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Note 5 - Loans and Allowance for Loan Losses (Details Textual) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loans and Leases Receivable, Gross |  | $ 10,780,000,000 | $ 5,630,000,000 |
Impaired Financing Receivable, Recorded Investment |  | 43,923,000 | 43,696,000 |
Impaired Financing Receivable, Related Allowance |  | 338,000 | 680,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 1,780,000 | 1,593,000 | $ 1,200,000
Impaired Financing Receivable, Average Recorded Investment |  | $ 50,788,000 | $ 35,978,000 | 16,700,000
Financing Receivable, Modifications, Number of Contracts |  | 16 | 70 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 11,001,000 | $ 13,907,000 |
Financing Receivable, Specific Reserve |  | 26,000 | 402,000 |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans |  | 33,000 |  |
Mortgage Loans in Process of Foreclosure, Amount |  | 5,057,000 | 1,714,000 |
Real Estate Acquired Through Foreclosure |  | 32,118,000 | 26,895,000 |
Loans and Leases Receivable Classified |  | 76,300,000 | 47,800,000 |
Covered Purchased Impaired Loans Allowance |  | 418,000 | 954,000 | 954,000
Provision for Loan Losses Net of FDIC Loss Share Adjustments |  |  |  | 400,000
Non Covered Impaired Loans Allowance Reclassified |  |  |  | 954,000
Provision for Loan and Lease Losses |  | 26,393,000 | 20,065,000 | 9,022,000
Loans and Leases Receivable, Allowance |  | 41,668,000 | 36,286,000 |
Risk Ratings 6,7, and 8 [Member] |  |  |  |
Loans and Leases Receivable Classified |  | 175,600,000 | 166,000,000 |
Substandard [Member] |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 17,100,000 | 17,800,000 |
OREO Secured by Residential Real Estate Properties [Member] |  |  |  |
Real Estate Acquired Through Foreclosure |  | 3,828,000 | 5,094,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | 4,239,612,000 | 3,028,079,000 |
Impaired Financing Receivable, Recorded Investment |  | 31,538,000 | 30,001,000 |
Impaired Financing Receivable, Related Allowance |  | 338,000 | 417,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 1,175,000 | 1,274,000 |
Impaired Financing Receivable, Average Recorded Investment |  | $ 34,239,000 | $ 28,854,000 |
Financing Receivable, Modifications, Number of Contracts |  | 5 | 51 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 8,310,000 | $ 11,861,000 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 1 |  |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | $ 440,000 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | 1,094,633,000 | 904,245,000 |
Impaired Financing Receivable, Recorded Investment |  | 13,431,000 | 12,383,000 |
Impaired Financing Receivable, Related Allowance |  | 53,000 | 162,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 443,000 | 419,000 |
Impaired Financing Receivable, Average Recorded Investment |  | $ 12,904,000 | $ 9,486,000 |
Financing Receivable, Modifications, Number of Contracts |  | 1 | 23 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 139,000 | $ 1,570,000 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  | 1 | 1 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down |  |  | $ 31,000 |
Real Estate Owned, Transfer to Real Estate Owned |  |  | 69,000 |
Consumer Portfolio Segment [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | $ 465,516,000 | 488,563,000 |
Impaired Financing Receivable, Recorded Investment |  | 4,775,000 | 2,173,000 |
Impaired Financing Receivable, Related Allowance |  |  | 1,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 153,000 | 67,000 |
Impaired Financing Receivable, Average Recorded Investment |  | $ 3,357,000 | $ 1,412,000 |
Financing Receivable, Modifications, Number of Contracts |  |  | 2 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  | $ 50,000 |
Consumer Portfolio Segment [Member] | Consumer Loans [Member] |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  |  | 1 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down |  |  | $ 39,000 |
Restructured Loan [Member] |  |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 13 | 15 |
Proceeds from Collection of Loans Receivable |  | $ 1.20 | $ 3,700,000 |
Commercial Real Estate and Residential Real Estate [Member] | OREO Received in Full or Partial Satisfaction of Loans [Member] |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | 0 | 236,000 |
Acquired Loans [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | 5,074,076,000 | 1,305,683,000 |
Non Covered Impaired Loans Allowance Reclassified |  | 418,000 | 954,000 |
Provision for Loan and Lease Losses |  | 1,866,000 | 626,000 |
Allowance for Loan and Lease Losses, Write-offs |  | 2,400,000 | 626,000 |
Loans and Leases Receivable, Allowance, Covered |  | 418,000 | 954,000 | 954,000
Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | 3,818,037,000 | 1,170,871,000 |
Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | 793,228,000 | 423,176,000 |
Acquired Loans [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | 51,467,000 | 49,677,000 |
Loans, Including Acquired Loans [Member] |  |  |  |
Loans and Leases Receivable, Allowance |  | $ 42,086,000 | $ 37,240,000 | $ 32,305,000

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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 recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + 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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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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