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Note D - Loans and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for Loan Losses Allocated | $ 94 | $ 2,981 | $ 2,164
Unpaid principal balance | 19,917 | 25,176 | 20,180
Recorded investment | 18,108 | 22,709 | 17,228
Average impaired loans | 15,958 | 19,893 | 15,894
Interest income recognized | 855 | 1,145 | 700
Cash basis interest recognized | 855 | 1,145 | 700
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] |  |  |
Unpaid principal balance - with allowance recorded | 372 | 384 | 396
Recorded investment - with allowance recorded | 372 | 384 | 396
Allowance for Loan Losses Allocated | 94 | 100 | 107
Average impaired loans - with allowance recorded | 378 | 390 | 402
Interest income recognized - with allowance recorded | 17 | 19 | 75
Cash basis interest recognized - with allowance recorded | 17 | 19 | 75
Unpaid principal balance - with no allowance recorded | 4,989 | 5,078 | 5,178
Recorded investment - with no allowance recorded | 3,534 | 3,632 | 2,773
Average impaired loans - with no allowance recorded | 3,521 | 3,572 | 3,439
Interest income recognized - with no allowance recorded | 81 | 79 | 49
Cash basis interest recognized - with no allowance recorded | 81 | 79 | 49
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |
Unpaid principal balance - with allowance recorded | 3,427 | 5,477 | 204
Recorded investment - with allowance recorded | 3,427 | 5,477 | 204
Allowance for Loan Losses Allocated |  | 2,435 | 204
Average impaired loans - with allowance recorded | 2,456 | 3,185 | 204
Interest income recognized - with allowance recorded | 184 | 300 | 13
Cash basis interest recognized - with allowance recorded | 184 | 300 | 13
Unpaid principal balance - with no allowance recorded |  | 3,638 | 3,812
Recorded investment - with no allowance recorded |  | 3,091 | 3,265
Average impaired loans - with no allowance recorded |  | 3,005 | 2,747
Interest income recognized - with no allowance recorded |  | 178 | 181
Cash basis interest recognized - with no allowance recorded |  | 178 | 181
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |
Unpaid principal balance - with no allowance recorded | 352 | 1,001 | 680
Recorded investment - with no allowance recorded |  | 527 | 680
Average impaired loans - with no allowance recorded |  | 522 | 544
Interest income recognized - with no allowance recorded | 19 | 136 |
Cash basis interest recognized - with no allowance recorded | 19 | 136 |
Residential Portfolio Segment [Member] |  |  |
Unpaid principal balance - with no allowance recorded | 1,420 | 717 | 1,001
Recorded investment - with no allowance recorded | 1,420 | 717 | 1,001
Average impaired loans - with no allowance recorded | 851 | 726 | 809
Interest income recognized - with no allowance recorded | 66 | 31 | 45
Cash basis interest recognized - with no allowance recorded | 66 | 31 | 45
Commercial and Industrial Portfolio Segment [Member] |  |  |
Unpaid principal balance - with allowance recorded | 9,154 | 392 | 4,355
Recorded investment - with allowance recorded | 9,154 | 392 | 4,355
Allowance for Loan Losses Allocated |  | 241 | 1,850
Average impaired loans - with allowance recorded | 8,544 | 391 | 3,545
Interest income recognized - with allowance recorded | 481 |  | 149
Cash basis interest recognized - with allowance recorded | 481 |  | 149
Unpaid principal balance - with no allowance recorded |  | 8,073 | 4,336
Recorded investment - with no allowance recorded |  | 8,073 | 4,336
Average impaired loans - with no allowance recorded |  | 7,681 | 3,985
Interest income recognized - with no allowance recorded |  | 381 | 180
Cash basis interest recognized - with no allowance recorded |  | 381 | 180
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] |  |  |
Unpaid principal balance - with allowance recorded | 203 | 416 | 218
Recorded investment - with allowance recorded | 201 | 416 | 218
Allowance for Loan Losses Allocated |  | 205 | 3
Average impaired loans - with allowance recorded | 208 | 421 | 219
Interest income recognized - with allowance recorded | 7 | 21 | 8
Cash basis interest recognized - with allowance recorded | $ 7 | $ 21 | $ 8

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