Fair Value 3,284 3,357
12 Months or More, Unrealized Losses (141) (87)
Total Fair Value 49,785 4,984
Total Unrealized Losses (828) (90)
U.S. Government agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 144,623 82,604
Less than 12 Months, Unrealized Losses (2,945) (822)
12 Months or More, Fair Value 44,649 64,488
12 Months or More, Unrealized Losses (2,693) (2,081)
Total Fair Value 189,272 147,092
Total Unrealized Losses (5,638) (2,903)
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 57,206 88,312
Less than 12 Months, Unrealized Losses (2,548) (1,276)
12 Months or More, Fair Value 30,321 0
12 Months or More, Unrealized Losses (1,420) 0
Total Fair Value 87,527 88,312
Total Unrealized Losses $ (3,968) $ (1,276)