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Consolidated Balance Sheets (Parenthetical) - USD ($) $ / shares in Thousands, $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale, Amortized Cost | $ 5,898,041 | $ 4,997,529
Debt Securities, Held-to-maturity, Fair Value | $ 2,122,606 | $ 0
Preferred Stock, No Par Value | $ 0 | $ 0
Common stock, par value | $ 0 | $ 0

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