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Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred Tax Assets    
Allowance for credit losses on loans, net of recapture $ 85,619 $ 28,843
Benefit plan accruals 38,038 18,348
Net operating loss carryforwards 25,135 14,823
Acquired loans 40,723 8,039
Operating lease liabilities 58,288 22,961
Unrealized losses on available-for-sale investment securities 202,101 3,003
Unrealized losses on held-to-maturity investment securities 36,197 0
Unrealized losses on hedges 10,277 0
Purchase accounting 20,063 0
Other, net 4,962 3,430
Total deferred tax assets 521,403 99,447
Deferred Tax Liabilities    
Deferred loan origination fees (3,566) 0
Purchase accounting 0 (18,524)
Loan servicing rights (9,636) (7,379)
Premises and equipment (14,844) (16,972)
Prepaid expenses (2,774) (796)
Operating lease right-of-use assets (51,845) (21,129)
Unrealized gains on hedges 0 (177)
Other, net (2,983) (1,564)
Total deferred tax liabilities (85,648) (66,541)
Net deferred tax assets $ 435,755 $ 32,906