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Comprehensive Income - Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Stockholders' equity, beginning balance | $ 334,392 | $ 301,728
Other comprehensive income or loss before reclassifications | (2,337) | 3,879
Amounts reclassified from accumulated other comprehensive income | 57 | 66
Other Comprehensive (Loss) Income | (2,280) | 3,945
Stockholders' equity, ending balance | 342,413 | 309,398
AOCI Attributable to Parent |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Stockholders' equity, beginning balance | (816) | (6,357)
Stockholders' equity, ending balance | (3,096) | (2,412)
Unrealized Gains and Losses on Available for Sale Securities |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Stockholders' equity, beginning balance | 5,799 | 465
Other comprehensive income or loss before reclassifications | (3,812) | 4,098
Amounts reclassified from accumulated other comprehensive income | 0 | 0
Other Comprehensive (Loss) Income | (3,812) | 4,098
Stockholders' equity, ending balance | 1,987 | 4,563
Unrealized Loss on Cash Flow Swap |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Stockholders' equity, beginning balance | 485 | 0
Other comprehensive income or loss before reclassifications | 1,475 | (219)
Amounts reclassified from accumulated other comprehensive income | (20) | 0
Other Comprehensive (Loss) Income | 1,455 | (219)
Stockholders' equity, ending balance | 1,940 | (219)
Net Actuarial Gain (Loss) |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Stockholders' equity, beginning balance | (5,929) | (5,847)
Other comprehensive income or loss before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive income | 34 | 27
Other Comprehensive (Loss) Income | 34 | 27
Stockholders' equity, ending balance | (5,895) | (5,820)
Net Prior Service (Cost) Credit |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Stockholders' equity, beginning balance | (1,171) | (975)
Other comprehensive income or loss before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive income | 43 | 39
Other Comprehensive (Loss) Income | 43 | 39
Stockholders' equity, ending balance | $ (1,128) | $ (936)

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