Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Before Tax Amount
Income (loss) before tax amount		$ 23,388	$ 21,269	$ 71,536	$ 68,286
Net unrealized gains (losses) on available-for-sale investment securities, before tax amount
Net unrealized holding gains (losses) arising during the period		11,791	(12,622)	8,950	(10,411)
Reversal of provision for credit losses		(139)	0	(89)	397
Less: reclassification adjustment for net gains on sales realized in net income		(18)	0	(18)	0
Other comprehensive income (loss), securities, available-for-sale, adjustment, before tax		11,634	(12,622)	8,843	(10,014)
Net unrealized gains (losses) on interest rate swaps used in cash flow hedges, before tax amount
Net unrealized holding gains (losses) arising during the period		3,098	(2,541)	(1,979)	(6,716)
Less: reclassification adjustment for net losses realized in net income		575	1,558	3,747	3,989
Reclassification adjustment included in earnings	[1]	370		370
Total net unrealized gains (losses) on interest rate swaps used in cash flow hedges		4,043	(983)	2,138	(2,727)
Defined benefit pension plans, Before Tax Amount
Amortization of net actuarial loss included in net periodic pension costs	[2]	147	247	441	739
Total defined benefit pension plans		147	247	441	739
Other comprehensive income (loss), before tax amount		15,824	(13,358)	11,422	(12,002)
Total comprehensive income (loss), before tax amount		39,212	7,911	82,958	56,284
Tax Expense (Benefit)
Income tax expense		4,810	4,253	14,546	13,436
Net unrealized gains (losses) on interest rate swaps used in cash flow hedges, before tax expense (benefit)
Net unrealized holding gains (losses) arising during the period		2,476	(2,651)	1,880	(2,186)
(Reversal of provision) provision for credit losses		(29)	0	(19)	83
Less: reclassification adjustment for net gains on sales realized in net income		(4)	0	(4)	0
Total net unrealized gains (losses) on available-for-sale investment securities		2,443	(2,651)	1,857	(2,103)
Net unrealized gains (losses) on interest rate swaps used in cash flow hedges, tax expense (benefit)
Net unrealized holding gains (losses) arising during the period		650	(534)	(416)	(1,411)
Less: reclassification adjustment for net losses realized in net income		121	327	787	838
Reclassification adjustment recorded in earnings	[1]	78		78
Total net unrealized gains (losses) on interest rate swaps used in cash flow hedges		849	(207)	449	(573)
Defined benefit pension plans, tax expense (benefit)
Amortization of net actuarial loss included in net periodic pension costs	[2]	31	52	93	156
Other comprehensive (income) loss, defined benefit plan, after reclassification adjustment, tax		31	52	93	156
Other comprehensive income (loss), tax expense (benefit)		3,323	(2,806)	2,399	(2,520)
Total comprehensive income (loss), tax expense (benefit)		8,133	1,447	16,945	10,916
Net of Tax Amount
Net income		18,578	17,016	56,990	54,850
Net unrealized gains (losses) on available-for-sale investment securities, net of tax amount
Net unrealized holding gains (losses) arising during the period		9,315	(9,971)	7,070	(8,225)
Recovery of provision for credit losses, after tax		(110)	0	(70)	314
Less: reclassification adjustment for net gains on sales realized in net income		(14)	0	(14)	0
Other comprehensive income (loss), securities, available-for-sale, adjustment, after tax		9,191	(9,971)	6,986	(7,911)
Net unrealized gains (losses) on interest rate swaps used in cash flow hedges, net of tax amount
Net unrealized holding gains (losses) arising during the period		2,448	(2,007)	(1,563)	(5,305)
Less: reclassification adjustment for net losses realized in net income		454	1,231	2,960	3,151
Reclassification adjustment recorded in earnings	[1]	292		292
Total net unrealized gains (losses) on interest rate swaps used in cash flow hedges		3,194	(776)	1,689	(2,154)
Defined benefit pension plans, net of tax amount
Amortization of net actuarial loss included in net periodic pension costs	[2]	116	195	348	583
Other comprehensive (income) loss, defined benefit plan, after reclassification adjustment, after tax		116	195	348	583
Other comprehensive income (loss), net of tax amount		12,501	(10,552)	9,023	(9,482)
Total comprehensive income (loss), net of tax amount		$ 31,079	$ 6,464	$ 66,013	$ 45,368

[1] (1) Represents reclassification to earnings as a reduction to interest income of amounts included in accumulated other comprehensive income on the condensed consolidated balance sheet related to the interest rate swap terminated on August 2, 2024.

[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.