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Investment Securities - Gross unrealized losses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investment securities available-for-sale
Unrealized losses less than 12 months	$ (7,416)	$ (532)
Fair value less than 12 months	340,254	89,457
Unrealized losses over 12 months	(74)	(13)
Fair value over 12 months	9,059	3,667
Total Unrealized losses	(7,490)	(545)
Total Fair value	349,313	93,124
Held-to-maturity investment securities
Unrealized losses less than 12 months	(631)
Fair value less than 12 months	102,695
Total Unrealized losses	(631)
Total Fair value	102,695
Unrealized losses less than 12 months	(8,047)
Fair value less than 12 months	442,949
Unrealized losses over 12 months	(74)
Fair value over 12 months	9,059
Total Unrealized losses	(8,121)
Total Fair value	452,008
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	(29)
Fair value less than 12 months	22,550
Total Unrealized losses	(29)
Total Fair value	22,550
Mortgage backed securities - Residential agency
Investment securities available-for-sale
Unrealized losses less than 12 months	(7,416)	(432)
Fair value less than 12 months	340,254	68,494
Unrealized losses over 12 months	(74)	(4)
Fair value over 12 months	9,057	2,356
Total Unrealized losses	(7,490)	(436)
Total Fair value	349,311	70,850
Held-to-maturity investment securities
Unrealized losses less than 12 months	(602)
Fair value less than 12 months	80,145
Unrealized losses over 12 months	(602)
Total Fair value	80,145
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		(90)
Fair value less than 12 months		16,454
Total Unrealized losses		(90)
Total Fair value		$ 16,454

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