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Note 3 - Loans and Allowance for Credit Losses - Activity in Allowance for Loan Losses and the Recorded Investments in Loans (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Balance $ 35,974,000 $ 35,913,000 $ 35,363,000 $ 37,967,000  
Financing Receivable, Credit Loss, Expense (Reversal) 2,900,000 1,900,000 3,500,000 (900,000)  
Charge-offs 0 (743,000) (219,000) (865,000)  
Recoveries 246,000 353,000 876,000 1,221,000  
Balance 39,120,000 37,423,000 39,120,000 37,423,000  
Ending balance: individually evaluated for impairment   765,000   765,000  
Ending balance: collectively evaluated for impairment   36,658,000   36,658,000  
Ending balance [1]         $ 3,413,349,000
Ending balance: individually evaluated for impairment [1]         19,366,000
Ending balance: collectively evaluated for impairment [1]         3,393,983,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Balance     (400,000)    
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]          
Balance 8,608,000 9,340,000 10,782,000 9,424,000  
Financing Receivable, Credit Loss, Expense (Reversal) 1,110,000 1,518,000 518,000 647,000  
Charge-offs 0 (690,000) (170,000) (54,000)  
Recoveries 22,000 10,000 181,000 161,000  
Balance 9,740,000 10,178,000 9,740,000 10,178,000  
Ending balance: individually evaluated for impairment   449,000   449,000  
Ending balance: collectively evaluated for impairment   9,729,000   9,729,000  
Ending balance [1]         1,097,309,000
Ending balance: individually evaluated for impairment [1]         5,010,000
Ending balance: collectively evaluated for impairment [1]         1,092,299,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Balance     (1,571,000)    
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]          
Balance 446,000 479,000 420,000 679,000  
Financing Receivable, Credit Loss, Expense (Reversal) 21,000 (180,000) 117,000 307,000  
Charge-offs 0 0 (29,000) (705,000)  
Recoveries 1,000 127,000 3,000 145,000  
Balance 468,000 426,000 468,000 426,000  
Ending balance: individually evaluated for impairment   0   0  
Ending balance: collectively evaluated for impairment   426,000   426,000  
Ending balance         43,239,000
Ending balance: individually evaluated for impairment         0
Ending balance: collectively evaluated for impairment         43,239,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Balance     (43,000)    
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]          
Balance 5,578,000 7,701,000 6,045,000 8,246,000  
Financing Receivable, Credit Loss, Expense (Reversal) 372,000 (1,151,000) 407,000 (2,028,000)  
Charge-offs 0 0 0 (12,000)  
Recoveries 22,000 76,000 80,000 420,000  
Balance 5,972,000 6,626,000 5,972,000 6,626,000  
Ending balance: individually evaluated for impairment   89,000   89,000  
Ending balance: collectively evaluated for impairment   6,537,000   6,537,000  
Ending balance         565,758,000
Ending balance: individually evaluated for impairment         10,435,000
Ending balance: collectively evaluated for impairment         555,323,000
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Balance     (560,000)    
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]          
Balance 9,614,000 12,785,000 13,301,000 13,611,000  
Financing Receivable, Credit Loss, Expense (Reversal) (108,000) 1,523,000 (1,261,000) 697,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Balance 9,506,000 14,308,000 9,506,000 14,308,000  
Ending balance: individually evaluated for impairment   6,000   6,000  
Ending balance: collectively evaluated for impairment   14,302,000   14,302,000  
Ending balance         1,027,415,000
Ending balance: individually evaluated for impairment         146,000
Ending balance: collectively evaluated for impairment         1,027,269,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Balance     (2,534,000)    
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]          
Balance 1,274,000 1,787,000 1,695,000 1,819,000  
Financing Receivable, Credit Loss, Expense (Reversal) (21,000) 157,000 165,000 125,000  
Charge-offs 0 0 0 0  
Recoveries 23,000 0 37,000 0  
Balance 1,276,000 1,944,000 1,276,000 1,944,000  
Ending balance: individually evaluated for impairment   0   0  
Ending balance: collectively evaluated for impairment   1,944,000   1,944,000  
Ending balance         176,593,000
Ending balance: individually evaluated for impairment         91,000
Ending balance: collectively evaluated for impairment         176,502,000
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Balance     (621,000)    
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]          
Balance 10,267,000 2,894,000 2,449,000 3,240,000  
Financing Receivable, Credit Loss, Expense (Reversal) 1,530,000 97,000 3,587,000 (503,000)  
Charge-offs 0 (30,000) (2,000) (64,000)  
Recoveries 154,000 98,000 522,000 386,000  
Balance 11,951,000 3,059,000 11,951,000 3,059,000  
Ending balance: individually evaluated for impairment   79,000   79,000  
Ending balance: collectively evaluated for impairment   2,980,000   2,980,000  
Ending balance         442,547,000
Ending balance: individually evaluated for impairment         2,437,000
Ending balance: collectively evaluated for impairment         440,110,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Balance     5,395,000    
Retail Portfolio Segment [Member] | Home Equity and Other [Member]          
Balance 165,000 742,000 626,000 889,000  
Financing Receivable, Credit Loss, Expense (Reversal) (13,000) (64,000) (74,000) (271,000)  
Charge-offs 0 (23,000) (18,000) (30,000)  
Recoveries 24,000 42,000 53,000 109,000  
Balance 176,000 697,000 176,000 697,000  
Ending balance: individually evaluated for impairment   142,000   142,000  
Ending balance: collectively evaluated for impairment   555,000   555,000  
Ending balance         60,488,000
Ending balance: individually evaluated for impairment         1,247,000
Ending balance: collectively evaluated for impairment         $ 59,241,000
Retail Portfolio Segment [Member] | Home Equity and Other [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Balance     (411,000)    
Unallocated Financing Receivables [Member]          
Balance 22,000 185,000 45,000 59,000  
Financing Receivable, Credit Loss, Expense (Reversal) 9,000 0 41,000 126,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Balance $ 31,000 185,000 31,000 185,000  
Ending balance: individually evaluated for impairment   0   0  
Ending balance: collectively evaluated for impairment   $ 185,000   $ 185,000  
Unallocated Financing Receivables [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Balance     $ (55,000)    
[1] Excludes $40.1 million in loans originated under the Paycheck Protection Program.