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Accumulated Other Comprehensive Income
3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income
The following table presents changes in OCI:
Before-Tax AmountTax EffectNet of Tax Amount
Three months ended March 31, 2021(in thousands)
Unrealized loss on securities$(51,751)$11,753 $(39,999)
Reclassification adjustment for securities gains included in net income (1)
487 (110)377 
Amortization of net unrealized losses on AFS securities transferred to HTM (2)
2,312 (525)1,787 
Net unrealized loss on interest rate swaps used in cash flow hedges (3)
(2,209)502 (1,707)
Amortization of net unrecognized pension and postretirement items (4)
370 (81)289 
Total OCI$(50,791)$11,538 $(39,253)
Three months ended March 31, 2020
Unrealized gain on securities$22,380 $(4,949)$17,431 
Reclassification adjustment for securities gains included in net income (1)
(46)10 (36)
Amortization of net unrealized losses on AFS securities transferred to HTM (2)
1,022 (227)795 
Amortization of net unrecognized pension and postretirement items (4)
328 (73)255 
Total OCI$23,684 $(5,239)$18,445 

(1)    Amounts reclassified out of AOCI. Before-tax amounts included in "Investment securities gains, net" on the Consolidated Statements of Income. See Note 3, "Investment Securities," for additional details.
(2)    Amounts reclassified out of AOCI. Before-tax amounts included as a reduction to "Interest Income" on the Consolidated Statements of Income.
(3)    Amounts reclassified out of AOCI. Before-tax amounts included in "Interest Income" on the Consolidated Statements of Income.
(4)    Amounts reclassified out of AOCI. Before-tax amounts included in "Salaries and employee benefits" on the Consolidated Statements of Income. See Note 12, "Employee Benefit Plans," for additional details.

The following table presents changes in each component of accumulated other comprehensive income (loss), net of tax:
Unrealized Gains (Losses) on Investment SecuritiesNet Unrealized (Loss) on Interest Rate Swaps used in Cash Flow HedgesUnrecognized Pension and Postretirement Plan Income (Costs)Total
(in thousands)
Three months ended March 31, 2021
Balance at December 31, 2020$81,604 $ $(16,513)$65,091 
OCI before reclassifications(39,999)  (39,999)
Amounts reclassified from AOCI377 (1,707)289 (1,042)
Amortization of net unrealized losses on AFS securities transferred to HTM
1,787   1,787 
Balance at March 31, 2021$43,769 $(1,707)$(16,224)$25,838 
Three months ended March 31, 2020
Balance at December 31, 2019$14,864 $— $(15,001)$(137)
OCI before reclassifications17,431 — — 17,431 
Amounts reclassified from AOCI(36)— 255 219 
Amortization of net unrealized losses on AFS securities transferred to HTM795 — — 795 
Balance at March 31, 2020$33,054 $— $(14,746)$18,308