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Note 5 - Loans Receivable and Allowance for Loan Losses - Loan Portfolio (Details) - USD ($) | Jun. 30, 2018 | May 10, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | --- | ---
Loans receivable, gross | $ 757,329,000 |  |  |  |  |  |  |
Allowance for loan losses | (6,525,000) |  |  | $ (6,485,000) | $ (6,297,000) | $ (5,944,000) | $ (5,697,000) | $ (4,675,000)
Loans receivable, net | 750,804,000 |  |  |  | 713,350,000 |  |  |
Business Activities Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 735,421,000 | [1] |  |  | 719,647,000 |  |  |
Allowance for loan losses | (6,525,000) |  |  |  | (6,297,000) |  |  |
Loans receivable, net | 728,896,000 |  |  |  | 713,350,000 |  |  |
Acquired Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 21,908,000 |  |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |  |  |
Loans receivable, net | 21,908,000 |  | $ 21,600,000 |  |  |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 305,426,000 |  |  |  |  |  |  |
Allowance for loan losses | (2,305,000) |  |  | (2,480,000) | (2,212,000) | (2,218,000) | (2,198,000) | (1,853,000)
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 292,508,000 |  |  |  | 299,925,000 |  |  |
Allowance for loan losses | (2,305,000) |  |  |  | (2,212,000) |  |  |
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 12,918,000 |  |  |  |  |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 146,754,000 |  |  |  |  |  |  |
Allowance for loan losses | (1,096,000) |  |  | (1,073,000) | (959,000) | (1,041,000) | (1,073,000) | (534,000)
Residential Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 146,754,000 |  |  |  | 146,377,000 |  |  |
Allowance for loan losses | (1,096,000) |  |  |  | (959,000) |  |  |
Residential Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross |  |  |  |  |  |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 170,676,000 |  |  |  |  |  |  |
Allowance for loan losses | (1,996,000) |  |  | (1,759,000) | (2,023,000) | (1,453,000) | (1,049,000) | (740,000)
Commercial Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 162,568,000 |  |  |  | 131,161,000 |  |  |
Allowance for loan losses | (1,996,000) |  |  |  | (2,023,000) |  |  |
Commercial Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 8,108,000 |  |  |  |  |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 79,264,000 |  |  |  |  |  |  |
Allowance for loan losses | (523,000) |  |  | (546,000) | (568,000) | (593,000) | (583,000) | (641,000)
Consumer Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 78,382,000 |  |  |  | 87,707,000 |  |  |
Allowance for loan losses | (523,000) |  |  |  | (568,000) |  |  |
Consumer Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 882,000 |  |  |  |  |  |  |
Construction Portfolio Segment [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 46,593,000 |  |  |  |  |  |  |
Allowance for loan losses | (499,000) |  |  | (488,000) | (481,000) | (490,000) | (591,000) | (712,000)
Construction Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 46,593,000 |  |  |  | 47,619,000 |  |  |
Allowance for loan losses | (499,000) |  |  |  | (481,000) |  |  |
Construction Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross |  |  |  |  |  |  |  |
Construction to Permanent Portfolio Segment [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 8,616,000 |  |  |  |  |  |  |
Allowance for loan losses | (80,000) |  |  | $ (61,000) | (54,000) | $ (73,000) | $ (77,000) | $ (69,000)
Construction to Permanent Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross | 8,616,000 |  |  |  | 6,858,000 |  |  |
Allowance for loan losses | (80,000) |  |  |  | $ (54,000) |  |  |
Construction to Permanent Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |  |  |  |
Loans receivable, gross |  |  |  |  |  |  |  |
[1] | The total loan receivable, gross does not include $21.9 million acquired loans which were all individually evaluated for impairment.

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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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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