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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 235,197 $ 180,744
Less than 12 Months, Unrealized Losses (6,891) (2,148)
12 Months or More, Fair Value 111,644 74,586
12 Months or More, Unrealized Losses (6,074) (2,195)
Total Fair Value 346,841 255,330
Total Unrealized Losses (12,965) (4,343)
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 16,539 8,201
Less than 12 Months, Unrealized Losses (349) (47)
12 Months or More, Fair Value 5,704 6,741
12 Months or More, Unrealized Losses (136) (27)
Total Fair Value 22,243 14,942
Total Unrealized Losses (485) (74)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 42,967 1,627
Less than 12 Months, Unrealized Losses (1,139) (3)
12 Months or More, Fair Value 3,080 3,357
12 Months or More, Unrealized Losses (152) (87)
Total Fair Value 46,047 4,984
Total Unrealized Losses (1,291) (90)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 130,925 82,604
Less than 12 Months, Unrealized Losses (3,482) (822)
12 Months or More, Fair Value 52,418 64,488
12 Months or More, Unrealized Losses (3,150) (2,081)
Total Fair Value 183,343 147,092
Total Unrealized Losses (6,632) (2,903)
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 44,766 88,312
Less than 12 Months, Unrealized Losses (1,921) (1,276)
12 Months or More, Fair Value 50,442 0
12 Months or More, Unrealized Losses (2,636) 0
Total Fair Value 95,208 88,312
Total Unrealized Losses $ (4,557) $ (1,276)