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Income Taxes - Provision for income taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Difference between the provision for income taxes and taxes computed by applying the federal statutory income tax rate to income before provision for income taxes |  |  |
Income taxes at federal statutory rate | $ 132,479 | $ 133,006 | $ 126,899
Increase (reduction) of taxes resulting from: |  |  |
State income taxes, net of federal tax benefit | 19,123 | 21,491 | 18,372
Non- deductible merger expenses |  | 415 |
Increase in cash surrender value of BOLI policies | (5,605) | (5,105) | (3,866)
Tax-exempt interest | (7,016) | (7,828) | (5,450)
Income tax credits | (14,253) | (13,667) | (11,759)
Non-deductible FDIC premiums | 5,330 | 3,287 | 2,380
Non-deductible executive compensation | 4,745 | 4,319 | 530
Other, net | 1,741 | 1,395 | 1,630
Provision for income taxes | 136,544 | 137,313 | $ 128,736
Components of the net deferred tax asset |  |  |
Allowance for credit losses | 123,496 | 101,416 |
Share-based compensation | 10,425 | 10,509 |
Pension plan and post-retirement benefits | 371 | 1,157 |
Deferred compensation | 14,039 | 14,583 |
Purchase accounting adjustments | 1,439 | 1,484 |
Capitalized research and development costs | 4,524 |  |
Accrued expenses | 14,470 | 6,953 |
Other real estate owned |  | 877 |
FDIC special assessment | 6,168 |  |
Net operating loss and tax credit carryforwards | 20,263 | 27,271 |
Nonaccrual Interest | 1,773 | 566 |
Lease liability | 26,076 | 27,675 |
Unrealized losses on investment securities available for sale | 142,543 | 215,013 |
Other | 2,201 | 1,277 |
Total deferred tax assets | 367,788 | 408,781 |
Depreciation | 10,439 | 22,442 |
Intangible assets | 17,764 | 23,558 |
Net deferred loan costs | 16,468 | 10,431 |
Right of use assets | 24,161 | 25,848 |
Prepaid expense | 809 | 836 |
Mark to market liabilities | 92,505 | 110,122 |
Tax deductible goodwill | 12,398 | 9,090 |
Mortgage servicing rights | 20,863 | 21,371 |
Other real estate owned | 192 |  |
Other | 3,950 | 1,776 |
Total deferred tax liabilities | 199,549 | 225,474 |
Net deferred tax assets before valuation allowance | 168,239 | 183,307 |
Less, valuation allowance | (3,885) | (5,506) |
Net deferred tax assets | $ 164,354 | $ 177,801 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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