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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
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Statement of Financial Position [Abstract] |  |
Debt securities, available-for-sale, amortized cost | $ 1,262,319,000 | $ 1,184,288,000
Debt securities, held-to-maturity, fair value | $ 602,112,000 | $ 612,022,000
Preferred stock, no par value (in usd per share) | $ 0 | $ 0
Preferred stock, shares authorized (in shares) | 50,000 | 50,000
Preferred stock, shares issued (in shares) | 0 | 0
Common stock, no par value (in usd per share) | $ 0 | $ 0
Common stock, shares authorized (in shares) | 50,000,000 | 50,000,000
Common stock, shares issued (in shares) | 36,747,787 | 36,736,041
Treasury stock (in shares) | 1,355,337 | 1,511,348
Debt securities available for sale, allowance for credit loss | $ 0 | $ 0
Debt securities held to maturity, allowance for credit loss | $ 238,000 | $ 238,000

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