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Consolidated Balance Sheets (Parenthetical) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Statement of Financial Position [Abstract] |  |
Securities Available-for-sale, Amortized Cost | $ 1,172,175,000 | $ 834,850,000
Securities, Available-for-sale, Allowance for Credit Losses | $ 0 |
Common Stock, stated value (in dollars per share) | $ 1 | $ 1
Common Stock, shares authorized (in shares) | 45,000,000 | 45,000,000

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