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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Debt securities available-for-sale at amortized cost | $ 1,524,014 | $ 978,774
Shareholders' equity: |  |
Preferred stock, shares authorized (in shares) | 300,000 | 300,000
Common stock, par value (in dollars per share) | $ 5.00 | $ 5.00
Common stock, shares authorized (in shares) | 25,000,000 | 25,000,000
Common stock, shares outstanding (in shares) | 17,837,313 | 17,810,401

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