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Consolidated Balance Sheets (Parenthetical) - USD ($) $ / shares in Thousands, $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale, Amortized Cost | $ 4,081,118 | $ 3,703,096
Preferred Stock, No Par Value | $ 0 | $ 0
Common Stock, No Par Value | $ 0 | $ 0

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