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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Changes in accumulated other comprehensive income (loss) by component, net of tax |  |  |  |
Beginning balance | $ 1,236,084 | $ 1,203,608 | $ 1,220,434 | $ 994,964
Unrealized gains (losses) on debt securities available for sale: |  |  |  |
Unrealized holding gains (losses) on debt securities available for sale, Tax Effect | 682 | (1,423) | (9,577) | (8,552)
Unrealized holding gains (losses) on debt securities available for sale, Net of Tax | (1,710) | 3,568 | 23,974 | 21,453
Unrealized gains on debt securities transferred from held to maturity to available for sale, Tax Effect |  |  |  | 1,363
Unrealized gains on debt securities transferred from held to maturity to available for sale, Net of Tax |  |  |  | 3,417
Amounts reclassified from accumulated other comprehensive income, Before Tax |  |  | (1,710) | (104)
Amounts reclassified from accumulated other comprehensive income, Tax Effect | 3 | 85 | 492 | 29
Amounts reclassified from accumulated other comprehensive income, Net of Tax | (8) | (212) | (1,218) | (75)
Unrealized gains (losses) on cash flow hedges: |  |  |  |
Unrealized holding gains (losses) on cash flow hedges, Tax Effect | 6 | (239) | (890) | (239)
Unrealized holding gains (losses) on cash flow hedges, Net of Tax | 14 | (598) | (2,233) | (598)
Amounts reclassified from accumulated other comprehensive income, Tax Effect | 76 | 3 | 16 | 3
Amounts reclassified from accumulated other comprehensive income, Net of Tax | 192 | 6 | 42 | 6
Ending balance | 1,255,705 | 1,215,981 | 1,255,705 | 1,215,981
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of tax |  |  |  |
Beginning balance | 37,037 | 14,627 | 14,960 | (6,812)
Unrealized gains (losses) on cash flow hedges: |  |  |  |
Accumulated other comprehensive income (loss) ending balance period, Before Tax | 49,688 | 24,325 | 49,688 | 24,325
Accumulated other comprehensive income (loss) ending balance period, Tax Effect | (14,163) | (6,934) | (14,163) | (6,934)
Ending balance | 35,525 | 17,391 | 35,525 | 17,391
Unrealized gains (losses) on debt securities available for sale |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of tax |  |  |  |
Accumulated other comprehensive income (loss) beginning balance period, Before Tax | 55,436 | 20,459 | 21,192 | (9,528)
Accumulated other comprehensive income (loss) beginning balance period, Tax Effect | (15,802) | (5,832) | (6,032) | 2,716
Beginning balance | 39,634 | 14,627 | 15,160 | (6,812)
Unrealized gains (losses) on debt securities available for sale: |  |  |  |
Unrealized holding gains (losses) on debt securities available for sale, Before Tax | (2,392) | 4,991 | 33,551 | 30,005
Unrealized holding gains (losses) on debt securities available for sale, Tax Effect | 682 | (1,423) | (9,577) | (8,552)
Unrealized holding gains (losses) on debt securities available for sale, Net of Tax | (1,710) | 3,568 | 23,974 | 21,453
Unrealized gains on debt securities transferred from held to maturity to available for sale, Before Tax |  |  |  | 4,780
Unrealized gains on debt securities transferred from held to maturity to available for sale, Tax Effect |  |  |  | (1,363)
Unrealized gains on debt securities transferred from held to maturity to available for sale, Net of Tax |  |  |  | 3,417
Amounts reclassified from accumulated other comprehensive income, Before Tax | 11 | 297 |  |
Amounts reclassified from accumulated other comprehensive income, Tax Effect | 3 | 85 |  |
Amounts reclassified from accumulated other comprehensive income, Net of Tax | (8) | (212) |  |
Unrealized gains (losses) on cash flow hedges: |  |  |  |
Accumulated other comprehensive income (loss) ending balance period, Before Tax | 53,033 | 25,153 | 53,033 | 25,153
Accumulated other comprehensive income (loss) ending balance period, Tax Effect | (15,117) | (7,170) | (15,117) | (7,170)
Ending balance | 37,916 | 17,983 | 37,916 | 17,983
Unrealized gains (losses) on cash flow hedges |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of tax |  |  |  |
Accumulated other comprehensive income (loss) beginning balance period, Before Tax | (3,633) |  | (280) |
Accumulated other comprehensive income (loss) beginning balance period, Tax Effect | 1,036 |  | 80 |
Beginning balance | (2,597) |  | (200) |
Unrealized gains (losses) on cash flow hedges: |  |  |  |
Unrealized holding gains (losses) on cash flow hedges, Before Tax | 20 | (837) | (3,123) | (837)
Unrealized holding gains (losses) on cash flow hedges, Tax Effect | (6) | (239) | 890 | 239
Unrealized holding gains (losses) on cash flow hedges, Net of Tax | 14 | (598) | (2,233) | (598)
Amounts reclassified from accumulated other comprehensive income, Before Tax | 268 | 9 | 58 | 9
Amounts reclassified from accumulated other comprehensive income, Tax Effect | (76) | (3) | (16) | (3)
Amounts reclassified from accumulated other comprehensive income, Net of Tax | 192 | 6 | 42 | 6
Accumulated other comprehensive income (loss) ending balance period, Before Tax | (3,345) | (828) | (3,345) | (828)
Accumulated other comprehensive income (loss) ending balance period, Tax Effect | 954 | 236 | 954 | 236
Ending balance | $ (2,391) | $ (592) | $ (2,391) | $ (592)

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