Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Before Tax Amount
Income (loss) before tax amount		$ 22,592	$ 20,936	$ 48,148	$ 47,017
Net unrealized gains (losses) on available-for-sale investment securities, before tax amount
Net unrealized holding gains (losses) arising during the period		148	(3,182)	(2,841)	2,211
(Reversal of provision) provision for credit losses		(36)	105	50	397
Other comprehensive income (loss), securities, available-for-sale, adjustment, before tax		112	(3,077)	(2,791)	2,608
Net unrealized gains (losses) on interest rate swaps used in cash flow hedges, before tax amount
Net unrealized holding losses arising during the period		(1,064)	(5,481)	(5,077)	(4,175)
Less: reclassification adjustment for net losses realized in net income	[1]	1,586	1,371	3,172	2,431
Total net unrealized gains (losses) on interest rate swaps used in cash flow hedges		522	(4,110)	(1,905)	(1,744)
Defined benefit pension plans, Before Tax Amount
Amortization of net actuarial loss included in net periodic pension costs	[2]	147	246	294	492
Total defined benefit pension plans		147	246	294	492
Other comprehensive income (loss), before tax amount		781	(6,941)	(4,402)	1,356
Total comprehensive income (loss), before tax amount		23,373	13,995	43,746	48,373
Tax Expense (Benefit)
Income tax expense		4,485	4,136	9,736	9,183
Net unrealized gains (losses) on available-for-sale investment securities, tax expense (benefit)
Other comprehensive income (loss), securities, available-for-sale, unrealized holding gain (loss) arising during period, tax		32	(668)	(596)	465
(Reversal of provision) provision for credit losses, tax		(8)	22	10	83
Total net unrealized gains (losses) on available-for-sale investment securities		24	(646)	(586)	548
Net unrealized gains (losses) on interest rate swaps used in cash flow hedges, tax expense (benefit)
Net unrealized holding losses arising during the period		(223)	(1,151)	(1,066)	(877)
Less: reclassification adjustment for net losses realized in net income	[1]	333	288	666	511
Total net unrealized gains (losses) on interest rate swaps used in cash flow hedges		110	(863)	(400)	(366)
Defined benefit pension plans, tax expense (benefit)
Amortization of net actuarial loss included in net periodic pension costs	[2]	31	52	62	104
Other comprehensive (income) loss, defined benefit plan, after reclassification adjustment, tax		31	52	62	104
Other comprehensive income (loss), tax expense (benefit)		165	(1,457)	(924)	286
Total comprehensive income (loss), tax expense (benefit)		4,650	2,679	8,812	9,469
Net of Tax Amount
Net income		18,107	16,800	38,412	37,834
Net unrealized gains (losses) on available-for-sale investment securities, net of tax amount
Net unrealized holding gains (losses) arising during the period		116	(2,514)	(2,245)	1,746
(Reversal of provision) provision for credit losses		28	(83)	(40)	(314)
Other comprehensive income (loss), securities, available-for-sale, adjustment, after tax		88	(2,431)	(2,205)	2,060
Net unrealized gains (losses) on interest rate swaps used in cash flow hedges, net of tax amount
Net unrealized holding losses arising during the period		(841)	(4,330)	(4,011)	(3,298)
Less: reclassification adjustment for net losses realized in net income	[1]	1,253	1,083	2,506	1,920
Total net unrealized gains (losses) on interest rate swaps used in cash flow hedges		412	(3,247)	(1,505)	(1,378)
Defined benefit pension plans, net of tax amount
Amortization of net actuarial loss included in net periodic pension costs	[2]	116	194	232	388
Other comprehensive (income) loss, defined benefit plan, after reclassification adjustment, after tax		116	194	232	388
Other comprehensive income (loss), net of tax amount		616	(5,484)	(3,478)	1,070
Total comprehensive income (loss), net of tax amount		$ 18,723	$ 11,316	$ 34,934	$ 38,904

[1] (1) Included in interest expense on demand deposits on the condensed consolidated statements of income (before tax amount).

[2] (2) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (before tax amount). See Note 8, "Retirement Plans and Other Postretirement Benefits" for additional details.