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Note 4 - Loans and Allowance for Loan Losses (Details Textual) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Loans and Leases Receivable, Gross |  | $ 5,630,000,000 | $ 4,920,000,000 |
Impaired Financing Receivable, Recorded Investment |  | 43,696,000 | 18,190,000 |
Impaired Financing Receivable, Related Allowance |  | 680,000 | 2,831,000 |
Impaired Financing Receivable, Interest Income, Accrual Method | $ 1,200,000 | 1,593,000 | 1,200,000 | $ 800,000
Impaired Financing Receivable, Average Recorded Investment | 16,675,000 | $ 35,978,000 | $ 16,700,000 | 17,500,000
Financing Receivable, Modifications, Number of Contracts |  | 70 | 18 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 13,907,000 | $ 2,636,000 |
Loans and Leases Receivable, Allowance, Covered |  | 402,000 | $ 113,000 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  |  | 0 |
Mortgage Loans in Process of Foreclosure, Amount |  | 1,714,000 | $ 1,064,000 |
Real Estate Acquired Through Foreclosure |  | 26,895,000 | 44,820,000 |
Loans and Leases Receivable Classified |  | 47,800,000 | 49,900,000 |
Covered Purchased Impaired Loans Allowance |  |  |  | 954,000
Provision for Loan Losses Net of FDIC Loss Share Adjustments |  |  |  | 400,000
Non Covered Impaired Loans Allowance Reclassified |  | 954,000 | 954,000 | 954,000
Provision for Loan and Lease Losses |  | 20,065,000 | 9,022,000 | 7,245,000
Loans and Leases Receivable, Allowance |  | 36,286,000 | 31,351,000 |
Risk Ratings 6,7, and 8 [Member] |  |  |  |
Loans and Leases Receivable Classified |  | 166,000,000 | 153,700,000 |
Substandard [Member] |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 17,800,000 | 23,500,000 |
OREO Secured by Residential Real Estate Properties [Member] |  |  |  |
Real Estate Acquired Through Foreclosure |  | 5,094,000 | 5,916,000 |
Consumer Portfolio Segment [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | 488,563,000 | 385,668,000 |
Impaired Financing Receivable, Recorded Investment |  | 2,173,000 | 921,000 |
Impaired Financing Receivable, Related Allowance |  | 1,000 | $ 92,000 |
Impaired Financing Receivable, Interest Income, Accrual Method | 70,000 | 67,000 |  |
Impaired Financing Receivable, Average Recorded Investment | 973,000 | $ 1,412,000 |  |
Financing Receivable, Modifications, Number of Contracts |  | 2 | 1 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 50,000 | $ 13,000 |
Consumer Portfolio Segment [Member] | Consumer Loans [Member] |  |  |  |
Loans and Leases Receivable, Allowance, Covered |  | $ 39,000 |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  | 1 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | $ 3,028,079,000 | 2,204,992,000 |
Impaired Financing Receivable, Recorded Investment |  | 30,001,000 | 15,017,000 |
Impaired Financing Receivable, Related Allowance |  | 417,000 | $ 2,307,000 |
Impaired Financing Receivable, Interest Income, Accrual Method | 987,000 | 1,274,000 |  |
Impaired Financing Receivable, Average Recorded Investment | 13,712,000 | $ 28,854,000 |  |
Financing Receivable, Modifications, Number of Contracts |  | 51 | 12 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 11,861,000 | $ 2,276,000 |
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | 904,245,000 | 696,180,000 |
Impaired Financing Receivable, Recorded Investment |  | 12,383,000 | 5,647,000 |
Impaired Financing Receivable, Related Allowance |  | 162,000 | $ 1,034,000 |
Impaired Financing Receivable, Interest Income, Accrual Method | 370,000 | 419,000 |  |
Impaired Financing Receivable, Average Recorded Investment | $ 5,148,000 | $ 9,486,000 |  |
Financing Receivable, Modifications, Number of Contracts |  | 23 | 11 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 1,570,000 | $ 1,179,000 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  | 1 |  |
Financing Receivable, Modifications, Subsequent Default, Charge Off |  | $ 31,000 |  |
Real Estate Owned, Transfer to Real Estate Owned |  | $ 69,000 |  |
Restructured Loan [Member] |  |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 15 |  |
Proceeds from Collection of Loans Receivable |  | $ 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 |  | 236,000 | 167,000 |
Acquired Loans [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | 1,305,683,000 | 1,672,901,000 |
Loans and Leases Receivable, Allowance, Covered |  | 954,000 | 954,000 | 954,000
Non Covered Impaired Loans Allowance Reclassified |  | 954,000 | 954,000 |
Provision for Loan and Lease Losses |  | 626,000 | 736,000 |
Allowance for Loan and Lease Losses, Write-offs |  | 626,000 |  |
Loans and Leases Receivable, Allowance |  | 0 |  |
Acquired Loans [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | 49,677,000 | 75,606,000 |
Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | 1,170,871,000 | 1,432,189,000 |
Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |  |  |
Loans and Leases Receivable, Gross |  | 423,176,000 | 501,002,000 |
Loans, Including Acquired Loans [Member] |  |  |  |
Loans and Leases Receivable, Allowance |  | $ 37,240,000 | $ 32,305,000 | $ 29,982,000

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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=65884687&loc=d3e4428-111522 + Details
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