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Other Comprehensive Income (Tables)
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Components of Other Comprehensive Income and Related Tax Effects
Other comprehensive income components and related tax effects were as follows for the years ended December 31, 2021, 2020, and 2019: 
December 31, 2021December 31, 2020December 31, 2019
Unrealized holding gains (losses) on available for sale securities$(19,526)$12,494 $13,732 
Less reclassification adjustment for gains recognized in earnings(783)(2,190)(148)
Net unrealized gains (losses)(20,309)10,304 13,584 
Tax effect4,265 (2,164)(2,852)
Net-of-tax amount(16,044)8,140 10,732 
Actuarial gain (loss) on postemployment health care plan391 277 518 
Net amortization of transition obligation and actuarial gain(43)23 
Net unrealized gain (loss) on postemployment health care plan348 277 541 
Tax effect(73)(58)(113)
Net-of-tax amount275 219 428 
Unrealized gain (loss) on interest rate swap105 (508)(347)
Less reclassification adjustment for losses recognized in earnings276 224 63 
Net unrealized gain (loss)381 (284)(284)
Tax effect(80)60 59 
Net-of-tax amount301 (224)(225)
Other comprehensive income (loss)$(15,468)$8,135 $10,935 
Summary of Change in Accumulated Other Comprehensive Income (Loss)
The following is a summary of the change in the accumulated other comprehensive income (loss) balance, net of tax, for the years ended December 31, 2021, 2020, and 2019. 
Balance
12/31/20
Comprehensive
Income (Loss)
Balance
12/31/21
Unrealized gains (losses) on securities available for sale$15,338 $(16,044)$(706)
Unrealized gain on postretirement benefits plan343 275 618 
Unrealized loss on interest rate swap(607)301 (306)
Total$15,074 $(15,468)$(394)

Balance
12/31/19
Comprehensive
Income (Loss)
Balance
12/31/20
Unrealized gains on securities available for sale$7,198 $8,140 $15,338 
Unrealized gain on postretirement benefits plan124 219 343 
Unrealized loss on interest rate swap(383)(224)(607)
Total$6,939 $8,135 $15,074 
 
Balance
1/1/19
Comprehensive
Income (Loss)
Balance
12/31/19
Unrealized gains (losses) on securities available for sale$(3,534)$10,732 $7,198 
Unrealized gain (loss) on postretirement benefits plan(304)428 124 
Unrealized loss on interest rate swap(158)(225)(383)
Total$(3,996)$10,935 $6,939