CONSOLIDATED STATEMENTS OF CONDITION (CURRENT PERIOD UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Available-for-sale securities, book value	$ 757,959	$ 796,960
Held-to-maturity securities, fair value	495,590	506,193
Loans held for sale	$ 11,685	$ 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)	14,554,778	14,567,325
Common stock, outstanding (in shares)	14,554,778	14,567,325