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Note 5 - Loans and Allowance for Loan Losses (Details Textual) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loans and Leases Receivable, Gross | $ 6,303,000,000 |  | $ 6,303,000,000 |  |  | $ 5,633,000,000 |  |
Impaired Financing Receivable, Recorded Investment | 51,809,000 |  | 51,809,000 |  |  | 43,696,000 |  |
Impaired Financing Receivable, Related Allowance | 6,321,000 |  | 6,321,000 |  |  | 680,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 350,000 | $ 430,000 | 1,050,000 | $ 1,230,000 |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | $ 54,468,000 | $ 42,121,000 | $ 52,504,000 | $ 34,048,000 |  |  |  |
Financing Receivable, Modifications, Number of Contracts | 1 | 21 | 13 | 67 |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 608,000 | $ 3,011,000 | $ 9,237,000 | $ 13,372,000 |  |  |  |
Financing Receivable, Specific Reserve | 0 |  | 33,000 | 402,000 |  |  |  |
Mortgage Loans in Process of Foreclosure, Amount | 1,180,000 |  | 1,180,000 |  |  | 1,714,000 |  |
Real Estate Acquired Through Foreclosure | 31,477,000 |  | 31,477,000 |  |  | 26,895,000 |  |
Loans and Leases Receivable Classified | 22,600,000 |  | 22,600,000 |  |  | 47,800,000 |  |
Provision for Loan and Lease Losses | 5,462,000 | 8,294,000 | 16,792,000 | 15,733,000 |  |  |  |
Loans and Leases Receivable, Allowance | 42,717,000 |  | 42,717,000 |  |  | 36,286,000 |  |
Risk Ratings 6,7, and 8 [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Classified | 130,600,000 |  | 130,600,000 |  |  | 166,000,000 |  |
Substandard [Member] |  |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net | 7,900,000 |  | 7,900,000 |  |  | 17,800,000 |  |
OREO Secured by Residential Real Estate Properties [Member] |  |  |  |  |  |  |  |
Real Estate Acquired Through Foreclosure | 5,275,000 |  | 5,275,000 |  |  | 5,094,000 |  |
Acquired Loans [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | 1,092,039,000 |  | 1,092,039,000 |  |  | 1,305,683,000 |  |
Provision for Loan and Lease Losses | 0 | 215,000 | 1,464,000 | 522,000 |  |  |  |
Allowance for Loan and Lease Losses, Write-offs |  | 215,000 | 2,000,000 | 522,000 |  |  |  |
Loans and Leases Receivable, Allowance, Covered | 391,000 | 954,000 | 391,000 | 954,000 |  | 954,000 | $ 954,000 | $ 954,000
Loans, Including Acquired Loans [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 43,108,000 | 35,048,000 | 43,108,000 | 35,048,000 | $ 41,770,000 | 37,240,000 | $ 34,477,000 | $ 32,305,000
OREO Received in Full or Partial Satisfaction of Loans [Member] | Commercial Real Estate and Residential Real Estate [Member] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  | 117,000 | 166,500 |  |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | 3,794,900,000 |  | 3,794,900,000 |  |  | 3,028,079,000 |  |
Impaired Financing Receivable, Recorded Investment | 33,680,000 |  | 33,680,000 |  |  | 30,001,000 |  |
Impaired Financing Receivable, Related Allowance | 2,325,000 |  | 2,325,000 |  |  | 417,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 223,000 | 341,000 | 687,000 | 1,034,000 |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 34,766,000 | $ 34,352,000 | $ 34,913,000 | $ 28,567,000 |  |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 15 | 3 | 49 |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 1,577,000 | $ 7,818,000 | $ 11,335,000 |  |  |  |
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] | Acquired Loans [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | 978,309,000 |  | 978,309,000 |  |  | 1,170,871,000 |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | 494,262,000 |  | 494,262,000 |  |  | 488,563,000 |  |
Impaired Financing Receivable, Recorded Investment | 4,153,000 |  | 4,153,000 |  |  | 2,173,000 |  |
Impaired Financing Receivable, Related Allowance |  |  |  |  |  | 1,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 35,000 | 14,000 | 76,000 | 42,000 |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3,597,000 | $ 1,763,000 | 3,003,000 | $ 1,222,000 |  |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 1 |  | 2 |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 47,000 |  | $ 50,000 |  |  |  |
Consumer Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 29,662,000 |  | $ 29,662,000 |  |  | $ 49,677,000 |  |
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 |  |  |  |

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