Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets
Available-for-sale Securities, Amortized Cost Basis	$ 839,682	$ 734,544
Debt Securities, Held-to-maturity, Fair Value	179,887	68,082
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 201	$ 60
Stockholders’ equity
Preferred Stock, No Par Value	$ 0	$ 0
Preferred Stock, Shares Authorized	50,000	50,000
Preferred Stock, Shares Issued	0	0
Common Stock, No Par Value	$ 0	$ 0
Common Stock, Shares Authorized	24,000,000
Common Stock, Shares, Issued	21,208,689	21,193,402
Treasury Stock, Shares	1,605,492	1,686,046