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Note 4 - 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
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Balance, beginning of year | $ 31,351,000 |  |  |  |  |
Provision for loan losses | 20,065,000 |  | $ 9,022,000 |  | $ 7,245,000 |
Balance, end of year | 36,286,000 |  | 31,351,000 |  |  |
Loans, Excluding Acquired Loans [Member] |  |  |  |  |  |
Balance, beginning of year | 31,351,000 | [1] | 29,028,000 | [1] | 27,442,000 |
Provision for loan losses | 19,439,000 | [2] | 8,286,000 | [2] | 6,882,000 |
Charge-offs | (16,643,000) |  | (7,774,000) |  | (8,554,000) |
Recoveries | 2,139,000 |  | 1,811,000 |  | 3,258,000 |
Net charge-offs | (14,504,000) |  | (5,963,000) |  | (5,296,000) |
Balance, end of year | 36,286,000 | [2] | 31,351,000 | [1] | 29,028,000 | [1]
Loans individually evaluated for impairment | 680,000 |  | 2,831,000 |  |  |
Loans collectively evaluated for impairment | 35,606,000 |  | 28,520,000 |  |  |
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Balance, beginning of year | 5,985,000 | [1] | 6,962,000 | [1] | 3,205,000 |
Provision for loan losses | 5,345,000 | [2] | 258,000 | [2] | 4,475,000 |
Charge-offs | (3,956,000) |  | (1,415,000) |  | (1,044,000) |
Recoveries | 365,000 |  | 180,000 |  | 326,000 |
Net charge-offs | (3,591,000) |  | (1,235,000) |  | (718,000) |
Balance, end of year | 7,739,000 | [2] | 5,985,000 | [1] | 6,962,000 | [1]
Loans individually evaluated for impairment | 262,000 |  | 432,000 |  |  |
Loans collectively evaluated for impairment | 7,477,000 |  | 5,553,000 |  |  |
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Balance, beginning of year | 19,522,000 | [1] | 15,161,000 | [1] | 16,885,000 |
Provision for loan losses | 9,461,000 | [2] | 5,738,000 | [2] | (606,000) |
Charge-offs | (7,517,000) |  | (1,580,000) |  | (2,684,000) |
Recoveries | 351,000 |  | 203,000 |  | 1,566,000 |
Net charge-offs | (7,166,000) |  | (1,377,000) |  | (1,118,000) |
Balance, end of year | 21,817,000 | [2] | 19,522,000 | [1] | 15,161,000 | [1]
Loans individually evaluated for impairment | 417,000 |  | 2,307,000 |  |  |
Loans collectively evaluated for impairment | 21,400,000 |  | 17,215,000 |  |  |
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Balance, beginning of year | 3,893,000 | [1] | 5,445,000 | [1] | 5,430,000 |
Provision for loan losses | 2,174,000 | [2] | 665,000 | [2] | 2,307,000 |
Charge-offs | (3,195,000) |  | (3,107,000) |  | (3,188,000) |
Recoveries | 907,000 |  | 890,000 |  | 896,000 |
Net charge-offs | (2,288,000) |  | (2,217,000) |  | (2,292,000) |
Balance, end of year | 3,779,000 | [2] | 3,893,000 | [1] | 5,445,000 | [1]
Loans individually evaluated for impairment |  |  | 7,000 |  |  |
Loans collectively evaluated for impairment | 3,779,000 |  | 3,886,000 |  |  |
Loans, Excluding Acquired Loans [Member] | Unallocated Financing Receivables [Member] |  |  |  |  |  |
Balance, beginning of year | 1,951,000 | [1] | 1,460,000 | [1] | 1,922,000 |
Provision for loan losses | 2,459,000 | [2] | 1,625,000 | [2] | 706,000 |
Charge-offs | (1,975,000) |  | (1,672,000) |  | (1,638,000) |
Recoveries | 516,000 |  | 538,000 |  | 470,000 |
Net charge-offs | (1,459,000) |  | (1,134,000) |  | (1,168,000) |
Balance, end of year | 2,951,000 | [2] | 1,951,000 | [1] | $ 1,460,000 | [1]
Loans individually evaluated for impairment | 1,000 |  | 85,000 |  |  |
Loans collectively evaluated for impairment | $ 2,950,000 |  | $ 1,866,000 |  |  |
[1] | Allowance for loan losses at December 31, 2016, 2015 and 2014 includes $954,000 allowance for loans acquired (not shown in the table above). The total allowance for loan losses at December 31, 2016, 2015 and 2014 was $37,240,000, $32,305,000 and $29,982,000, respectively.
[2] | 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. Provision for loan losses of $736,000 attributable to acquired loans, covered by FDIC loss share, was excluded from this table for the year ended December 31, 2015 (total provision for loan losses for the year ended December 31, 2015 is $9,022,000).

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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=66008989&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 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=66008989&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=66008989&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=6379141&loc=d3e15032-111544 + Details
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