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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Statement of Financial Position [Abstract] |  |
Securities Available-for-Sale, Amortized Cost | $ 1,681,122,000 | $ 1,172,175,000
Securities Available-for-Sale, Allowance for Credit Losses | $ 0 | $ 0
Common stock, stated value (USD per share) | $ 1 | $ 1
Common stock, shares authorized (in shares) | 45,000,000 | 45,000,000

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