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Shareholders' Equity (Tables)
12 Months Ended
Dec. 31, 2022
Accumulated Other Comprehensive Income [Abstract]  
Schedule of Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)

The following table presents the components of other comprehensive income (loss) for the years ended December 31: 
Before-Tax AmountTax EffectNet of Tax Amount
(dollars in thousands)
2022
Unrealized gain (loss) on securities$(403,606)$91,437 $(312,169)
Reclassification adjustment for securities gains (losses) included in net income(1)
(27)7 (20)
Amortization of net unrealized gains (losses) on AFS transferred to HTM(2)
(57,509)13,026 (44,483)
Net unrealized holding gains (loss) arising during the period on interest rate derivatives used in cash flow hedges(81,400)18,437 (62,963)
Reclassification adjustment for net loss (gain) realized in net income on interest rate derivatives used in cash flow hedges7,761 (1,757)6,004 
Unrecognized pension and postretirement income (cost)825 (181)644 
Amortization of net unrecognized pension and postretirement items(3)
128 (28)100 
Total Other Comprehensive Income (Loss)$(533,828)$120,941 $(412,887)
2021
Unrealized gain (loss) on securities$(23,222)$5,274 $(17,948)
Reclassification adjustment for securities gains (losses) included in net income(1)
(33,516)7,611 (25,905)
Amortization of net unrealized gains (losses) on AFS transferred to HTM(2)
3,485 (795)2,690 
Net unrealized holding gain (loss) arising during the period on interest rate derivatives used in cash flow hedges(3,452)782 (2,670)
Reclassification adjustment for net loss (gain) realized in net income on interest rate derivatives used in cash flow hedges(2,776)629 (2,147)
Unrecognized pension and postretirement income (cost)9,147 (2,003)7,144 
Amortization of net unrecognized pension and postretirement items(3)
1,480 (324)1,156 
Total Other Comprehensive Income (Loss)$(48,854)$11,174 $(37,680)
2020
Unrealized gain (loss) on securities$85,188 $(19,537)$65,651 
Reclassification adjustment for securities gains (losses) included in net income(1)
(3,053)694 (2,359)
Amortization of net unrealized gains (losses) on AFS transferred to HTM(2)(4)
4,360 (912)3,448 
Unrecognized pension and postretirement income (cost)(3,242)710 (2,532)
Amortization of net unrecognized pension and postretirement items(3)
1,311 (291)1,020 
Total Other Comprehensive Income (Loss)$84,564 $(19,336)$65,228 
(1) Amounts reclassified out of AOCI/(loss). Before-tax amounts included in "Investment securities gains, net" on the consolidated statements of income. See "Note 4 - Investment Securities," for additional information.
(2) Amounts reclassified out of AOCI/(loss). Before-tax amounts included as a reduction to "Interest Income" on the consolidated statements of income. See "Note 4, - Investment Securities," for additional information.
(3) Amounts reclassified out of AOCI/(loss). Before-tax amounts included in "Salaries and employee benefits" on the consolidated statements of income. See "Note 17 - Employee Benefit Plans," for additional information.    
(4) Before-Tax amount includes a $3.7 million reclassification of unrealized loss related to the early adoption of ASU 2019-04.
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table presents changes in each component of accumulated other comprehensive income (loss), net of tax, for the years ended December 31: 
Unrealized Gains (Losses) on Investment SecuritiesNet Unrealized (Loss) Gain on Interest Rate Derivatives used in Cash Flow HedgesUnrecognized Pension and Postretirement Plan Income (Costs)Total
(dollars in thousands)
Balance at December 31, 2019$14,864 $— $(15,001)$(137)
Other comprehensive income (loss) before reclassifications65,651 — (2,532)63,119 
Amounts reclassified from AOCI gain (loss)(2,359)— 1,020 (1,339)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM3,448 — — 3,448 
Balance at December 31, 202081,604 — (16,513)65,091 
OCI before reclassifications(17,948)— 7,144 (10,804)
Amounts reclassified from AOCI(25,905)(4,817)1,156 (29,566)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM2,690 — — 2,690 
Balance at December 31, 202140,441 (4,817)(8,213)27,411 
OCI before reclassifications(312,169)(62,963)644 (374,488)
Amounts reclassified from AOCI(20)6,004 100 6,084 
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM(44,483)  (44,483)
Balance at December 31, 2022$(316,231)$(61,776)$(7,469)$(385,476)