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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Six months ended June 30, |  |  |  |
Beginning Balance | $ 685,228 | $ 619,241 | $ 657,983 | $ 600,764
Other comprehensive income | 3,569 | 10,939 | 25,189 | 19,570
Ending balance | 693,750 | 636,908 | 693,750 | 636,908
Defined Benefit Pension Plans |  |  |  |
Six months ended June 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: |  |  |  |
Six months ended June 30, |  |  |  |
Beginning Balance | 33,730 | 20 | 12,110 | (8,611)
Other comprehensive income before reclassifications | 3,565 | 10,956 | 24,036 | 19,654
Amounts reclassified from other comprehensive income | 4 | (17) | (44) | (84)
Reclassification of unrealized gains on held-to-maturity securities to available-for-sale |  |  | 1,197 |
Other comprehensive income | 3,569 | 10,939 | 25,189 | 19,570
Ending balance | 37,299 | 10,959 | 37,299 | 10,959
Total |  |  |  |
Six months ended June 30, |  |  |  |
Beginning Balance | 27,460 | (5,851) | 5,840 | (14,482)
Other comprehensive income before reclassifications | 3,565 | 10,956 | 24,036 | 19,654
Amounts reclassified from other comprehensive income | 4 | (17) | (44) | (84)
Reclassification of unrealized gains on held-to-maturity securities to available-for-sale |  |  | 1,197 |
Other comprehensive income | 3,569 | 10,939 | 25,189 | 19,570
Ending balance | $ 31,029 | $ 5,088 | $ 31,029 | $ 5,088

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