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Income Taxes - Provision for income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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 $ 133,006 $ 126,899 $ 21,834
Increase (reduction) of taxes resulting from:      
State income taxes, net of federal tax benefit 21,491 18,372 3,077
Non- deductible merger expenses 415   1,344
Increase in cash surrender value of BOLI policies (5,105) (3,866) (2,389)
Tax-exempt interest (7,828) (5,450) (2,257)
Income tax credits (13,667) (11,759) (7,138)
Non-deductible FDIC premiums 3,287 2,380 1,364
Non-deductible executive compensation 4,319 530 1,016
Benefit of tax loss carryback under CARES Act     (31,468)
Other, net 1,395 1,630 (2,043)
(Benefit) provision for income taxes 137,313 128,736 $ (16,660)
Components of the net deferred tax asset      
Allowance for loan losses 101,416 81,767  
Share-based compensation 10,509 6,290  
Pension plan and post-retirement benefits 1,157 752  
Deferred compensation 14,583 14,437  
Purchase accounting adjustments 1,484    
Accrued expenses 6,953    
Other real estate owned 877 1,577  
Net operating loss and tax credit carryforwards 27,271 20,659  
Nonaccrual Interest 566 88  
Lease liability 27,675 28,514  
Mark to market assets   11,788  
Unrealized losses on investment securities available for sale 215,013 6,691  
Other 1,277 719  
Total deferred tax assets 408,781 173,282  
Depreciation 22,442 21,028  
Intangible assets 23,558 27,732  
Net deferred loan costs 10,431 3,579  
Right of use assets 25,848 27,136  
Prepaid expense 836 725  
Mark to market liabilities 110,122    
Tax deductible goodwill 9,090 5,994  
Mortgage servicing rights 21,371 16,100  
Purchase accounting adjustments   890  
Other 1,776 302  
Total deferred tax liabilities 225,474 103,486  
Net deferred tax assets before valuation allowance 183,307 69,796  
Less, valuation allowance (5,506) (4,832)  
Net deferred tax assets $ 177,801 $ 64,964