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Loans and Allowance for Credit Losses - Credit impaired loans acquired during the period (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Contractually required payments receivable on PCI loans at acquisition: | $ 6,954,000 | $ 5,717,000
Cash flows expected to be collected at acquisition | 1,070,000 | 3,715,000
Purchased credit impaired loans | 6,366,000 | 5,269,000
Related Allowance | 36,000 | 307,000
Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Contractually required payments receivable on PCI loans at acquisition: | 0 | 982,000
Purchased credit impaired loans | 383,000 | 612,000
Related Allowance | 0 | 0
Fair value of acquired loans at acquisition | 0 | 631,000
Commercial | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Contractually required payments receivable on PCI loans at acquisition: | 0 | 982,000
Cash flows expected to be collected at acquisition | 0 | 693,000
Purchased credit impaired loans | $ 383,000 | $ 612,000

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- Definition The amount of any significant purchases of financing receivables during the reporting period. + 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 (e) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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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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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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- Definition Amount of investment in impaired financing receivables for which there is 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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