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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Receivables [Abstract] |  |  |
Impaired loans without a valuation allowance | $ 1,808 | $ 1,131 |
Impaired loans with a valuation allowance | 246 | 614 |
Total impaired loans | 2,054 | 1,745 |
Valuation allowance related to impaired loans | 31 | 106 |
Total non-accrual loans | 542 | 1,003 |
Total loans past-due ninety days or more and still accruing | 0 | 0 |
Average investment in impaired loans | 1,958 | 1,885 | $ 1,802
Interest income recognized on impaired loans | 69 | 57 | 64
Interest income recognized on a cash basis on impaired loans | $ 17 | $ 23 | $ 27

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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