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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Summary of the components of accumulated other comprehensive income | A summary of the components of unrealized gains on AFS securities included in OCI follows for the years ended December 31:
| 2019 |  | 2018 |  | 2017
| 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 and Preferred Stocks |  | All Other AFS securities |  | Total
Unrealized gains (losses) arising during the period | $ | 565 |  |  | $ | 11,711 |  |  | $ | 12,276 |  |  | $ | (495 | ) |  | $ | (6,734 | ) |  | $ | (7,229 | ) |  | $ | 407 |  |  | $ | (118 | ) |  | $ | 289 |
Reclassification adjustment for net (gains) losses included in net income | — |  |  | (6 | ) |  | (6 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (142 | ) |  | (142 | )
Net unrealized gains (losses) | 565 |  |  | 11,705 |  |  | 12,270 |  |  | (495 | ) |  | (6,734 | ) |  | (7,229 | ) |  | 407 |  |  | (260 | ) |  | 147 |
Tax effect (1) | — |  |  | (2,458 | ) |  | (2,458 | ) |  | — |  |  | 1,415 |  |  | 1,415 |  |  | — |  |  | 89 |  |  | 89 |
Unrealized gains (losses), net of tax | $ | 565 |  |  | $ | 9,247 |  |  | $ | 9,812 |  |  | $ | (495 | ) |  | $ | (5,319 | ) |  | $ | (5,814 | ) |  | $ | 407 |  |  | $ | (171 | ) |  | $ | 236 |
(1) Calculations are based on a federal income tax rate of 21% in 2019 and 2018 and 34% in 2017. The following table provides a roll-forward of the changes in AOCI by component for the years ended December 31, 2017, 2018 and 2019 (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, 2017 | $ | 30 |  |  | $ | 164 |  |  | $ | (2,972 | ) |  | $ | (2,778 | )
OCI before reclassifications | 289 |  |  | 43 |  |  | 11 |  |  | 343 |
Amounts reclassified from AOCI | (142 | ) |  | — |  |  | 412 |  |  | 270 |
Subtotal | 147 |  |  | 43 |  |  | 423 |  |  | 613 |
Tax effect | 89 |  |  | (15 | ) |  | (144 | ) |  | (70 | )
OCI, net of tax | 236 |  |  | 28 |  |  | 279 |  |  | 543 |
One-time non-cash tax rate adjustment due to the Tax Act | 125 |  |  | 38 |  |  | (530 | ) |  | (367 | )
Balance, December 31, 2017 | 391 |  |  | 230 |  |  | (3,223 | ) |  | (2,602 | )
OCI before reclassifications | (7,229 | ) |  | 33 |  |  | 265 |  |  | (6,931 | )
Amounts reclassified from AOCI | — |  |  | — |  |  | 345 |  |  | 345 |
Subtotal | (7,229 | ) |  | 33 |  |  | 610 |  |  | (6,586 | )
Tax effect | 1,415 |  |  | (7 | ) |  | (128 | ) |  | 1,280 |
OCI, net of tax | (5,814 | ) |  | 26 |  |  | 482 |  |  | (5,306 | )
Adoption of ASU 2016-01 | 223 |  |  | — |  |  | — |  |  | 223 |
Balance, December 31, 2018 | (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 |
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
| 2019 |  | 2018 |  | 2017 |  |
Unrealized gains (losses) on AFS securities |  |  |  |  |  |  |
| $ | 6 |  |  | $ | — |  |  | $ | 142 |  |  | Net gains on sale of AFS securities
| 1 |  |  | — |  |  | 48 |  |  | Federal income tax expense (1)
| $ | 5 |  |  | $ | — |  |  | $ | 94 |  |  | Net income
Change in unrecognized pension cost on defined benefit pension plan |  |  |  |  |  |  |
| $ | 268 |  |  | $ | 345 |  |  | $ | 412 |  |  | Other noninterest expenses
| 56 |  |  | 72 |  |  | 140 |  |  | Federal income tax expense (1)
| $ | 212 |  |  | $ | 273 |  |  | $ | 272 |  |  | Net income
(1) Calculations are based on a federal income tax rate of 21% in 2019 and 2018 and 34% in 2017.

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