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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Provision for loan losses $ 700,000 $ 750,000 $ 700,000 $ 1,350,000  
Ending balance 2,636,856,000   2,636,856,000   $ 2,558,552,000
Originated Loan [Member]          
Beginning balance 19,081,000 18,126,000 19,133,000 17,868,000  
Provision for loan losses 914,000 562,000 132,000 1,110,000  
Charge-offs (274,000) (1,150,000) (666,000) (1,595,000)  
Recoveries 761,000 417,000 1,883,000 572,000  
Ending balance 20,482,000 17,955,000 20,482,000 17,955,000  
Ending balance: individually evaluated for impairment 674,000 2,799,000 674,000 2,799,000  
Ending balance: collectively evaluated for impairment 19,808,000 15,156,000 19,808,000 15,156,000  
Ending balance: individually evaluated for impairment 6,658,000   6,658,000   8,787,000
Ending balance: collectively evaluated for impairment 2,289,546,000   2,289,546,000   2,161,170,000
Ending balance 2,296,204,000   2,296,204,000   2,169,957,000
Acquired Loan [Member]          
Beginning balance 893,000 150,000 368,000 93,000  
Provision for loan losses (214,000) 188,000 568,000 240,000  
Charge-offs 0 0 (261,000) (11,000)  
Recoveries 6,000 2,000 10,000 18,000  
Ending balance 685,000 340,000 685,000 340,000  
Ending balance 340,652,000   340,652,000   388,595,000
Commercial Portfolio Segment [Member]          
Ending balance 2,261,970,000   2,261,970,000   2,203,568,000
Commercial Portfolio Segment [Member] | Originated Loan [Member]          
Beginning balance 16,865,000 15,671,000 16,456,000 16,026,000  
Provision for loan losses 892,000 372,000 551,000 147,000  
Charge-offs (85,000) (1,006,000) (342,000) (1,231,000)  
Recoveries 654,000 326,000 1,661,000 421,000  
Ending balance 18,326,000 15,363,000 18,326,000 15,363,000  
Ending balance: individually evaluated for impairment 391,000 2,044,000 391,000 2,044,000  
Ending balance: collectively evaluated for impairment 17,935,000 13,319,000 17,935,000 13,319,000  
Ending balance: individually evaluated for impairment 4,812,000   4,812,000   6,394,000
Ending balance: collectively evaluated for impairment 2,022,381,000   2,022,381,000   1,927,834,000
Ending balance 2,027,193,000   2,027,193,000   1,934,228,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member]          
Beginning balance 359,000 125,000 291,000 75,000  
Provision for loan losses (254,000) 197,000 60,000 242,000  
Charge-offs 0 0 (246,000) (11,000)  
Recoveries 0 2,000 0 18,000  
Ending balance 105,000 324,000 105,000 324,000  
Ending balance 234,777,000   234,777,000   269,340,000
Retail Portfolio Segment [Member]          
Ending balance 374,886,000   374,886,000   354,984,000
Retail Portfolio Segment [Member] | Originated Loan [Member]          
Beginning balance 2,001,000 2,365,000 2,584,000 1,882,000  
Provision for loan losses 297,000 121,000 (266,000) 764,000  
Charge-offs (189,000) (144,000) (324,000) (364,000)  
Recoveries 107,000 91,000 222,000 151,000  
Ending balance 2,216,000 2,433,000 2,216,000 2,433,000  
Ending balance: individually evaluated for impairment 283,000 755,000 283,000 755,000  
Ending balance: collectively evaluated for impairment 1,933,000 1,678,000 1,933,000 1,678,000  
Ending balance: individually evaluated for impairment 1,846,000   1,846,000   2,393,000
Ending balance: collectively evaluated for impairment 267,165,000   267,165,000   233,336,000
Ending balance 269,011,000   269,011,000   235,729,000
Retail Portfolio Segment [Member] | Acquired Loan [Member]          
Beginning balance 534,000 25,000 77,000 18,000  
Provision for loan losses 40,000 (9,000) 508,000 (2,000)  
Charge-offs 0 0 (15,000) 0  
Recoveries 6,000 0 10,000 0  
Ending balance 580,000 16,000 580,000 16,000  
Ending balance 105,875,000   105,875,000   $ 119,255,000
Unallocated Financing Receivables [Member] | Originated Loan [Member]          
Beginning balance 215,000 90,000 93,000 (40,000)  
Provision for loan losses (275,000) 69,000 (153,000) 199,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Ending balance (60,000) 159,000 (60,000) 159,000  
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment (60,000) 159,000 (60,000) 159,000  
Unallocated Financing Receivables [Member] | Acquired Loan [Member]          
Beginning balance 0 0 0 0  
Provision for loan losses 0 0 0 0  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Ending balance $ 0 $ 0 $ 0 $ 0