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Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred Tax Assets    
Unrealized losses on available-for-sale investment securities $ 222,467 $ 217,018
Allowance for credit losses on loans, net of recapture 105,475 86,224
Operating lease liabilities 57,495 57,996
Acquired loans 49,093 32,011
Benefit plan accruals 40,089 31,679
Unrealized losses on held-to-maturity investment securities 27,664 32,150
Net operating loss carryforwards 19,601 21,004
Purchase accounting 10,062 22,473
FDIC deductible premiums 3,766 4,891
Other, net 6,658 4,860
Total deferred tax assets 542,370 510,306
Deferred Tax Liabilities    
Operating lease right-of-use assets (52,441) (52,710)
Premises and equipment (13,358) (12,141)
Loan servicing rights (10,012) (9,188)
Prepaid expenses (3,982) (3,856)
Tax credit investments and other partnerships (2,310) (785)
Unrealized gains on hedges (1,505) (3,202)
Deferred loan origination fees 0 (2,361)
Other, net (2,315) (2,803)
Total deferred tax liabilities (85,923) (87,046)
Net deferred tax assets $ 456,447 $ 423,260