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Other Comprehensive Income (Loss) - Schedule of Activity in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balances at Beginning | $ 682,597 | $ 647,267 | $ 663,054 | $ 620,871
Other comprehensive income | 223 | 10,776 | 22,516 | 22,991
Balances at Ending | 698,029 | 657,677 | 698,029 | 657,677
Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balances at Beginning |  |  | 1,707 |
Available-for- Sale Debt Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balances at Beginning | 25,838 | (11,695) | 4,039 | (23,589)
Other comprehensive income (loss) before reclassifications | (257) | 10,676 | 21,866 | 22,570
Amounts reclassified from accumulated other comprehensive (loss) income | 0 | (204) | (324) | (204)
Other comprehensive income | (257) | 10,472 | 21,542 | 22,366
Balances at Ending | 25,581 | (1,223) | 25,581 | (1,223)
Employee Benefit Plans |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balances at Beginning | (47,109) | (39,255) | (47,603) | (39,576)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive (loss) income | 480 | 304 | 974 | 625
Other comprehensive income | 480 | 304 | 974 | 625
Balances at Ending | (46,629) | (38,951) | (46,629) | (38,951)
Accumulated Other Comprehensive (Loss) Income |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balances at Beginning | (21,271) | (50,950) | (43,564) | (63,165)
Other comprehensive income (loss) before reclassifications | (257) | 10,676 | 21,866 | 22,570
Amounts reclassified from accumulated other comprehensive (loss) income | 480 | 100 | 650 | 421
Other comprehensive income | 223 | 10,776 | 22,516 | 22,991
Balances at Ending | $ (21,048) | $ (40,174) | $ (21,048) | $ (40,174)

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