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Loans and Allowance - Impaired financing receivables (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with specific reserves | $ 26 | $ 89
Unpaid Principal Balance with specific reserves | 41 | 293
Interest Income Recognized with specific reserves | 2 | 15
Specific Reserve with specific reserves | 15 | 226
Recorded Investment | 50 | 347
Recorded Investment with no specific reserve | 4,627 | 2,435
Unpaid Principal Balance with no specific reserve | 5,396 | 3,204
Interest Income Recognized with no specific reserve | 109 | 45
Specific Reserve | 20 | 230
Average Recorded Investment with no specific reserve | 5,895 | 3,179
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with specific reserves | 26 | 89
Unpaid Principal Balance with specific reserves | 41 | 89
Interest Income Recognized with specific reserves | 2 | 3
Specific Reserve with specific reserves | 15 | 22
Recorded Investment | 50 | 136
Recorded Investment with no specific reserve | 123 | 116
Unpaid Principal Balance with no specific reserve | 123 | 116
Interest Income Recognized with no specific reserve | 6 |
Residential real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with no specific reserve | 96 | 96
Unpaid Principal Balance with no specific reserve | 96 | 96
Interest Income Recognized with no specific reserve | 8 | 2
Average Recorded Investment with no specific reserve | 122 | 50
Commercial |  |
Financing Receivable, Impaired [Line Items] |  |
Specific Reserve with specific reserves |  | 204
Recorded Investment with no specific reserve | 3,680 | 1,267
Unpaid Principal Balance with no specific reserve | 3,680 | 1,267
Interest Income Recognized with no specific reserve | 81 | 39
Average Recorded Investment with no specific reserve | 3,845 | 1,148
Commercial Mortgage Portfolio Segment |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance with specific reserves |  | 204
Interest Income Recognized with specific reserves |  | 12
Specific Reserve with specific reserves |  | 204
Recorded Investment |  | 211
Recorded Investment with no specific reserve | 728 | 956
Unpaid Principal Balance with no specific reserve | 1,497 | 1,725
Interest Income Recognized with no specific reserve | 14 | 4
Average Recorded Investment with no specific reserve | $ 1,928 | $ 1,981

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 + Details
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- Definition Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired. + 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)(3) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 + Details
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