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Investment Securities - Gross unrealized losses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Investment securities available-for-sale
Unrealized losses less than 12 months	$ (6,286)	$ (532)
Fair value less than 12 months	332,320	89,457
Unrealized losses over 12 months		(13)
Fair value over 12 months	2	3,667
Total Unrealized losses	(6,286)	(545)
Total Fair value	332,322	93,124
Held-to-maturity investment securities
Unrealized losses less than 12 months	(5)
Fair value less than 12 months	5,996
Total Unrealized losses	(5)
Total Fair value	5,996
Unrealized losses less than 12 months	(6,291)
Fair value less than 12 months	338,316
Fair value over 12 months	2
Total Unrealized losses	(6,291)
Total Fair value	338,318
U. S. Treasury and agencies
Investment securities available-for-sale
Unrealized losses less than 12 months		(10)
Fair value less than 12 months		4,509
Unrealized losses over 12 months		(9)
Fair value over 12 months		1,309
Total Unrealized losses		(19)
Total Fair value		5,818
Obligations of state and political agencies
Held-to-maturity investment securities
Unrealized losses less than 12 months	(5)
Fair value less than 12 months	5,996
Total Unrealized losses	(5)
Total Fair value	5,996
Mortgage backed securities - Residential agency
Investment securities available-for-sale
Unrealized losses less than 12 months	(6,022)	(432)
Fair value less than 12 months	322,584	68,494
Unrealized losses over 12 months		(4)
Fair value over 12 months		2,356
Total Unrealized losses	(6,022)	(436)
Total Fair value	322,584	70,850
Asset backed securities
Investment securities available-for-sale
Fair value over 12 months	2	2
Total Fair value	2	2
Corporate bonds
Investment securities available-for-sale
Unrealized losses less than 12 months	(264)	(90)
Fair value less than 12 months	9,736	16,454
Total Unrealized losses	(264)	(90)
Total Fair value	$ 9,736	$ 16,454

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