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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
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Statement of Financial Position [Abstract] |  |
Securities Available-for-Sale, Amortized Cost | $ 921,890,000 | $ 834,850,000
Debt securities, available-for-sale, allowance for credit losses | $ 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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