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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Schedule of the Company's Provision for Income Taxes | The components of the Company’s provision for income taxes for the years ended December 31, 2021, December 31, 2020, and December 31, 2019, were as follows:
(dollars in thousands) |  | 2021 |  |  | 2020 |  |  | 2019 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 58,652 |  |  | $ | 65,840 |  |  | $ | 60,902 |
State |  |  | 10,510 |  |  |  | 12,066 |  |  |  | 14,426 |
Total Current |  |  | 69,162 |  |  |  | 77,906 |  |  |  | 75,328 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 2,254 |  |  |  | (31,783 | ) |  |  | (9,630 | )
State |  |  | 766 |  |  |  | (10,803 | ) |  |  | (5,785 | )
Total Deferred |  |  | 3,020 |  |  |  | (42,586 | ) |  |  | (15,415 | )
Provision for Income Taxes |  | $ | 72,182 |  |  | $ | 35,320 |  |  | $ | 59,913 |
Schedule of Significant Components of the Company's Deferred Tax Liabilities and Assets | As of December 31, 2021, and December 31, 2020, significant components of the Company’s deferred tax liabilities and assets were as follows:
|  | December 31, |
(dollars in thousands) |  | 2021 |  |  | 2020 |
Deferred Tax Liabilities: |  |  |  |  |  |  |  |
Accelerated Depreciation |  | $ | (8,131 | ) |  | $ | (8,042 | )
Accrued Pension Cost |  |  | (11,270 | ) |  |  | (11,270 | )
Federal Home Loan Bank of Des Moines Stock |  |  | (2,885 | ) |  |  | (3,416 | )
Lease Transactions |  |  | (37,585 | ) |  |  | (41,726 | )
Operating Lease Liabilities |  |  | (25,348 | ) |  |  | (26,387 | )
Energy Tax Credits |  |  | — |  |  |  | (674 | )
Net Unrealized Gains on Investments Securities |  |  | — |  |  |  | (18,407 | )
Investment in Variable Interest Entities |  |  | (1,657 | ) |  |  | (2,725 | )
Deferred Loan Fees |  |  | (3,845 | ) |  |  | (4,736 | )
Originated Mortgage Servicing Rights |  |  | (6,068 | ) |  |  | (5,579 | )
Other |  |  | (915 | ) |  |  | (1,124 | )
Gross Deferred Tax Liabilities |  |  | (97,704 | ) |  |  | (124,086 | )
Deferred Tax Assets: |  |  |  |  |  |  |  |
Allowance for Credit Losses |  |  | 43,348 |  |  |  | 57,840 |
Minimum Pension Liability |  |  | 12,082 |  |  |  | 13,430 |
Accrued Expenses |  |  | 22,416 |  |  |  | 17,629 |
Postretirement Benefit Obligations |  |  | 7,170 |  |  |  | 7,980 |
Capital Lease Expenses |  |  | 2,163 |  |  |  | 2,168 |
Operating Lease Right-of-Use Assets |  |  | 27,360 |  |  |  | 28,473 |
Restricted Stock |  |  | 4,442 |  |  |  | 3,669 |
Net Unrealized Losses on Investments Securities |  |  | 11,868 |  |  |  | — |
Deductible State and Local Taxes |  |  | 3,239 |  |  |  | 3,366 |
Low Income Housing Investments |  |  | 3,007 |  |  |  | 3,648 |
Other |  |  | 6,089 |  |  |  | 6,204 |
Gross Deferred Tax Assets Before Valuation Allowance |  |  | 143,184 |  |  |  | 144,407 |
Valuation Allowance |  |  | (3,203 | ) |  |  | (3,597 | )
Gross Deferred Tax Assets After Valuation Allowance |  |  | 139,981 |  |  |  | 140,810 |
Net Deferred Tax Assets |  | $ | 42,277 |  |  | $ | 16,724 |
Schedule of Reconciliation of the Statutory Federal Income Tax Rate to the Company's Effective Tax Rate | The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate for the years ended December 31, 2021, December 31, 2020, and December 31, 2019:
|  | 2021 |  |  | 2020 |  |  | 2019 |
Statutory Federal Income Tax Rate |  |  | 21.00 | % |  |  | 21.00 | % |  |  | 21.00 | %
Increase (Decrease) in Income Tax Rate Resulting From: |  |  |  |  |  |  |  |  |  |  |  |
State Taxes, Net of Federal Income Tax |  |  | 2.85 |  |  |  | 0.81 |  |  |  | 2.53 |
Low-Income Housing Investments |  |  | 0.77 |  |  |  | 0.82 |  |  |  | 0.60 |
Investment Tax Credits |  |  | (0.35 | ) |  |  | (1.24 | ) |  |  | (0.84 | )
Bank-Owned Life Insurance |  |  | (0.48 | ) |  |  | (0.82 | ) |  |  | (0.51 | )
Tax-Exempt Income |  |  | (0.24 | ) |  |  | (0.50 | ) |  |  | (0.53 | )
Leveraged Lease |  |  | (0.10 | ) |  |  | (0.56 | ) |  |  | (1.54 | )
Other |  |  | (1.28 | ) |  |  | (0.83 | ) |  |  | 0.25 |
Effective Tax Rate |  |  | 22.17 | % |  |  | 18.68 | % |  |  | 20.96 | %
Schedule of Reconciliation of the Company's Liability for Unrecognized Tax Benefits | The following presents a reconciliation of the Company’s liability for UTBs for the years ended December 31, 2021, December 31, 2020, and December 31, 2019:
(dollars in thousands) |  | 2021 |  |  | 2020 |  |  | 2019 |
Unrecognized Tax Benefits at Beginning of Year |  | $ | 5,403 |  |  | $ | 6,120 |  |  | $ | 5,541 |
Gross Increases, Related to Tax Positions Taken in a Prior Period |  |  | 261 |  |  |  | 374 |  |  |  | 673 |
Gross Decreases, Related to Tax Positions Taken in a Prior Period |  |  | (1,285 | ) |  |  | — |  |  |  | — |
Gross Increases, Related to Current Period Tax Positions |  |  | 234 |  |  |  | 222 |  |  |  | 715 |
Lapse of Statute of Limitations |  |  | (598 | ) |  |  | (1,313 | ) |  |  | (809 | )
Unrecognized Tax Benefits at End of Year |  | $ | 4,015 |  |  | $ | 5,403 |  |  | $ | 6,120 |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32840-109319 + Details
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