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Loans and Allowance for Credit Losses - Purchased credit-impaired loans (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Loans |  |
Total Recorded Investment | $ 5,628 | $ 5,269
Related Allowance | 56 | 307
Contractually required payments receivable on PCI loans at acquisition: | 6,194 | 5,717
Cash flows expected to be collected at acquisition | 1,901 | 3,715
Purchased Credit Impaired Loans |  |
Loans |  |
Total Recorded Investment | 404 | 612
Related Allowance | 0 | 0
Contractually required payments receivable on PCI loans at acquisition: | 0 | 982
Fair value of acquired loans at acquisition | 0 | 631
Commercial | Purchased Credit Impaired Loans |  |
Loans |  |
Total Recorded Investment | 404 | 612
Contractually required payments receivable on PCI loans at acquisition: | 0 | 982
Cash flows expected to be collected at acquisition | $ 0 | $ 693

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- Definition 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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