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Changes in Accumulated Other Comprehensive Income by Component - Reclassification Adjustments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Tax benefit (expense) $ (30,504) $ (20,515) $ (16,386)
Net income 98,682 64,581 83,524
Realized Gains (Losses) on Sale of Available-for-sale Securities | Amounts Reclassified from Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
(Losses) gains from the sale of available-for-sale securities (114) 111 (197)
Tax benefit (expense) 27 (24) 32
Net income $ (87) $ 87 $ (165)