CONSOLIDATED STATEMENTS OF CONDITION (CURRENT PERIOD UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Available-for-sale securities, book value	$ 777,621	$ 796,960
Held-to-maturity securities, fair value	510,999	506,193
Loans held for sale	$ 4,539	$ 5,259
Common stock, no par value (dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	40,000,000	40,000,000
Common stock, issued (in shares)	14,587,906	14,567,325
Common stock, outstanding (in shares)	14,587,906	14,567,325