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Mergers and acquisitions - Schedule of Purchased Credit Deteriorated Credit Quality (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 15, 2020 | Feb. 14, 2020 | Sep. 30, 2020 | Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Deterioration credit quality since origination, percentage | 28.20% | 10.10% |  |
Allowance for credit loss, purchased with credit deterioration |  |  | $ 24,831 | $ 25,500
Franklin Financial Network, Inc. |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal balance | $ 703,143 |  |  |
Allowance for credit losses at acquisition | (24,831) |  |  |
Net premium attributable to other factors | 8,530 |  |  |
Loans purchased credit-deteriorated fair value | 686,842 |  |  |
Allowance for credit loss, purchased with credit deterioration | $ 52,822 |  |  |
FNB Financial Corp. |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal balance |  | $ 18,964 |  |
Allowance for credit losses at acquisition |  | (669) |  |
Net premium attributable to other factors |  | 63 |  |
Loans purchased credit-deteriorated fair value |  | 18,358 |  |
Allowance for credit loss, purchased with credit deterioration |  | $ 2,885 |  |

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- Definition Amount of increase in allowance for credit loss on financing receivable purchased with credit deterioration. + 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 (c) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919265-210447 + Details
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- Definition Amount of discount (premium) attributable to other factors on financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919265-210447 + Details
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