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Note 3 - Loans and Allowance for Loan Losses - Activity in Allowance for Loan Losses and the Recorded Investments in Loans (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Beginning balance $ 24,828,000 $ 23,135,000 $ 23,889,000 $ 22,380,000  
Provision for loan losses 7,600,000 900,000 8,350,000 1,750,000  
Charge-offs (335,000) (77,000) (375,000) (252,000)  
Recoveries 153,000 95,000 382,000 175,000  
Ending balance 32,246,000 24,053,000 32,246,000 24,053,000  
Ending balance: individually evaluated for impairment 1,512,000 2,536,000 1,512,000 2,536,000  
Ending balance: collectively evaluated for impairment 30,734,000 21,517,000 30,734,000 21,517,000  
Loans and Leases Receivable, Net of Deferred Income, Total 3,333,056,000   3,333,056,000   $ 2,856,667,000
Ending balance: individually evaluated for impairment 20,240,000   20,240,000   15,056,000
Ending balance: collectively evaluated for impairment 3,312,816,000   3,312,816,000   2,841,611,000
Commercial Portfolio Segment [Member]          
Beginning balance 21,750,000 20,211,000 21,070,000 19,619,000  
Provision for loan losses 6,466,000 1,015,000 7,039,000 1,579,000  
Charge-offs (301,000) (2,000) (314,000) (2,000)  
Recoveries 47,000 47,000 167,000 75,000  
Ending balance 27,962,000 21,271,000 27,962,000 21,271,000  
Ending balance: individually evaluated for impairment 1,011,000 2,149,000 1,011,000 2,149,000  
Ending balance: collectively evaluated for impairment 26,951,000 19,122,000 26,951,000 19,122,000  
Loans and Leases Receivable, Net of Deferred Income, Total 2,901,252,000   2,901,252,000   2,441,544,000
Ending balance: individually evaluated for impairment 15,156,000   15,156,000   10,986,000
Ending balance: collectively evaluated for impairment 2,886,096,000   2,886,096,000   2,430,558,000
Retail Portfolio Segment [Member]          
Beginning balance 3,078,000 2,696,000 2,749,000 2,717,000  
Provision for loan losses 1,074,000 16,000 1,321,000 118,000  
Charge-offs (34,000) (75,000) (61,000) (250,000)  
Recoveries 106,000 48,000 215,000 100,000  
Ending balance 4,224,000 2,685,000 4,224,000 2,685,000  
Ending balance: individually evaluated for impairment 501,000 387,000 501,000 387,000  
Ending balance: collectively evaluated for impairment 3,723,000 2,298,000 3,723,000 2,298,000  
Loans and Leases Receivable, Net of Deferred Income, Total 431,804,000   431,804,000   415,123,000
Ending balance: individually evaluated for impairment 5,084,000   5,084,000   4,070,000
Ending balance: collectively evaluated for impairment 426,720,000   426,720,000   411,053,000
Unallocated Financing Receivables [Member]          
Beginning balance 0 228,000 70,000 44,000  
Provision for loan losses 60,000 (131,000) (10,000) 53,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Ending balance 60,000 97,000 60,000 97,000  
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 60,000 $ 97,000 60,000 $ 97,000  
Loans and Leases Receivable, Net of Deferred Income, Total    
Ending balance: individually evaluated for impairment    
Ending balance: collectively evaluated for impairment