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Income Taxes - Significant Components of The Company's Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets |  |
Allowance for credit losses | $ 45,891 | $ 14,304
Loans | 11,579 | 10,284
Deferred compensation | 11,605 | 12,050
Impairment of assets | 1,631 | 1,108
Net operating loss carryforwards | 2,607 | 9,387
Lease liabilities under operating leases | 22,271 | 22,686
Other | 208 | 934
Total deferred tax assets | 95,792 | 70,753
Deferred tax liabilities |  |
Net unrealized gains on securities | 6,057 | 190
Investment in partnerships | 982 | 967
Fixed assets | 7,688 | 2,952
Mortgage servicing rights | 14,121 | 13,472
Junior subordinated debt | 2,237 | 2,304
Lease right-of-use asset | 21,203 | 21,727
Other | 1,457 | 1,859
Total deferred tax liabilities | 53,745 | 43,471
Net deferred tax assets | $ 42,047 | $ 27,282

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