CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Debt securities, available-for-sale, amortized cost	$ 1,300,719,000	$ 1,283,146,000
Debt securities, held-to-maturity, fair value	$ 478,509,000	$ 369,955,000
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)	29,857,920	29,814,401
Treasury stock, shares (in shares)	1,643,461	1,577,359
Debt securities available for sale, allowance for credit loss	$ 0	$ 0
Debt securities held to maturity, allowance for credit loss	$ 241,000	$ 286,000