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Investment Securities - Gross unrealized losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investment securities available-for-sale
Unrealized losses less than 12 months	$ (12,143)	$ (532)
Fair value less than 12 months	454,526	89,457
Unrealized losses over 12 months	(21)	(13)
Fair value over 12 months	5,652	3,667
Total Unrealized losses	(12,164)	(545)
Total Fair value	460,178	93,124
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	(21)	(9)
Fair value over 12 months	5,650	1,309
Total Unrealized losses	(21)	(19)
Total Fair value	5,650	5,818
Obligations of state and political agencies
Investment securities available-for-sale
Unrealized losses less than 12 months	(1,445)
Fair value less than 12 months	51,463
Total Unrealized losses	(1,445)
Total Fair value	51,463
Mortgage backed securities - Residential agency
Investment securities available-for-sale
Unrealized losses less than 12 months	(10,268)	(432)
Fair value less than 12 months	380,454	68,494
Unrealized losses over 12 months		(4)
Fair value over 12 months		2,356
Total Unrealized losses	(10,268)	(436)
Total Fair value	380,454	70,850
Mortgage backed securities - Commercial
Investment securities available-for-sale
Unrealized losses less than 12 months	(13)
Fair value less than 12 months	9,026
Total Unrealized losses	(13)
Total Fair value	9,026
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	(417)	(90)
Fair value less than 12 months	13,583	16,454
Total Unrealized losses	(417)	(90)
Total Fair value	$ 13,583	$ 16,454

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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