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Securities - Roll-forward by major security type (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Shareholder's equity | $ 577,889,000 | $ 576,708,000 | $ 367,466,000 | $ 271,239,000
Provision (credit) for credit loss | (4,000) |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Ending Balance | 54,000 |  |  |
ASU 2016-03 - Topic 326 |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Shareholder's equity | 58,000 |  |  |
Adjustment |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Shareholder's equity |  | (6,062,000) |  |
Restatement Adjustment | ASU 2016-03 - Topic 326 |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Beginning Balance | $ 58,000 |  |  |
Shareholder's equity |  | $ 2,359,000 |  |

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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + 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 (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 3: 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=121599878&loc=SL82895884-210446 Reference 4: 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=121599337&loc=SL82919249-210447 + Details
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