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Note 4 - Loans Receivable and Allowance for Loan and Lease Losses - Loan Portfolio (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Allowance for loan and lease losses | $ (7,823) |  | $ (7,609) | $ (6,485) | $ (6,297)
Loans receivable, net | 780,713 |  | 772,767 |  |
Business Activities Loans [Member] |  |  |  |  |
Loans receivable, gross | 788,536 | [1] | 780,376 |  |
Allowance for loan and lease losses | (7,823) |  | (7,609) |  |
Loans receivable, net | 780,713 |  |  |  |
Acquired Loans [Member] |  |  |  |  |
Loans receivable, gross |  |  | 780,376 |  |
Allowance for loan and lease losses |  |  | (7,609) |  |
Loans receivable, net |  |  | 772,767 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Allowance for loan and lease losses | (1,862) |  | (1,866) | (2,480) | (2,212)
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Loans receivable, gross | 291,556 |  | 274,938 |  |
Allowance for loan and lease losses | (1,862) |  | (1,866) |  |
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |
Loans receivable, gross |  |  | 274,938 |  |
Residential Portfolio Segment [Member] |  |  |  |  |
Allowance for loan and lease losses | (1,389) |  | (1,059) | (1,073) | (959)
Residential Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Loans receivable, gross | 159,985 |  | 157,300 |  |
Allowance for loan and lease losses | (1,389) |  | (1,059) |  |
Residential Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |
Loans receivable, gross |  |  | 157,300 |  |
Commercial Portfolio Segment [Member] |  |  |  |  |
Allowance for loan and lease losses | (3,490) |  | (3,558) | (1,759) | (2,023)
Commercial Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Loans receivable, gross | 177,866 |  | 191,852 |  |
Allowance for loan and lease losses | (3,490) |  | (3,558) |  |
Commercial Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |
Loans receivable, gross |  |  | 191,852 |  |
Consumer Portfolio Segment [Member] |  |  |  |  |
Allowance for loan and lease losses | (592) |  | (641) | (546) | (568)
Consumer Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Loans receivable, gross | 95,755 |  | 94,569 |  |
Allowance for loan and lease losses | (592) |  | (641) |  |
Consumer Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |
Loans receivable, gross |  |  | 94,569 |  |
Construction Portfolio Segment [Member] |  |  |  |  |
Allowance for loan and lease losses | (355) |  | (350) | (488) | (481)
Construction Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Loans receivable, gross | 45,356 |  | 46,040 |  |
Allowance for loan and lease losses | (355) |  | (350) |  |
Construction Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |
Loans receivable, gross |  |  | 46,040 |  |
Construction to Permanent Portfolio Segment [Member] |  |  |  |  |
Allowance for loan and lease losses | (123) |  | (108) | $ (61) | $ (54)
Construction to Permanent Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Loans receivable, gross | 18,018 |  | 15,677 |  |
Allowance for loan and lease losses | $ (123) |  | (108) |  |
Construction to Permanent Portfolio Segment [Member] | Acquired Loans [Member] |  |  |  |  |
Loans receivable, gross |  |  | $ 15,677 |  |
[1] |

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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=118936363&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=118939070&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=118936363&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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