Note 3 - Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable, before Allowance for Credit Loss	$ 4,915,553	$ 4,821,888
Recorded Balance 89 Days and Accruing	0	0
Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	4,050,396	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	1,537,029	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	119,387	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	803,883	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	1,091,844	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	498,253	537,224
Recorded Balance 89 Days and Accruing	0	0
Retail Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	865,157	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	750,526	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	114,631	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	461	2,157
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	207	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	0	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	73	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	134	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	254	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	58	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	196	585
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	1,222	449
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	0	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	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	1,222	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	1,218	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	4	40
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	584	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	436	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	147	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	289	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	148	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	124	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	24	5
Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	2,267	5,528
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	643	3,341
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, before Allowance for Credit Loss	0	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	220	67
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member] \| Real Estate Owner Occupied Loan [Member]
Financing Receivable, before Allowance for Credit Loss	423	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	1,624	2,187
Financial Asset, Past Due [Member] \| Retail Portfolio Segment [Member] \| One to Four Family Mortgages [Member]
Financing Receivable, before Allowance for Credit Loss	1,400	1,557
Financial Asset, Past Due [Member] \| Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	224	630
Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss	4,913,286	4,816,360
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	4,049,753	3,915,321
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, before Allowance for Credit Loss	1,537,029	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	119,167	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	803,460	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	1,091,844	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	498,253	537,224
Financial Asset, Not Past Due [Member] \| Retail Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss	863,533	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	749,126	789,300
Financial Asset, Not Past Due [Member] \| Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Financing Receivable, before Allowance for Credit Loss	$ 114,407	$ 111,739

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

Jun. 30, 2026

Dec. 31, 2025

Financing Receivable, before Allowance for Credit Loss

$ 4,915,553

$ 4,821,888

Recorded Balance 89 Days and Accruing

Commercial Portfolio Segment [Member]

Financing Receivable, before Allowance for Credit Loss

4,050,396

3,918,662

Recorded Balance 89 Days and Accruing