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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2023
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, 2021, 2022 and 2023 (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, 2021 | $ | 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 |
OCI before reclassifications | (50,015) |  |  | — |  |  | 762 |  |  | (49,253) |
Amounts reclassified from AOCI | — |  |  | — |  |  | 59 |  |  | 59 |
Subtotal | (50,015) |  |  | — |  |  | 821 |  |  | (49,194) |
Tax effect | 10,314 |  |  | — |  |  | (173) |  |  | 10,141 |
OCI, net of tax | (39,701) |  |  | — |  |  | 648 |  |  | (39,053) |
Balance, December 31, 2022 | (35,828) |  |  | — |  |  | (1,366) |  |  | (37,194) |
OCI before reclassifications | 13,365 |  |  | — |  |  | 752 |  |  | 14,117 |
Amounts reclassified from AOCI | (67) |  |  | — |  |  | 95 |  |  | 28 |
Subtotal | 13,298 |  |  | — |  |  | 847 |  |  | 14,145 |
Tax effect | (2,669) |  |  | — |  |  | (178) |  |  | (2,847) |
OCI, net of tax | 10,629 |  |  | — |  |  | 669 |  |  | 11,298 |
Balance, December 31, 2023 | $ | (25,199) |  |  | $ | — |  |  | $ | (697) |  |  | $ | (25,896) |
A summary of the components of unrealized gains on AFS securities included in OCI follows for the years ended December 31:
| 2023 |  | 2022 |  | 2021
| 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 | $ | 589 |  |  | $ | 12,776 |  |  | $ | 13,365 |  |  | $ | (900) |  |  | $ | (49,115) |  |  | $ | (50,015) |  |  | $ | 5 |  |  | $ | (8,376) |  |  | $ | (8,371) |
Reclassification adjustment for net (gains) losses included in net income | — |  |  | (67) |  |  | (67) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net unrealized gains (losses) | 589 |  |  | 12,709 |  |  | 13,298 |  |  | (900) |  |  | (49,115) |  |  | (50,015) |  |  | 5 |  |  | (8,376) |  |  | (8,371) |
Tax effect | — |  |  | (2,669) |  |  | (2,669) |  |  | — |  |  | 10,314 |  |  | 10,314 |  |  | — |  |  | 1,759 |  |  | 1,759 |
Unrealized gains (losses), net of tax | $ | 589 |  |  | $ | 10,040 |  |  | $ | 10,629 |  |  | $ | (900) |  |  | $ | (38,801) |  |  | $ | (39,701) |  |  | $ | 5 |  |  | $ | (6,617) |  |  | $ | (6,612) |
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
| 2023 |  | 2022 |  | 2021 |  |
Unrealized gains (losses) on AFS securities |  |  |  |  |  |  |
| $ | 67 |  |  | $ | — |  |  | $ | — |  |  | Net gains on sale of AFS securities
| 14 |  |  | — |  |  | — |  |  | Federal income tax expense
| $ | 53 |  |  | $ | — |  |  | $ | — |  |  | Net income
Change in unrecognized pension cost on defined benefit pension plan |  |  |  |  |  |  |
| $ | 95 |  |  | $ | 59 |  |  | $ | (31) |  |  | Other noninterest expenses
| 20 |  |  | 12 |  |  | (7) |  |  | Federal income tax (benefit) expense
| $ | 75 |  |  | $ | 47 |  |  | $ | (24) |  |  | Net income

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