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Accumulated Other Comprehensive Loss - Schedule of Changes In Each Component of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Nine months ended September 30, |  |  |  |
Beginning Balance | $ 693,750 | $ 636,908 | $ 657,983 | $ 600,764
Other comprehensive income | (539) | 6,307 | 24,650 | 25,877
Ending balance | 691,359 | 649,603 | 691,359 | 649,603
Defined Benefit Pension Plans |  |  |  |
Nine months ended September 30, |  |  |  |
Beginning Balance | (6,270) | (5,871) | (6,270) | (5,871)
Ending balance | (6,270) | (5,871) | (6,270) | (5,871)
Securities available-for-sale: |  |  |  |
Nine months ended September 30, |  |  |  |
Beginning Balance | 37,299 | 10,959 | 12,110 | (8,611)
Other comprehensive income before reclassifications | (539) | 6,277 | 23,497 | 25,931
Amounts reclassified from other comprehensive income | 0 | 30 | (44) | (54)
Reclassification of unrealized gains on held-to-maturity securities to available-for-sale | 0 |  | 1,197 |
Other comprehensive income | (539) | 6,307 | 24,650 | 25,877
Ending balance | 36,760 | 17,266 | 36,760 | 17,266
Total |  |  |  |
Nine months ended September 30, |  |  |  |
Beginning Balance | 31,029 | 5,088 | 5,840 | (14,482)
Other comprehensive income before reclassifications | (539) | 6,277 | 23,497 | 25,931
Amounts reclassified from other comprehensive income | 0 | 30 | (44) | (54)
Reclassification of unrealized gains on held-to-maturity securities to available-for-sale | 0 |  | 1,197 |
Other comprehensive income | (539) | 6,307 | 24,650 | 25,877
Ending balance | $ 30,490 | $ 11,395 | $ 30,490 | $ 11,395

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