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Goodwill and Core Deposits and Other Intangibles (Tables)
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Changes in Carrying Amount and Accumulated Amortization of Company's Goodwill and Core Deposits and Other Intangibles
Changes in the carrying amount and accumulated amortization of the Company’s goodwill and core deposits and other intangibles at March 31, 2024 and December 31, 2023, were as follows:
March 31, 2024December 31, 2023
(In thousands)
Goodwill
Balance, beginning of period$1,398,253 $1,398,253 
Acquisitions
— — 
Balance, end of period$1,398,253 $1,398,253 
March 31, 2024December 31, 2023
(In thousands)
Core Deposit Intangibles
Balance, beginning of period$48,770 $58,455 
Amortization expense(2,140)(2,477)
Balance, March 31
$46,630 55,978 
Amortization expense(7,208)
Balance, end of year$48,770 
Summary of Carrying Amount and Accumulated Amortization of Core Deposits and Other Intangibles
The carrying basis and accumulated amortization of core deposit intangibles at March 31, 2024 and December 31, 2023 were:
March 31, 2024December 31, 2023
(In thousands)
Gross carrying basis$128,888 $128,888 
Accumulated amortization(82,258)(80,118)
Net carrying amount$46,630 $48,770