Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ / shares in Thousands, $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt securities held to maturity, allowance for credit losses	$ 1	$ 1
Debt securities held to maturity, fair value	$ 817,071	$ 849,562
Common Stock, No Par Value (in dollars per share)	$ 0	$ 0
Common Stock, Shares Authorized (in shares)	150,000	150,000
Common Stock, Shares, Issued (in shares)	26,683	26,671
Common Stock, Shares, Outstanding (in shares)	26,683	26,671