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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Summary of the components of accumulated other comprehensive income | A summary of the components of unrealized holding gains on AFS securities included in OCI follows for the:
| Three Months Ended June 30
| 2018 |  | 2017
| 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 | $ | 123 |  |  | $ | (2,101 | ) |  | $ | (1,978 | ) |  | $ | 186 |  |  | $ | 2,384 |  |  | $ | 2,570 |
Reclassification adjustment for net (gains) losses included in net income | — |  |  | — |  |  | — |  |  | — |  |  | (142 | ) |  | (142 | )
Net unrealized gains (losses) | 123 |  |  | (2,101 | ) |  | (1,978 | ) |  | 186 |  |  | 2,242 |  |  | 2,428 |
Tax effect | — |  |  | 442 |  |  | 442 |  |  | — |  |  | (762 | ) |  | (762 | )
Unrealized gains (losses), net of tax | $ | 123 |  |  | $ | (1,659 | ) |  | $ | (1,536 | ) |  | $ | 186 |  |  | $ | 1,480 |  |  | $ | 1,666 |
| Six Months Ended June 30
| 2018 |  | 2017
| 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 | $ | 86 |  |  | $ | (10,121 | ) |  | $ | (10,035 | ) |  | $ | 541 |  |  | $ | 3,706 |  |  | $ | 4,247 |
Reclassification adjustment for net (gains) losses included in net income | — |  |  | — |  |  | $ | — |  |  | — |  |  | (142 | ) |  | $ | (142 | )
Net unrealized gains (losses) | 86 |  |  | (10,121 | ) |  | (10,035 | ) |  | 541 |  |  | 3,564 |  |  | 4,105 |
Tax effect | — |  |  | 2,126 |  |  | 2,126 |  |  | — |  |  | (1,212 | ) |  | (1,212 | )
Unrealized gains (losses), net of tax | $ | 86 |  |  | $ | (7,995 | ) |  | $ | (7,909 | ) |  | $ | 541 |  |  | $ | 2,352 |  |  | $ | 2,893 |
The following table summarizes the changes in AOCI by component for the:
| Three Months Ended June 30
| 2018 |  | 2017
| Unrealized Holding Gains (Losses) on AFS Securities |  | Unrealized Gains (Losses) on Derivative Instruments |  | Defined Benefit Pension Plan |  | Total |  | Unrealized Holding Gains (Losses) on AFS Securities |  | Unrealized Gains (Losses) on Derivative Instruments |  | Defined Benefit Pension Plan |  | Total
Balance, April 1 | $ | (5,759 | ) |  | $ | 326 |  |  | $ | (3,223 | ) |  | $ | (8,656 | ) |  | $ | 1,257 |  |  | $ | 175 |  |  | $ | (2,972 | ) |  | (1,540 | )
OCI before reclassifications | (1,978 | ) |  | 31 |  |  | — |  |  | (1,947 | ) |  | 2,570 |  |  | (61 | ) |  | — |  |  | 2,509 |
Amounts reclassified from AOCI | — |  |  | — |  |  | — |  |  | — |  |  | (142 | ) |  | — |  |  | — |  |  | (142 | )
Subtotal | (1,978 | ) |  | 31 |  |  | — |  |  | (1,947 | ) |  | 2,428 |  |  | (61 | ) |  | — |  |  | 2,367 |
Tax effect | 442 |  |  | (6 | ) |  | — |  |  | 436 |  |  | (762 | ) |  | 21 |  |  | — |  |  | (741 | )
OCI, net of tax | (1,536 | ) |  | 25 |  |  | — |  |  | (1,511 | ) |  | 1,666 |  |  | (40 | ) |  | — |  |  | 1,626 |
Balance, June 30 | $ | (7,295 | ) |  | $ | 351 |  |  | $ | (3,223 | ) |  | $ | (10,167 | ) |  | $ | 2,923 |  |  | $ | 135 |  |  | $ | (2,972 | ) |  | $ | 86 |
| Six Months Ended June 30
| 2018 |  | 2017
| Unrealized Holding Gains (Losses) on AFS Securities |  | Unrealized Gains (Losses) on Derivative Instruments |  | Defined Benefit Pension Plan |  | Total |  | Unrealized Holding Gains (Losses) on AFS Securities |  | Unrealized Gains (Losses) on Derivative Instruments |  | Defined Benefit Pension Plan |  | Total
Balance, January 1 | $ | 391 |  |  | $ | 230 |  |  | $ | (3,223 | ) |  | $ | (2,602 | ) |  | $ | 30 |  |  | $ | 164 |  |  | $ | (2,972 | ) |  | $ | (2,778 | )
OCI before reclassifications | (10,035 | ) |  | 153 |  |  | — |  |  | (9,882 | ) |  | 4,247 |  |  | (44 | ) |  | — |  |  | 4,203 |
Amounts reclassified from AOCI | — |  |  | — |  |  | — |  |  | — |  |  | (142 | ) |  | — |  |  | — |  |  | (142 | )
Subtotal | (10,035 | ) |  | 153 |  |  | — |  |  | (9,882 | ) |  | 4,105 |  |  | (44 | ) |  | — |  |  | 4,061 |
Tax effect | 2,126 |  |  | (32 | ) |  | — |  |  | 2,094 |  |  | (1,212 | ) |  | 15 |  |  | — |  |  | (1,197 | )
OCI, net of tax | (7,909 | ) |  | 121 |  |  | — |  |  | (7,788 | ) |  | 2,893 |  |  | (29 | ) |  | — |  |  | 2,864 |
Adoption of ASU 2016-01 | 223 |  |  | — |  |  | — |  |  | 223 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance, June 30 | $ | (7,295 | ) |  | $ | 351 |  |  | $ | (3,223 | ) |  | $ | (10,167 | ) |  | $ | 2,923 |  |  | $ | 135 |  |  | $ | (2,972 | ) |  | $ | 86 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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