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Goodwill and Other Intangible Assets
3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets GOODWILL AND OTHER INTANGIBLE ASSETS
 
Goodwill is tested annually, or more often than annually, if circumstances warrant, for impairment. If the implied fair value of goodwill is lower than its carrying amount, goodwill impairment is indicated, and goodwill is written down to its implied fair value. Subsequent increases in goodwill value are not recognized in the financial statements. Goodwill totaled $1.32 billion at March 31, 2024 and December 31, 2023. Goodwill impairment was neither indicated nor recorded during the three months ended March 31, 2024 or the year ended December 31, 2023.

Core deposit premiums represent the value of the relationships that acquired banks had with their deposit customers and are amortized over periods ranging from 10 years to 15 years and are periodically evaluated, at least annually, as to the recoverability of their carrying value. Other intangible assets represent the value of other acquired relationships, including relationships with trust and wealth management customers, and are being amortized over various periods ranging from 8 years to 15 years.
 
Changes in the carrying amount and accumulated amortization of the Company’s core deposit premiums and other intangible assets at March 31, 2024 and December 31, 2023 were as follows: 
March 31,December 31,
(In thousands)20242023
Core deposit premiums:
Balance, beginning of year$101,344 $116,016 
Amortization(3,442)(14,672)
Balance, end of period97,902 101,344 
Books of business and other intangibles:
Balance, beginning of year11,301 12,935 
Amortization(408)(1,634)
Balance, end of period10,893 11,301 
Total other intangible assets, net$108,795 $112,645 
The carrying basis and accumulated amortization of the Company’s other intangible assets at March 31, 2024 and December 31, 2023 were as follows: 
March 31,December 31,
(In thousands)20242023
Core deposit premiums:
Gross carrying amount$177,624 $187,467 
Accumulated amortization(79,722)(86,123)
Core deposit premiums, net97,902 101,344 
Books of business and other intangibles:
Gross carrying amount22,068 22,068 
Accumulated amortization(11,175)(10,767)
Books of business and other intangibles, net10,893 11,301 
Total other intangible assets, net$108,795 $112,645 

The Company’s estimated remaining amortization expense on other intangible assets as of March 31, 2024 is as follows: 
(In thousands)YearAmortization
Expense
 Remainder of 2024$11,553 
 202512,819 
 202612,346 
 202712,218 
 202811,312 
 Thereafter48,547 
 Total$108,795