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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Summary of the components of accumulated other comprehensive income | The following table summarizes the changes in AOCI by component for the:
| Three Months Ended June 30
| 2021 |  | 2020
| Unrealized Gains (Losses) on AFS Securities |  | Unrealized Gains (Losses) on Derivative Instruments |  | Defined Benefit Pension Plan |  | Total |  | Unrealized Gains (Losses) on AFS Securities |  | Unrealized Gains (Losses) on Derivative Instruments |  | Defined Benefit Pension Plan |  | Total
Balance, April 1 | $ | 7,682 |  |  | $ | (21) |  |  | $ | (2,745) |  |  | $ | 4,916 |  |  | $ | 9,459 |  |  | $ | (54) |  |  | $ | (2,695) |  |  | $ | 6,710 |
OCI before reclassifications | 988 |  |  | 27 |  |  | — |  |  | 1,015 |  |  | 2,059 |  |  | (29) |  |  | — |  |  | 2,030 |
Tax effect | (201) |  |  | (6) |  |  | — |  |  | (207) |  |  | (379) |  |  | 6 |  |  | — |  |  | (373) |
OCI, net of tax | 787 |  |  | 21 |  |  | — |  |  | 808 |  |  | 1,680 |  |  | (23) |  |  | — |  |  | 1,657 |
Balance, June 30 | $ | 8,469 |  |  | $ | — |  |  | $ | (2,745) |  |  | $ | 5,724 |  |  | $ | 11,139 |  |  | $ | (77) |  |  | $ | (2,695) |  |  | $ | 8,367 |
| Six Months Ended June 30
| 2021 |  | 2020
| Unrealized Gains (Losses) on AFS Securities |  | Unrealized Gains (Losses) on Derivative Instruments |  | Defined Benefit Pension Plan |  | Total |  | Unrealized Gains (Losses) on AFS Securities |  | Unrealized Gains (Losses) on Derivative Instruments |  | Defined Benefit Pension Plan |  | Total
Balance, January 1 | $ | 10,485 |  |  | $ | (42) |  |  | $ | (2,745) |  |  | $ | 7,698 |  |  | $ | 4,612 |  |  | $ | 54 |  |  | $ | (2,695) |  |  | $ | 1,971 |
OCI before reclassifications | (2,557) |  |  | 53 |  |  | — |  |  | (2,504) |  |  | 8,370 |  |  | (165) |  |  | — |  |  | 8,205 |
Amounts reclassified from AOCI | — |  |  | — |  |  | — |  |  | — |  |  | (71) |  |  | — |  |  | — |  |  | (71) |
Subtotal | (2,557) |  |  | 53 |  |  | — |  |  | (2,504) |  |  | 8,299 |  |  | (165) |  |  | — |  |  | 8,134 |
Tax effect | 541 |  |  | (11) |  |  | — |  |  | 530 |  |  | (1,772) |  |  | 34 |  |  | — |  |  | (1,738) |
OCI, net of tax | (2,016) |  |  | 42 |  |  | — |  |  | (1,974) |  |  | 6,527 |  |  | (131) |  |  | — |  |  | 6,396 |
Balance, June 30 | $ | 8,469 |  |  | $ | — |  |  | $ | (2,745) |  |  | $ | 5,724 |  |  | $ | 11,139 |  |  | $ | (77) |  |  | $ | (2,695) |  |  | $ | 8,367 |
A summary of the components of unrealized gains on AFS securities included in OCI follows for the:
| Three Months Ended June 30
| 2021 |  | 2020
| 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 | $ | 36 |  |  | $ | 952 |  |  | $ | 988 |  |  | $ | 253 |  |  | $ | 1,806 |  |  | $ | 2,059 |
Tax effect | — |  |  | (201) |  |  | (201) |  |  | — |  |  | (379) |  |  | (379) |
Unrealized gains (losses), net of tax | $ | 36 |  |  | $ | 751 |  |  | $ | 787 |  |  | $ | 253 |  |  | $ | 1,427 |  |  | $ | 1,680 |
| Six Months Ended June 30
| 2021 |  | 2020
| 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 | $ | 23 |  |  | $ | (2,580) |  |  | $ | (2,557) |  |  | $ | (140) |  |  | $ | 8,510 |  |  | $ | 8,370 |
Reclassification adjustment for net (gains) losses included in net income | — |  |  | — |  |  | — |  |  | — |  |  | (71) |  |  | (71) |
Net unrealized gains (losses) | 23 |  |  | (2,580) |  |  | (2,557) |  |  | (140) |  |  | 8,439 |  |  | 8,299 |
Tax effect | — |  |  | 541 |  |  | 541 |  |  | — |  |  | (1,772) |  |  | (1,772) |
Unrealized gains (losses), net of tax | $ | 23 |  |  | $ | (2,039) |  |  | $ | (2,016) |  |  | $ | (140) |  |  | $ | 6,667 |  |  | $ | 6,527 |

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