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Note 5 - Loans and Allowance for Loan Losses - Activity in the Allowance for Loan Losses, by Portfolio Segment, for the Current Year (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Balance, beginning of period |  | $ 36,286,000 |  |  |  |
Provision for loan losses |  | 26,393,000 |  | $ 20,065,000 |  | $ 9,022,000
Balance, end of period |  | 41,668,000 |  | 36,286,000 |  |
Loans, Excluding Acquired Loans [Member] |  |  |  |  |  |
Balance, beginning of period |  | 36,286,000 | [1] | 31,351,000 | [1] | 29,028,000
Provision for loan losses |  | 24,527,000 | [2] | 19,439,000 | [2] | 8,286,000
Charge-offs |  | (23,498,000) |  | (16,643,000) |  | (7,774,000)
Recoveries |  | 4,353,000 |  | 2,139,000 |  | 1,811,000
Net charge-offs |  | (19,145,000) |  | (14,504,000) |  | (5,963,000)
Balance, end of period | [1] | 41,668,000 |  | 36,286,000 |  | 31,351,000
Loans individually evaluated for impairment |  | 338,000 |  | 680,000 |  |
Loans collectively evaluated for impairment |  | 41,330,000 |  | 35,606,000 |  |
Commercial Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] |  |  |  |  |  |
Balance, beginning of period |  | 7,739,000 | [1] | 5,985,000 | [1] | 6,962,000
Provision for loan losses |  | 7,002,000 | [2] | 5,345,000 | [2] | 258,000
Charge-offs |  | (7,837,000) |  | (3,956,000) |  | (1,415,000)
Recoveries |  | 103,000 |  | 365,000 |  | 180,000
Net charge-offs |  | (7,734,000) |  | (3,591,000) |  | (1,235,000)
Balance, end of period | [1] | 7,007,000 |  | 7,739,000 |  | 5,985,000
Loans individually evaluated for impairment |  |  |  | 262,000 |  |
Loans collectively evaluated for impairment |  | 7,007,000 |  | 7,477,000 |  |
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] |  |  |  |  |  |
Balance, beginning of period |  | 21,817,000 | [1] | 19,522,000 | [1] | 15,161,000
Provision for loan losses |  | 12,463,000 | [2] | 9,461,000 | [2] | 5,738,000
Charge-offs |  | (7,989,000) |  | (7,517,000) |  | (1,580,000)
Recoveries |  | 990,000 |  | 351,000 |  | 203,000
Net charge-offs |  | (6,999,000) |  | (7,166,000) |  | (1,377,000)
Balance, end of period | [1] | 27,281,000 |  | 21,817,000 |  | 19,522,000
Loans individually evaluated for impairment |  | 338,000 |  | 417,000 |  |
Loans collectively evaluated for impairment |  | 26,943,000 |  | 21,400,000 |  |
Consumer Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] |  |  |  |  |  |
Balance, beginning of period |  | 3,779,000 | [1] | 3,893,000 | [1] | 5,445,000
Provision for loan losses |  | 2,889,000 | [2] | 2,174,000 | [2] | 665,000
Charge-offs |  | (3,905,000) |  | (3,195,000) |  | (3,107,000)
Recoveries |  | 1,021,000 |  | 907,000 |  | 890,000
Net charge-offs |  | (2,884,000) |  | (2,288,000) |  | (2,217,000)
Balance, end of period | [1] | 3,784,000 |  | 3,779,000 |  | 3,893,000
Loans individually evaluated for impairment |  |  |  |  |  |
Loans collectively evaluated for impairment |  | 3,784,000 |  | 3,779,000 |  |
Unallocated Financing Receivables [Member] | Loans, Excluding Acquired Loans [Member] |  |  |  |  |  |
Balance, beginning of period |  | 2,951,000 | [1] | 1,951,000 | [1] | 1,460,000
Provision for loan losses |  | 2,173,000 | [2] | 2,459,000 | [2] | 1,625,000
Charge-offs |  | (3,767,000) |  | (1,975,000) |  | (1,672,000)
Recoveries |  | 2,239,000 |  | 516,000 |  | 538,000
Net charge-offs |  | (1,528,000) |  | (1,459,000) |  | (1,134,000)
Balance, end of period | [1] | 3,596,000 |  | 2,951,000 |  | $ 1,951,000
Loans individually evaluated for impairment |  |  |  | 1,000 |  |
Loans collectively evaluated for impairment |  | $ 3,596,000 |  | $ 2,950,000 |  |
[1] | Allowance for loan losses at December 31, 2017 includes $418,000 allowance for loans acquired (not shown in the table above). Allowance for loan losses at December 31, 2016 and 2015 includes $954,000 allowance for loans acquired. The total allowance for loan losses at December 31, 2017, 2016 and 2015 was $42,086,000, $37,240,000 and $32,305,000, respectively.
[2] | Provision for loan losses of $1,866,000 attributable to loans acquired was excluded from this table for the year ended December 31, 2017 (total provision for loan losses for the year ended December 31, 2017 was $26,393,000). There was $2.4 million in charge-offs for loans acquired during the year ended December 31, 2017 resulting in an ending balance in the allowance related to loans acquired of $418,000. Provision for loan losses of $626,000 attributable to loans acquired was excluded from this table for the year ended December 31, 2016 (total provision for loan losses for the year ended December 31, 2016 was $20,065,000). The $626,000 was subsequently charged-off, resulting in no increase to the ending balance in the allowance related to loans acquired.

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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