Note 4 - Securities (Details Textual) $ in Thousands	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Number of Temporarily Impaired Securities	579
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value	$ 661,111
Continuous Unrealized Loss Position Aggregate Losses	$ 70,997
Number of Temporarily Impaired Securities Greater than Twelve Months	116
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value	$ 106,949	$ 51,999
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses	22,130	2,145
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	630,515
Restricted Stock [Member]
Restricted Investments	$ 941	845
US Government Agencies Debt Securities [Member]
Number of Temporarily Impaired Securities	77
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value	$ 64,695
Continuous Unrealized Loss Position Aggregate Losses	12,228
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value	64,695	26,792
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses	$ 12,228	1,180
US States and Political Subdivisions Debt Securities [Member]
Number of Temporarily Impaired Securities	35
Continuous Unrealized Loss Position Aggregate Losses	$ 9,310
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value	32,812	20,542
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses	$ 9,310	$ 793
Collateralized Mortgage-Backed Securities [Member]
Number of Temporarily Impaired Securities	4
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value	$ 9,442
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value	$ 592