Note 3 - Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Financing Receivable, before Allowance for Credit Loss	$ 4,952,942	$ 4,821,888
Recorded Balance 89 Days and Accruing	0	0
Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	4,070,778	3,918,662
Recorded Balance 89 Days and Accruing	0	0
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, before Allowance for Credit Loss	1,499,086	1,374,522
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	112,646	117,373
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	757,329	778,869
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	1,159,659	1,110,674
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	542,058	537,224
Recorded Balance 89 Days and Accruing	0	0
Retail Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	882,164	903,226
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	763,715	790,857
Recorded Balance 89 Days and Accruing	0	0
Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	118,449	112,369
Recorded Balance 89 Days and Accruing	0	0
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	531	2,157
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	30	580
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, before Allowance for Credit Loss	30	294
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	0	67
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	219
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	501	1,577
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	234	992
Financial Asset, 30 to 59 Days Past Due [Member] \| Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	267	585
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	633	449
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	134	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	0	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	134	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	499	449
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	485	409
Financial Asset, 60 to 89 Days Past Due [Member] \| Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	14	40
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	302	2,922
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	238	2,761
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	0	0
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	238	29
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	2,732
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	64	161
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	21	156
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	43	5
Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	1,466	5,528
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	402	3,341
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, before Allowance for Credit Loss	30	294
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	0	67
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	372	248
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	0	2,732
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	1,064	2,187
Financial Asset, Past Due [Member] \| Retail Portfolio Segment [Member] \| One to Four Family Mortgages [Member]
Financing Receivable, before Allowance for Credit Loss	740	1,557
Financial Asset, Past Due [Member] \| Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	324	630
Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	4,951,476	4,816,360
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	4,070,376	3,915,321
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, before Allowance for Credit Loss	1,499,056	1,374,228
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	112,646	117,306
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	756,957	778,621
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	1,159,659	1,107,942
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	542,058	537,224
Financial Asset, Not Past Due [Member] \| Retail Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	881,100	901,039
Financial Asset, Not Past Due [Member] \| Retail Portfolio Segment [Member] \| One to Four Family Mortgages [Member]
Financing Receivable, before Allowance for Credit Loss	762,975	789,300
Financial Asset, Not Past Due [Member] \| Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	$ 118,125	$ 111,739

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

Sep. 30, 2026

Dec. 31, 2025

Financing Receivable, before Allowance for Credit Loss

$ 4,952,942

$ 4,821,888

Recorded Balance 89 Days and Accruing

Commercial Portfolio Segment [Member]

Financing Receivable, before Allowance for Credit Loss

4,070,778

3,918,662

Recorded Balance 89 Days and Accruing