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Note D - Loans and Allowance for Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Balance | $ 7,699 | $ 6,648 | $ 8,334
Provision for loan losses | 2,564 | 2,826 | 1,090
Loans charged off | (4,081) | (3,203) | (4,251)
Recoveries | 1,317 | 1,428 | 1,475
Balance | 7,499 | 7,699 | 6,648
Residential Portfolio Segment [Member] |  |  |
Balance | 939 | 1,087 | 1,426
Provision for loan losses | 1,016 | (63) | 103
Loans charged off | (745) | (384) | (828)
Recoveries | 260 | 299 | 386
Balance | 1,470 | 939 | 1,087
Commercial Real Estate Portfolio Segment [Member] |  |  |
Balance | 4,315 | 1,959 | 4,195
Provision for loan losses | (632) | 2,287 | (469)
Loans charged off | (1,067) | (63) | (1,971)
Recoveries | 362 | 132 | 204
Balance | 2,978 | 4,315 | 1,959
Commercial and Industrial Portfolio Segment [Member] |  |  |
Balance | 907 | 2,589 | 1,602
Provision for loan losses | 658 | (1,112) | 777
Loans charged off | (627) | (586) | (24)
Recoveries | 86 | 16 | 234
Balance | 1,024 | 907 | 2,589
Consumer Portfolio Segment [Member] |  |  |
Balance | 1,538 | 1,013 | 1,111
Provision for loan losses | 1,522 | 1,714 | 679
Loans charged off | (1,642) | (2,170) | (1,428)
Recoveries | 609 | 981 | 651
Balance | $ 2,027 | $ 1,538 | $ 1,013

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + 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=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + 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)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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