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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Beginning balance |  |  |  | $ 4,065 |  |  |  | $ 3,634 |  |  |  | $ 3,386 | $ 4,065 | $ 3,634 | $ 3,386 |  |
Provisions | $ 450 | $ 225 | $ 300 | 450 | $ 200 | $ 455 | $ 316 | 197 | $ 298 | $ 150 | $ 256 | 211 | 1,425 | 1,168 | 915 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (766) | (1,027) | (936) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 337 | 290 | 269 |  |
Ending balance | 5,061 |  |  |  | 4,065 |  |  |  | 3,634 |  |  |  | 5,061 | 4,065 | 3,634 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16 | $ 48
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,033 | 4,017
Acquired with deteriorated credit quality | 5,061 |  |  | 4,065 | 4,065 |  |  | 3,634 | 3,634 |  |  | 3,386 | 5,061 | 3,634 | 3,386 | 5,061 | 4,065
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,747 | 3,785
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 470,116 | 435,740
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 473,187 | 439,855
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance | 12 |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |
Acquired with deteriorated credit quality | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 324 | 330
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 693 |  |  |  | 219 |  |  |  | 380 | 693 | 219 | 380 |  |
Provisions |  |  |  |  |  |  |  |  |  |  |  |  | 251 | 723 | (120) |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (194) | (258) | (74) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 117 | 9 | 33 |  |
Ending balance | 867 |  |  |  | 693 |  |  |  | 219 |  |  |  | 867 | 693 | 219 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 | 3
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 839 | 690
Acquired with deteriorated credit quality | 867 |  |  | 693 | 693 |  |  | 219 | 219 |  |  | 380 | 867 | 219 | 380 | 867 | 693
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,926 | 2,184
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130,328 | 134,553
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 132,539 | 137,019
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance | 12 |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |
Acquired with deteriorated credit quality | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 285 | 282
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 162 |  |  |  | 133 |  |  |  | 56 | 162 | 133 | 56 |  |
Provisions |  |  |  |  |  |  |  |  |  |  |  |  |  | 29 | 77 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Ending balance | 163 |  |  |  | 162 |  |  |  | 133 |  |  |  | 163 | 162 | 133 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 163 | 162
Acquired with deteriorated credit quality | 163 |  |  | 162 | 162 |  |  | 133 | 133 |  |  | 56 | 163 | 133 | 56 | 163 | 162
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115 | 152
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,199 | 22,592
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,314 | 22,744
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 224 |  |  |  | 245 |  |  |  | 80 | 224 | 245 | 80 |  |
Provisions |  |  |  |  |  |  |  |  |  |  |  |  | 126 | (21) | 165 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance | 350 |  |  |  | 224 |  |  |  | 245 |  |  |  | 350 | 224 | 245 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350 | 224
Acquired with deteriorated credit quality | 350 |  |  | 224 | 224 |  |  | 245 | 245 |  |  | 80 | 350 | 245 | 80 | 350 | 224
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 521
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,644 | 24,921
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,644 | 25,442
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,401 |  |  |  | 1,622 |  |  |  | 1,670 | 1,401 | 1,622 | 1,670 |  |
Provisions |  |  |  |  |  |  |  |  |  |  |  |  | 222 | (296) | (124) |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  | 75 | 79 |  |
Ending balance | 1,623 |  |  |  | 1,401 |  |  |  | 1,622 |  |  |  | 1,623 | 1,401 | 1,622 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,623 | 1,357
Acquired with deteriorated credit quality | 1,623 |  |  | 1,401 | 1,401 |  |  | 1,622 | 1,622 |  |  | 1,670 | 1,623 | 1,622 | 1,670 | 1,623 | 1,401
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 353 | 466
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 121,421 | 107,158
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 121,813 | 107,672
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39 | 48
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 459 |  |  |  | 291 |  |  |  | 198 | 459 | 291 | 198 |  |
Provisions |  |  |  |  |  |  |  |  |  |  |  |  | 132 | 218 | 226 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  |  | (51) | (140) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 1 | 7 |  |
Ending balance | 595 |  |  |  | 459 |  |  |  | 291 |  |  |  | 595 | 459 | 291 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 595 | 458
Acquired with deteriorated credit quality | 595 |  |  | 459 | 459 |  |  | 291 | 291 |  |  | 198 | 595 | 291 | 198 | 595 | 459
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 249 | 427
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,200 | 35,990
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,449 | 36,417
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 443 |  |  |  | 710 |  |  |  | 683 | 443 | 710 | 683 |  |
Provisions |  |  |  |  |  |  |  |  |  |  |  |  | 77 | (278) | 28 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (24) | (21) | (6) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 19 | 32 | 5 |  |
Ending balance | 515 |  |  |  | 443 |  |  |  | 710 |  |  |  | 515 | 443 | 710 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 515 | 443
Acquired with deteriorated credit quality | 515 |  |  | 443 | 443 |  |  | 710 | 710 |  |  | 683 | 515 | 710 | 683 | 515 | 443
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56 | 35
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,932 | 52,968
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,988 | 53,003
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 683 |  |  |  | 414 |  |  |  |  | 683 | 414 |  |  |
Provisions |  |  |  |  |  |  |  |  |  |  |  |  | 617 | 793 |  |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (548) | (697) |  |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 196 | 173 |  |  |
Ending balance | 948 |  |  |  | 683 |  |  |  | 414 |  |  |  | 948 | 683 | 414 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 948 | 683
Acquired with deteriorated credit quality | 948 |  |  | 683 | 683 |  |  | 414 | 414 |  |  |  | 948 | 414 | 414 | 948 | 683
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48 |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,392 | 57,558
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,440 | 57,558
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  | 414 |  |  |  | 319 |  | 414 | 319 |  |
Provisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 663 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (713) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145 |  |
Ending balance |  |  |  |  |  |  |  |  | 414 |  |  |  |  |  | 414 |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  | $ 414 | $ 414 |  |  | $ 319 |  | $ 414 | $ 414 |  |
Recorded investment in loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65,440 | $ 57,558

X
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: 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 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: 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 + 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 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)(4) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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 The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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