CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income		$ 52,909	$ 54,024	$ 31,959
Available for sale securities
Unrealized holding gains (losses)		(18,736)	(4,622)	2,800
Reclassification adjustment for losses realized in net income	[1]			(57)
Total unrealized losses on available for sale securities		(18,736)	(4,622)	2,743
Interest rate swaps designated as cash flow hedges
Unrealized holding gains (losses)		(1,563)	(959)	4,758
Reclassification adjustment for gains (losses) realized in net income	[2]	(600)	(1,864)	(1,354)
Total unrealized losses on interest rate swaps		(2,163)	(2,823)	3,404
Defined benefit retirement plans
Change in retirement liabilities		1,310	3,801	(1,232)
Other comprehensive income (loss)		(19,589)	(3,644)	4,915
Comprehensive income		$ 33,320	$ 50,380	$ 36,874

[1] Reported in gain (loss) on disposition of investment securities line item in the Consolidated Statements of Income.

[2] Reported in interest on payable loans line item in the Consolidated Statements of Income.