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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 102,392 $ 118,138
Less than 12 Months, Unrealized Losses (1,010) (972)
12 Months or More, Fair Value 179,432 238,832
12 Months or More, Unrealized Losses (2,657) (8,499)
Total Fair Value 281,824 356,970
Total Unrealized Losses (3,667) (9,471)
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 12,922 14,891
Less than 12 Months, Unrealized Losses (222) (254)
12 Months or More, Fair Value 6,007 6,430
12 Months or More, Unrealized Losses (112) (148)
Total Fair Value 18,929 21,321
Total Unrealized Losses (334) (402)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 0 10,056
Less than 12 Months, Unrealized Losses 0 (99)
12 Months or More, Fair Value 3,163 22,945
12 Months or More, Unrealized Losses (50) (488)
Total Fair Value 3,163 33,001
Total Unrealized Losses (50) (587)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 63,382 61,866
Less than 12 Months, Unrealized Losses (683) (424)
12 Months or More, Fair Value 86,950 124,673
12 Months or More, Unrealized Losses (1,913) (4,287)
Total Fair Value 150,332 186,539
Total Unrealized Losses (2,596) (4,711)
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 26,088 31,325
Less than 12 Months, Unrealized Losses (105) (195)
12 Months or More, Fair Value 83,312 84,784
12 Months or More, Unrealized Losses (582) (3,576)
Total Fair Value 109,400 116,109
Total Unrealized Losses $ (687) $ (3,771)