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Income Taxes - Differences Between Tax Basis of Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Deferred tax assets:    
Allowance for credit losses $ 82,359 $ 81,251
Deferred compensation 6,034 7,619
Stock compensation 5,258 6,803
Non-accrual interest income 1,627 1,463
Real estate owned 70 79
Unrealized loss on investment securities, available-for-sale 83,938 81,493
Loan discounts 4,117 5,119
Investments 23,925 25,789
Other 19,431 14,691
Gross deferred tax assets 226,759 224,307
Deferred tax liabilities:    
Accelerated depreciation on premises and equipment 288 1,477
Tax basis on acquisitions 5,814 4,061
Core deposit intangibles 10,073 11,021
FHLB dividends 2,677 2,351
Other 12,866 8,233
Gross deferred tax liabilities 31,718 27,143
Net deferred tax assets $ 195,041 $ 197,164