Investment Securities - Securities with unrealized and unrecognized losses (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investment securities
Fair Value, Less than 12 Months	$ 347,791	$ 210,546
Fair Value, 12 Months or More	174,206	49,642
Fair Value, Total	521,997	260,188
Unrealized Losses, Less than 12 Months	(40,480)	(3,680)
Unrealized Losses, 12 Months or More	(36,212)	(1,828)
Unrealized Losses, Total	(76,692)	(5,508)
U.S. government agencies
Investment securities
Fair Value, Less than 12 Months	58,924	10,337
Fair Value, 12 Months or More	32,962	32,210
Fair Value, Total	91,886	42,547
Unrealized Losses, Less than 12 Months	(4,207)	(121)
Unrealized Losses, 12 Months or More	(6,260)	(1,209)
Unrealized Losses, Total	(10,467)	(1,330)
Mortgage-backed securities
Investment securities
Fair Value, Less than 12 Months	196,565	177,506
Fair Value, 12 Months or More	121,896	14,134
Fair Value, Total	318,461	191,640
Unrealized Losses, Less than 12 Months	(20,462)	(3,273)
Unrealized Losses, 12 Months or More	(25,585)	(511)
Unrealized Losses, Total	(46,047)	(3,784)
Corporate Bonds
Investment securities
Fair Value, Less than 12 Months	14,203	9,354
Fair Value, 12 Months or More	8,363
Fair Value, Total	22,566	9,354
Unrealized Losses, Less than 12 Months	(859)	(148)
Unrealized Losses, 12 Months or More	(1,139)
Unrealized Losses, Total	(1,998)	(148)
Obligations of states and political subdivisions
Investment securities
Fair Value, Less than 12 Months	78,099	13,349
Fair Value, 12 Months or More	10,985	3,298
Fair Value, Total	89,084	16,647
Unrealized Losses, Less than 12 Months	(14,952)	(138)
Unrealized Losses, 12 Months or More	(3,228)	(108)
Unrealized Losses, Total	$ (18,180)	$ (246)