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Income Taxes - Significant Components of The Company's Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets |  |
Allowance for credit losses | $ 52,345 | $ 53,597
Loans | 3,471 | 5,526
Deferred compensation | 13,598 | 13,114
Investment in partnerships | 154 | 0
Impairment of assets | 508 | 1,067
Net operating loss carryforwards | 1,287 | 1,857
Lease liabilities under operating leases | 17,189 | 17,732
Other | 3,613 | 3,539
Total deferred tax assets | 92,165 | 96,432
Deferred tax liabilities |  |
Net unrealized gains on securities | 3,580 | 8,434
Investment in partnerships | 0 | 793
Fixed assets | 1,182 | 3,285
Mortgage servicing rights | 20,587 | 14,623
Junior subordinated debt | 2,162 | 2,245
Intangibles | 3,349 | 3,882
Lease right-of-use asset | 16,291 | 16,833
Other | 565 | 1,672
Total deferred tax liabilities | 47,716 | 51,767
Net deferred tax assets | $ 44,449 | $ 44,665

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