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Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Deferred Tax Assets    
Allowance for credit losses on loans, net of recapture $ 157,121 $ 105,475
Acquired loans 152,407 49,093
Unrealized losses on available-for-sale investment securities 141,993 222,467
Operating lease liabilities 65,656 57,495
Benefit plan accruals 43,871 40,089
Net operating loss carryforwards 28,327 19,601
Unrealized losses on held-to-maturity investment securities 23,640 27,664
FDIC deductible premiums 790 3,766
Purchase accounting assets 0 10,062
Other, net 4,550 6,658
Total deferred tax assets 618,355 542,370
Deferred Tax Liabilities    
Operating lease right-of-use assets (60,676) (52,441)
Purchase accounting liabilities (31,694) 0
Loan servicing rights (17,453) (10,012)
Premises and equipment (16,388) (13,358)
Unrealized gains on hedges (7,343) (1,505)
Prepaid expenses (5,685) (3,982)
Tax credit investments and other partnerships (1,809) (2,310)
Other, net (4,138) (2,315)
Total deferred tax liabilities (145,186) (85,923)
Net deferred tax assets $ 473,169 $ 456,447