Note 3 - Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, before Allowance for Credit Loss	$ 4,636,549	$ 4,600,781
Recorded Balance 89 Days and Accruing	0	0
Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	3,751,591	3,707,304
Recorded Balance 89 Days and Accruing	0	0
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, before Allowance for Credit Loss	1,314,383	1,287,308
Recorded Balance 89 Days and Accruing	0	0
Commercial Portfolio Segment [Member] \| Vacant Land and Land Development and Residential Construction Loan [Member]
Financing Receivable, before Allowance for Credit Loss	68,790	66,936
Recorded Balance 89 Days and Accruing	0	0
Commercial Portfolio Segment [Member] \| Real Estate Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	705,645	748,837
Recorded Balance 89 Days and Accruing	0	0
Commercial Portfolio Segment [Member] \| Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	1,183,728	1,128,404
Recorded Balance 89 Days and Accruing	0	0
Commercial Portfolio Segment [Member] \| Real Estate Multi Family and Residential Rental Loan [Member]
Financing Receivable, before Allowance for Credit Loss	479,045	475,819
Recorded Balance 89 Days and Accruing	0	0
Retail Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	884,958	893,477
Recorded Balance 89 Days and Accruing	0	0
Retail Portfolio Segment [Member] \| One to Four Family Mortgages [Member]
Financing Receivable, before Allowance for Credit Loss	817,212	827,597
Recorded Balance 89 Days and Accruing	0	0
Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	67,746	65,880
Recorded Balance 89 Days and Accruing	0	0
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	85	2,494
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	4	17
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, before Allowance for Credit Loss	0	5
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Vacant Land and Land Development and Residential Construction Loan [Member]
Financing Receivable, before Allowance for Credit Loss	4	12
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Multi Family and Residential Rental Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Retail Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	81	2,477
Financial Asset, 30 to 59 Days Past Due [Member] \| Retail Portfolio Segment [Member] \| One to Four Family Mortgages [Member]
Financing Receivable, before Allowance for Credit Loss	57	2,365
Financial Asset, 30 to 59 Days Past Due [Member] \| Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	24	112
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	140	713
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	4	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, before Allowance for Credit Loss	4	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Vacant Land and Land Development and Residential Construction Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Multi Family and Residential Rental Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Retail Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	136	713
Financial Asset, 60 to 89 Days Past Due [Member] \| Retail Portfolio Segment [Member] \| One to Four Family Mortgages [Member]
Financing Receivable, before Allowance for Credit Loss	136	713
Financial Asset, 60 to 89 Days Past Due [Member] \| Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	936	1,046
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	274	864
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, before Allowance for Credit Loss	274	864
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Vacant Land and Land Development and Residential Construction Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Multi Family and Residential Rental Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Retail Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	662	182
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Retail Portfolio Segment [Member] \| One to Four Family Mortgages [Member]
Financing Receivable, before Allowance for Credit Loss	662	182
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	1,161	4,253
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	282	881
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, before Allowance for Credit Loss	278	869
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member] \| Vacant Land and Land Development and Residential Construction Loan [Member]
Financing Receivable, before Allowance for Credit Loss	4	12
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Multi Family and Residential Rental Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due [Member] \| Retail Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	879	3,372
Financial Asset, Past Due [Member] \| Retail Portfolio Segment [Member] \| One to Four Family Mortgages [Member]
Financing Receivable, before Allowance for Credit Loss	855	3,260
Financial Asset, Past Due [Member] \| Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	24	112
Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	4,635,388	4,596,528
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	3,751,309	3,706,423
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, before Allowance for Credit Loss	1,314,105	1,286,439
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member] \| Vacant Land and Land Development and Residential Construction Loan [Member]
Financing Receivable, before Allowance for Credit Loss	68,786	66,924
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	705,645	748,837
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	1,183,728	1,128,404
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Multi Family and Residential Rental Loan [Member]
Financing Receivable, before Allowance for Credit Loss	479,045	475,819
Financial Asset, Not Past Due [Member] \| Retail Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	884,079	890,105
Financial Asset, Not Past Due [Member] \| Retail Portfolio Segment [Member] \| One to Four Family Mortgages [Member]
Financing Receivable, before Allowance for Credit Loss	816,357	824,337
Financial Asset, Not Past Due [Member] \| Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	$ 67,722	$ 65,768

Note 3 - Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans (Details) - USD ($)
$ in Thousands

Mar. 31, 2025

Dec. 31, 2024

Financing Receivable, before Allowance for Credit Loss

$ 4,636,549

$ 4,600,781

Recorded Balance 89 Days and Accruing

Commercial Portfolio Segment [Member]

Financing Receivable, before Allowance for Credit Loss

3,751,591

3,707,304

Recorded Balance 89 Days and Accruing