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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Balance | $ 579,672 | $ 549,464 | $ 532,608
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act to Retained Earnings |  |  | 2,073
Impact of adoption of Accounting Standard Update 2016-01 | (875) |  |
Total other comprehensive income (loss) , net of tax | (6,459) | 2,945 | (2,472)
Balance | 618,997 | 579,672 | 549,464
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |
Balance | (3,982) | (15,649) | (5,522)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act to Retained Earnings |  |  | (1,325)
Other comprehensive income before reclassifications, net of tax | 4,787 | 11,657 | (10,127)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 485 | 10 | 1,325
Total other comprehensive income (loss) , net of tax | 5,272 | 11,667 | (8,802)
Balance | 1,290 | (3,982) | (15,649)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |
Balance | (5,863) | 3,704 | 231
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act to Retained Earnings |  |  | 50
Other comprehensive income before reclassifications, net of tax | (14,924) | (8,606) | 3,351
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 3,266 | (961) | 72
Total other comprehensive income (loss) , net of tax | (11,658) | (9,567) | 3,423
Balance | (17,521) | (5,863) | 3,704
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Balance | (983) | (1,673) | (3,695)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act to Retained Earnings |  |  | (798)
Other comprehensive income before reclassifications, net of tax | (1,112) | 661 | 2,484
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 211 | 29 | 336
Total other comprehensive income (loss) , net of tax | (901) | 690 | 2,820
Balance | (1,884) | (983) | (1,673)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member] |  |  |
Balance | 1,021 | 866 |
Impact of adoption of Accounting Standard Update 2016-01 |  |  | 779
Other comprehensive income before reclassifications, net of tax | 828 | 155 | 87
Total other comprehensive income (loss) , net of tax | 828 | 155 | 87
Balance | 1,849 | 1,021 | 866
AOCI Attributable to Parent [Member] |  |  |
Balance | (9,807) | (12,752) | (8,986)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act to Retained Earnings |  |  | (2,073)
Impact of adoption of Accounting Standard Update 2016-01 | 0 |  | 779
Other comprehensive income before reclassifications, net of tax | (10,421) | 3,867 | (4,205)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 3,962 | (922) | 1,733
Total other comprehensive income (loss) , net of tax | (6,459) | 2,945 | (2,472)
Balance | $ (16,266) | $ (9,807) | $ (12,752)

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- Definition Represents the amount of reclassification of the tax effects from AOCI to Retained Earnings due to the enactment of the Tax Cuts and Jobs Act. + References No definition available. + Details
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