Note 4 - Fair Value Measurements - Carrying Values and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt securities available for sale (at fair value)	$ 502,762	$ 405,201
Tax-exempt state and political subdivisions	94,227	96,163
Equity investments (at fair value)	10,958	29,494
Cash surrender value of life insurance policies and annuities	85,679	71,640
Derivative financial instruments	33,145	40,506
Reported Value Measurement [Member]
Cash and cash equivalents	52,232	44,717
Debt securities available for sale (at fair value)	502,762	405,201
Tax-exempt state and political subdivisions	94,227	96,163
Equity investments (at fair value)	10,958	29,494
Other investments	21,130	16,029
Loans, net	3,633,522	3,043,919
Accrued interest receivable	20,004	15,866
Cash surrender value of life insurance policies and annuities	85,679	71,640
Derivative financial instruments	33,145	40,506
Assets, Fair Value Disclosure	4,453,659	3,763,535
Deposits	3,715,148	3,169,879
Short-term borrowings	302,957	225,999
Long-term borrowings	637	658
Subordinated debentures	103,782	103,296
Subordinated debentures owed to unconsolidated subsidiary trusts	19,589	19,589
Accrued interest payable	3,980	2,357
Financial Liabilities Fair Value Disclosure	4,146,093	3,521,778
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	52,232	44,717
Debt securities available for sale (at fair value)	502,762	405,201
Tax-exempt state and political subdivisions	88,319	86,627
Equity investments (at fair value)	10,958	29,494
Other investments	21,130	16,029
Loans, net	3,467,324	2,966,814
Accrued interest receivable	20,004	15,866
Cash surrender value of life insurance policies and annuities	85,679	71,640
Derivative financial instruments	33,145	40,506
Assets, Fair Value Disclosure	4,281,553	3,676,894
Deposits	3,706,250	3,155,725
Short-term borrowings	302,957	225,999
Long-term borrowings	642	667
Subordinated debentures	90,902	91,801
Subordinated debentures owed to unconsolidated subsidiary trusts	19,589	19,589
Accrued interest payable	3,980	2,357
Financial Liabilities Fair Value Disclosure	4,124,320	3,496,138
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	21,834	16,469
Debt securities available for sale (at fair value)	0	0
Tax-exempt state and political subdivisions	0	0
Equity investments (at fair value)	6,557	25,766
Other investments	0	0
Loans, net	0	0
Accrued interest receivable	0	0
Cash surrender value of life insurance policies and annuities	0	0
Derivative financial instruments	0	0
Assets, Fair Value Disclosure	28,391	42,235
Deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Subordinated debentures	0	0
Subordinated debentures owed to unconsolidated subsidiary trusts	0	0
Accrued interest payable	0	0
Financial Liabilities Fair Value Disclosure	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	30,398	28,248
Debt securities available for sale (at fair value)	498,155	403,361
Tax-exempt state and political subdivisions	88,319	86,627
Equity investments (at fair value)	4,401	3,728
Other investments	21,130	16,029
Loans, net	14,373	3,583
Accrued interest receivable	20,004	15,866
Cash surrender value of life insurance policies and annuities	85,679	71,640
Derivative financial instruments	33,145	40,506
Assets, Fair Value Disclosure	795,604	669,588
Deposits	3,706,250	3,155,725
Short-term borrowings	302,957	225,999
Long-term borrowings	642	667
Subordinated debentures	90,902	91,801
Subordinated debentures owed to unconsolidated subsidiary trusts	19,589	19,589
Accrued interest payable	3,980	2,357
Financial Liabilities Fair Value Disclosure	4,124,320	3,496,138
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Debt securities available for sale (at fair value)	4,607	1,840
Tax-exempt state and political subdivisions	0	0
Equity investments (at fair value)	0	0
Other investments	0	0
Loans, net	3,452,951	2,963,231
Accrued interest receivable	0	0
Cash surrender value of life insurance policies and annuities	0	0
Derivative financial instruments	0	0
Assets, Fair Value Disclosure	3,457,558	2,965,071
Deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Subordinated debentures	0	0
Subordinated debentures owed to unconsolidated subsidiary trusts	0	0
Accrued interest payable	0	0
Financial Liabilities Fair Value Disclosure	$ 0	$ 0