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Income Taxes - Schedule of Significant Components of the Company's Deferred Tax Liabilities and Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred Tax Liabilities:    
Accelerated Depreciation $ (8,513) $ (7,958)
Accrued Pension Cost (11,270) (11,270)
Federal Home Loan Bank of Des Moines Stock (3,416) (6,597)
Lease Transactions (22,571) (25,741)
Operating Lease Liabilities (22,826) (24,469)
Investment in Variable Interest Entities (887) (700)
Deferred Loan Fees (4,496) (4,798)
Originated Mortgage Servicing Rights (5,553) (6,008)
Other (16) (909)
Gross Deferred Tax Liabilities (79,548) (88,450)
Deferred Tax Assets:    
Allowance for Credit Losses 40,370 40,056
Minimum Pension Liability 8,390 9,046
Accrued Expenses 20,020 20,066
Postretirement Benefit Obligations 7,058 7,005
Capital Lease Expenses 2,148 2,156
Operating Lease Right-of-Use Assets 25,102 26,648
Restricted Stock 6,535 5,988
Net Unrealized Losses on Investments Securities 134,685 147,716
Deductible State and Local Taxes 1,966 2,360
Low Income Housing Investments 4,569 5,349
Other 10,049 5,995
Gross Deferred Tax Assets Before Valuation Allowance 260,892 272,385
Valuation Allowance (6,728) (6,222)
Gross Deferred Tax Assets After Valuation Allowance 254,164 266,163
Net Deferred Tax Assets $ 174,616 $ 177,713