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Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2024
Equity [Abstract]  
Components of Other Comprehensive Income (Loss)
The following table presents the components of other comprehensive income (loss), both gross and net of tax, for the three and nine months ended September 30, 2024 and 2023 (in thousands):
Three months ended September 30,
20242023
Before
Tax		Tax
Effect		After
Tax		Before
Tax		Tax
Effect		After
Tax
Components of Other Comprehensive Income:
Unrealized gains and losses on available for sale debt securities:
Net unrealized gains (losses) arising during the period$75,987 (22,865)53,122 (42,784)11,560 (31,224)
Reclassification adjustment for losses included in net income— — — — — — 
Total75,987 (22,865)53,122 (42,784)11,560 (31,224)
Unrealized gains and losses on derivatives (cash flow hedges):
Net unrealized (losses) gains arising during the period(4,856)1,461 (3,395)3,223 (871)2,352 
Reclassification adjustment for (gains) included in net income(3,504)1,054 (2,450)(4,700)1,270 (3,430)
Total(8,360)2,515 (5,845)(1,477)399 (1,078)
Amortization related to post-retirement obligations(518)156 (362)(355)94 (261)
Total other comprehensive income (loss) $67,109 (20,194)46,915 (44,616)12,053 (32,563)
Nine months ended September 30,
20242023
Before
Tax		Tax
Effect		After
Tax		Before
Tax		Tax
Effect		After
Tax
Components of Other Comprehensive Income:
Unrealized gains and losses on available for sale debt securities:
Net unrealized gains (losses) arising during the period $79,141 (24,415)54,726 (34,271)9,185 (25,086)
Reclassification adjustment for losses included in net income2,973 (917)2,056 — — — 
Total82,114 (25,332)56,782 (34,271)9,185 (25,086)
Unrealized gains and losses on derivatives (cash flow hedges):
Net unrealized gains arising during the period1,159 (349)810 7,380 (1,995)5,385 
Reclassification adjustment for (gains) included in net income(11,414)3,434 (7,980)(13,043)3,524 (9,519)
Total(10,255)3,085 (7,170)(5,663)1,529 (4,134)
Amortization related to post-retirement obligations(2,212)666 (1,546)(1,067)276 (791)
Total other comprehensive income (loss)$69,647 (21,581)48,066 (41,001)10,990 (30,011)
Components of Accumulated Other Comprehensive (Loss), Net of Tax
The following tables present the changes in the components of accumulated other comprehensive (loss), net of tax, for the three and nine months ended September 30, 2024 and 2023 (in thousands):
Changes in Accumulated Other Comprehensive (Loss) by Component, net of tax
for the three months ended September 30,
20242023
Unrealized
Losses on
Available for Sale Debt Securities		Post- Retirement
Obligations		Unrealized Gains on Derivatives (cash flow hedges)Accumulated
Other
Comprehensive
(Loss)		Unrealized Losses on
 Available for Sale Debt Securities		Post-  Retirement
Obligations		Unrealized Gains on Derivatives (cash flow hedges)Accumulated
Other
Comprehensive (Loss)
Balance as of
June 30,		$(150,829)2,753 8,112 (139,964)(180,476)1,042 16,941 (162,493)
Current - period other comprehensive income (loss)53,122 (362)(5,845)46,915 (31,224)(261)(1,078)(32,563)
Balance as of September 30,$(97,707)2,391 2,267 (93,049)(211,700)781 15,863 (195,056)
Changes in Accumulated Other Comprehensive (Loss) by Component, net of tax
for the nine months ended September 30,
20242023
Unrealized
Losses on
Available for Sale Debt Securities		Post-  Retirement
Obligations		Unrealized Gains on Derivatives (cash flow hedges)Accumulated
Other
Comprehensive
Income (Loss)		Unrealized Losses on
 Available for Sale Debt Securities		Post- Retirement
Obligations		Unrealized Gains on Derivatives (cash flow hedges)Accumulated
Other
Comprehensive Income (Loss)
Balance as of December 31,$(154,489)3,937 9,437 (141,115)(186,614)1,572 19,997 (165,045)
Current - period other comprehensive income (loss)56,782 (1,546)(7,170)48,066 (25,086)(791)(4,134)(30,011)
Balance as of September 30,$(97,707)2,391 2,267 (93,049)(211,700)781 15,863 (195,056)
Reclassifications Out of Accumulated Other Comprehensive (Loss)
The following tables summarize the reclassifications from accumulated other comprehensive (loss) to the consolidated statements of income for the three and nine months ended September 30, 2024 and 2023 (in thousands):
Reclassifications From Accumulated Other Comprehensive
Income ("AOCI")
Amount reclassified from AOCI for the three months ended September 30,Affected line item in the Consolidated
Statement of Income
20242023
Details of AOCI:
Available for sale debt securities:
Realized net losses on the sale of securities available for sale$— — Net loss on securities transactions
— — Income tax expense
$— — Net of tax
Cash flow hedges:
Realized net gains on derivatives$(3,504)(4,700)Interest expense
1,054 1,270 Income tax expense
$(2,450)(3,430)
Post-retirement obligations:
Amortization of actuarial gains$(518)(355)
Compensation and employee benefits (1)
156 94 Income tax expense
$(362)(261)Net of tax
Total reclassifications$(2,812)(3,691)Net of tax
Reclassifications From Accumulated Other Comprehensive
Income
Amount reclassified from AOCI for the nine months ended September 30,Affected line item in the Consolidated
Statement of Income
20242023
Details of AOCI:
Available for sale debt securities:
Realized net losses on the sale of securities available for sale$2,973 — Net loss on securities transactions
(917)— Income tax expense
$2,056 — Net of tax
Cash flow hedges:
Realized net gains on derivatives$(11,414)(13,043)Interest expense
3,434 3,524 Income tax expense
$(7,980)(9,519)
Post-retirement obligations:
Amortization of actuarial gains$(2,212)(1,067)
Compensation and employee benefits (1)
666 276 Income tax expense
$(1,546)(791)Net of tax
Total reclassifications$(7,470)(10,310)Net of tax
(1)     This item is included in the computation of net periodic benefit cost. See Note 8. Components of Net Periodic Benefit Cost.