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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Summary of the components of accumulated other comprehensive income | The following table provides a roll-forward of the changes in AOCI by component for the years ended December 31, 2019, 2020 and 2021 (net of tax):
| Unrealized Gains (Losses) on AFS Securities |  | Unrealized Gains (Losses) on Derivative Instruments |  | Change in Unrecognized Pension Cost on Defined Benefit Pension Plan |  | Total
Balance, January 1, 2019 | $ | (5,200) |  |  | $ | 256 |  |  | $ | (2,741) |  |  | $ | (7,685) |
OCI before reclassifications | 12,276 |  |  | (256) |  |  | (210) |  |  | 11,810 |
Amounts reclassified from AOCI | (6) |  |  | — |  |  | 268 |  |  | 262 |
Subtotal | 12,270 |  |  | (256) |  |  | 58 |  |  | 12,072 |
Tax effect | (2,458) |  |  | 54 |  |  | (12) |  |  | (2,416) |
OCI, net of tax | 9,812 |  |  | (202) |  |  | 46 |  |  | 9,656 |
Balance, December 31, 2019 | 4,612 |  |  | 54 |  |  | (2,695) |  |  | 1,971 |
OCI before reclassifications | 7,474 |  |  | (121) |  |  | (238) |  |  | 7,115 |
Amounts reclassified from AOCI | (71) |  |  | — |  |  | 176 |  |  | 105 |
Subtotal | 7,403 |  |  | (121) |  |  | (62) |  |  | 7,220 |
Tax effect | (1,530) |  |  | 25 |  |  | 12 |  |  | (1,493) |
OCI, net of tax | 5,873 |  |  | (96) |  |  | (50) |  |  | 5,727 |
Balance, December 31, 2020 | 10,485 |  |  | (42) |  |  | (2,745) |  |  | 7,698 |
OCI before reclassifications | (8,371) |  |  | 53 |  |  | 955 |  |  | (7,363) |
Amounts reclassified from AOCI | — |  |  | — |  |  | (31) |  |  | (31) |
Subtotal | (8,371) |  |  | 53 |  |  | 924 |  |  | (7,394) |
Tax effect | 1,759 |  |  | (11) |  |  | (193) |  |  | 1,555 |
OCI, net of tax | (6,612) |  |  | 42 |  |  | 731 |  |  | (5,839) |
Balance, December 31, 2021 | $ | 3,873 |  |  | $ | — |  |  | $ | (2,014) |  |  | $ | 1,859 |
A summary of the components of unrealized gains on AFS securities included in OCI follows for the years ended December 31:
| 2021 |  | 2020 |  | 2019
| Auction Rate Money Market Preferred Stocks |  | All Other AFS Securities |  | Total |  | Auction Rate Money Market Preferred Stocks |  | All Other AFS Securities |  | Total |  | Auction Rate Money Market Preferred Stocks |  | All Other AFS Securities |  | Total
Unrealized gains (losses) arising during the period | $ | 5 |  |  | $ | (8,376) |  |  | $ | (8,371) |  |  | $ | 118 |  |  | $ | 7,356 |  |  | $ | 7,474 |  |  | $ | 565 |  |  | $ | 11,711 |  |  | $ | 12,276 |
Reclassification adjustment for net (gains) losses included in net income | — |  |  | — |  |  | — |  |  | — |  |  | (71) |  |  | (71) |  |  | — |  |  | (6) |  |  | (6) |
Net unrealized gains (losses) | 5 |  |  | (8,376) |  |  | (8,371) |  |  | 118 |  |  | 7,285 |  |  | 7,403 |  |  | 565 |  |  | 11,705 |  |  | 12,270 |
Tax effect | — |  |  | 1,759 |  |  | 1,759 |  |  | — |  |  | (1,530) |  |  | (1,530) |  |  | — |  |  | (2,458) |  |  | (2,458) |
Unrealized gains (losses), net of tax | $ | 5 |  |  | $ | (6,617) |  |  | $ | (6,612) |  |  | $ | 118 |  |  | $ | 5,755 |  |  | $ | 5,873 |  |  | $ | 565 |  |  | $ | 9,247 |  |  | $ | 9,812 |
Details about accumulated other comprehensive income components | The following table details reclassification adjustments and the related affected line items in our consolidated statements of income for the years ended December 31:
Details about AOCI components | Amount Reclassified from AOCI |  | Affected Line Item in the Consolidated Statements of Income
| 2021 |  | 2020 |  | 2019 |  |
Unrealized gains (losses) on AFS securities |  |  |  |  |  |  |
| $ | — |  |  | $ | 71 |  |  | $ | 6 |  |  | Net gains on sale of AFS securities
| — |  |  | 15 |  |  | 1 |  |  | Federal income tax expense
| $ | — |  |  | $ | 56 |  |  | $ | 5 |  |  | Net income
Change in unrecognized pension cost on defined benefit pension plan |  |  |  |  |  |  |
| $ | (31) |  |  | $ | 176 |  |  | $ | 268 |  |  | Other noninterest expenses
| (7) |  |  | 37 |  |  | 56 |  |  | Federal income tax (benefit) expense
| $ | (24) |  |  | $ | 139 |  |  | $ | 212 |  |  | Net income

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