Other Comprehensive Income (Loss) - Summary of Accumulated Other Comprehensive Income (Loss) ("AOCI") ("AOCL") (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Available for sale securities, before tax amount
Unrealized holding gains (losses)	$ (3,388)	$ (8,575)	$ (3,039)	$ (25,170)
Interest rate swaps designated as cash flow hedges, before tax amount
Unrealized holding (losses) gains, before tax amount	(536)	(209)	(1,169)	(2,267)
Reclassification adjustment for (losses) income recognized in net income, before tax amount	148	20	437	(985)
Defined benefit retirement plans, before tax amount
Total other comprehensive income (loss)	(3,776)	(8,764)	(3,771)	(28,422)
Available for sale securities, tax (expense) or benefit
Unrealized holding gains (losses)	884	2,173	811	6,404
Interest rate swaps designated as cash flow hedges, tax (expense) or benefit
Unrealized holding (losses) gains, tax (expense) or benefit	149	59	327	634
Reclassification adjustment for (losses) income recognized in net income, tax (expense) or benefit	(41)	(6)	(122)	275
Defined benefit retirement plans, tax (expense) or benefit
Total other comprehensive (loss) income, tax (expense) or benefit	992	2,226	1,016	7,313
Available for sale securities
Unrealized holding gains (losses)	(2,504)	(6,402)	(2,228)	(18,766)
Interest rate swaps designated as cash flow hedges
Unrealized holding (losses) gains, net-of-tax amount	(387)	(150)	(842)	(1,633)
Reclassification adjustment for (losses) income realized in net income	107	14	315	(710)
Defined benefit retirement plans
Other comprehensive income (loss)	$ (2,784)	$ (6,538)	$ (2,755)	$ (21,109)