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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 ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Balance $ 35,363,000 $ 37,967,000 $ 23,889,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 42,246,000 35,363,000 37,967,000
Provision for credit losses 6,550,000 (4,300,000) 14,050,000
Charge-offs (292,000) (1,044,000) (838,000)
Recoveries 1,025,000 2,740,000 866,000
Balance 42,246,000 35,363,000 37,967,000
Ending balance: individually evaluated for impairment   546,000 551,000
Ending balance: collectively evaluated for impairment   34,817,000 37,416,000
Ending balance   3,413,349,000 [1] 2,828,211,000 [2]
Ending balance: individually evaluated for impairment   19,366,000 [1] 26,958,000 [2]
Ending balance: collectively evaluated for impairment   3,393,983,000 [1] 2,801,253,000 [2]
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Loss, Ending Balance (400,000)    
Balance (400,000)    
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Balance 10,782,000 9,424,000 6,659,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 10,203,000 10,782,000 9,424,000
Provision for credit losses 946,000 2,030,000 2,921,000
Charge-offs (171,000) (882,000) (247,000)
Recoveries 217,000 210,000 91,000
Balance 10,203,000 10,782,000 9,424,000
Ending balance: individually evaluated for impairment   266,000 53,000
Ending balance: collectively evaluated for impairment   10,516,000 9,371,000
Ending balance   1,097,309,000 [1] 780,164,000 [2]
Ending balance: individually evaluated for impairment   5,010,000 [1] 6,585,000 [2]
Ending balance: collectively evaluated for impairment   1,092,299,000 [1] 773,579,000 [2]
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Loss, Ending Balance (1,571,000)    
Balance (1,571,000)    
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Balance 420,000 679,000 466,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 490,000 420,000 679,000
Provision for credit losses 138,000 (618,000) 289,000
Charge-offs (29,000) (15,000) (113,000)
Recoveries 4,000 374,000 37,000
Balance 490,000 420,000 679,000
Ending balance: individually evaluated for impairment   0 0
Ending balance: collectively evaluated for impairment   420,000 679,000
Ending balance   43,239,000 [1] 55,055,000 [2]
Ending balance: individually evaluated for impairment   0 [1] 0 [2]
Ending balance: collectively evaluated for impairment   43,239,000 [1] 55,055,000 [2]
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]      
Financing Receivable, Allowance for Credit Loss, Ending Balance (43,000)    
Balance (43,000)    
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]      
Balance 6,045,000 8,246,000 6,291,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 5,914,000 6,045,000 8,246,000
Provision for credit losses 378,000 (3,308,000) 1,881,000
Charge-offs (38,000) (12,000) (235,000)
Recoveries 89,000 1,119,000 309,000
Balance 5,914,000 6,045,000 8,246,000
Ending balance: individually evaluated for impairment   84,000 77,000
Ending balance: collectively evaluated for impairment   5,961,000 8,169,000
Ending balance   565,758,000 [1] 529,953,000 [2]
Ending balance: individually evaluated for impairment   10,435,000 [1] 15,327,000 [2]
Ending balance: collectively evaluated for impairment   555,323,000 [1] 514,626,000 [2]
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Loss, Ending Balance (560,000)    
Balance (560,000)    
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]      
Balance 13,301,000 13,611,000 6,761,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 10,164,000 13,301,000 13,611,000
Provision for credit losses (603,000) (310,000) 6,837,000
Charge-offs 0 0 0
Recoveries 0 0 13,000
Balance 10,164,000 13,301,000 13,611,000
Ending balance: individually evaluated for impairment   0 8,000
Ending balance: collectively evaluated for impairment   13,301,000 13,603,000
Ending balance   1,027,415,000 [1] 917,436,000 [2]
Ending balance: individually evaluated for impairment   146,000 [1] 503,000 [2]
Ending balance: collectively evaluated for impairment   1,027,269,000 [1] 916,933,000 [2]
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Loss, Ending Balance (2,534,000)    
Balance (2,534,000)    
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]      
Balance 1,695,000 1,819,000 893,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 1,269,000 1,695,000 1,819,000
Provision for credit losses 152,000 (150,000) 907,000
Charge-offs 0 0 (18,000)
Recoveries 43,000 26,000 37,000
Balance 1,269,000 1,695,000 1,819,000
Ending balance: individually evaluated for impairment   4,000 0
Ending balance: collectively evaluated for impairment   1,691,000 1,819,000
Ending balance   176,593,000 [1] 146,095,000 [2]
Ending balance: individually evaluated for impairment   91,000 [1] 0 [2]
Ending balance: collectively evaluated for impairment   176,502,000 [1] 146,095,000 [2]
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]      
Financing Receivable, Allowance for Credit Loss, Ending Balance (621,000)    
Balance (621,000)    
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]      
Balance 2,449,000 3,240,000 1,888,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 14,027,000 2,449,000 3,240,000
Provision for credit losses 5,621,000 (1,629,000) 1,168,000
Charge-offs (33,000) (92,000) (129,000)
Recoveries 595,000 930,000 313,000
Balance 14,027,000 2,449,000 3,240,000
Ending balance: individually evaluated for impairment   69,000 172,000
Ending balance: collectively evaluated for impairment   2,380,000 3,068,000
Ending balance   442,547,000 [1] 337,888,000 [2]
Ending balance: individually evaluated for impairment   2,437,000 [1] 3,273,000 [2]
Ending balance: collectively evaluated for impairment   440,110,000 [1] 334,615,000 [2]
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Loss, Ending Balance 5,395,000    
Balance 5,395,000    
Retail Portfolio Segment [Member] | Home Equity and Other [Member]      
Balance 626,000 889,000 861,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 160,000 626,000 889,000
Provision for credit losses (111,000) (301,000) 58,000
Charge-offs (21,000) (43,000) (96,000)
Recoveries 77,000 81,000 66,000
Balance 160,000 626,000 889,000
Ending balance: individually evaluated for impairment   123,000 241,000
Ending balance: collectively evaluated for impairment   503,000 648,000
Ending balance   60,488,000 [1] 61,620,000 [2]
Ending balance: individually evaluated for impairment   1,247,000 [1] 1,270,000 [2]
Ending balance: collectively evaluated for impairment   59,241,000 [1] 60,350,000 [2]
Retail Portfolio Segment [Member] | Home Equity and Other [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Loss, Ending Balance (411,000)    
Balance (411,000)    
Unallocated Financing Receivables [Member]      
Balance 45,000 59,000 70,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 19,000 45,000 59,000
Provision for credit losses 29,000 (14,000) (11,000)
Charge-offs 0 0 0
Recoveries 0 0 0
Balance 19,000 45,000 59,000
Ending balance: individually evaluated for impairment   0 0
Ending balance: collectively evaluated for impairment   $ 45,000 $ 59,000
Unallocated Financing Receivables [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Loss, Ending Balance (55,000)    
Balance $ (55,000)    
[1] Excludes $40.1 million in loans originated under the Paycheck Protection Program.
[2] Excludes $365 million in loans originated under the Paycheck Protection Program.