Note 3 - Loans and Allowance for Credit Losses - Retail Credit Exposure (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Loans		$ 4,303,758	$ 3,916,619
Retail Portfolio Segment [Member]
Loans		888,459	784,789
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Loans	[1]	837,406	755,036
Retail Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans	[2]	51,053	29,753
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | One to Four Family Mortgages [Member]
Loans		834,310	753,580
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Other Consumer Loans [Member]
Loans		51,053	29,753
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | One to Four Family Mortgages [Member]
Loans		3,096	1,456
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Other Consumer Loans [Member]
Loans		$ 0	$ 0

[1] Home equity lines of credit were reclassified from 1-4 family mortgage loans to other consumer loans during the year ended December 31, 2023. Home equity lines of credit totaled $38.1 million and $37.4 million as of December 31, 2023, and 2022, respectively.

[2] Credit cards to business customers were reclassified from other consumer loans to commercial and industrial during the year ended December 31, 2023. Credit cards to business customers totaled $17.8 million and $16.6 million as of December 31, 2023, and 2022, respectively.