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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities
Amortized Cost	$ 469,471
Available-for-sale debt securities	476,211	$ 463,905
Amortized Cost	469,471	470,162
Gross Unrealized Gains	8,849	3,214
Gross Unrealized Losses	(2,109)	(9,471)
Available-for-sale securities	476,211	463,905
U.S. Government agencies
Schedule of Available-for-sale Securities
Amortized Cost	18,167	21,723
Gross Unrealized Gains	17	0
Gross Unrealized Losses	(281)	(402)
Available-for-sale debt securities	17,903	21,321
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	26,577	79,886
Gross Unrealized Gains	2,798	2,205
Gross Unrealized Losses	0	(587)
Available-for-sale debt securities	29,375	81,504
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Amortized Cost	225,045	239,388
Gross Unrealized Gains	1,559	253
Gross Unrealized Losses	(1,663)	(4,711)
Available-for-sale debt securities	224,941	234,930
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Amortized Cost	190,682	129,165
Gross Unrealized Gains	4,296	756
Gross Unrealized Losses	(165)	(3,771)
Available-for-sale debt securities	194,813	$ 126,150
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized Cost	9,000
Gross Unrealized Gains	179
Gross Unrealized Losses	0
Available-for-sale debt securities	$ 9,179

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