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Income taxes - Schedule of Net Deferred Tax Assets (Liability) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Deferred tax assets: |  |  |
Allowance for credit losses | $ 51,869 |  | $ 8,113
Operating lease liabilities | 14,892 |  | 9,373
Federal net operating loss | 1,753 |  | 0
Amortization of core deposit intangibles | 0 |  | 1,386
Deferred compensation | 8,250 |  | 5,231
Unrealized loss on debt securities | 0 |  | 54
Unrealized loss on equity securities | 41 |  | 60
Unrealized loss on cash flow hedges | 347 |  | 0
Other | 6,684 |  | 2,388
Subtotal | 83,836 |  | 26,605
Deferred tax liabilities: |  |  |
FHLB stock dividends | (561) |  | (550)
Operating leases - right of use assets | (13,863) |  | (8,641)
Depreciation | (5,689) |  | (5,078)
Amortization of core deposit intangibles | (668) |  | 0
Unrealized gain on cash flow hedges | 0 |  | (203)
Unrealized gain on debt securities | (12,116) |  | (3,051)
Mortgage servicing rights | (18,557) |  | (19,678)
Goodwill | (10,691) |  | (8,859)
Other | 200 |  | (1,035)
Subtotal | (61,945) |  | (47,095)
Net deferred tax assets (liabilities) | 21,891 |  |
Net deferred tax assets (liabilities) |  | $ (20,490) | (20,490)
Income Tax Contingency [Line Items] |  |  |
Federal net operating loss | 1,753 |  | $ 0
Franklin Financial Network, Inc. |  |  |
Deferred tax assets: |  |  |
Federal net operating loss | 8,346 |  |
Income Tax Contingency [Line Items] |  |  |
Federal net operating loss | $ 8,346 |  |

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