CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Debt securities, available-for-sale, amortized cost	$ 1,184,288,000	$ 1,300,719,000
Debt securities, held-to-maturity, fair value	$ 612,022,000	$ 478,509,000
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)	36,736,041	29,857,920
Treasury stock, shares (in shares)	1,511,348	1,643,461
Debt securities available for sale, allowance for credit loss	$ 0	$ 0
Debt securities held to maturity, allowance for credit loss	$ 238,000	$ 241,000