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Goodwill and Core Deposits and Other Intangibles (Tables)
 9 Months Ended
Sep. 30, 2025
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 September 30, 2025 and December 31, 2024, were as follows:
September 30, 2025December 31, 2024
(In thousands)
Goodwill
Balance, beginning of period$1,398,253 $1,398,253 
Balance, end of period$1,398,253 $1,398,253 
September 30, 2025December 31, 2024
(In thousands)
Core Deposit Intangibles
Balance, beginning of period, January 1$40,327 $48,770 
Amortization expense(6,096)(6,375)
Balance, September 30$34,231 42,395 
Amortization expense(2,068)
Balance, end of year$40,327 
Summary of Carrying Amount and Accumulated Amortization of Core Deposits and Other Intangibles
The carrying basis and accumulated amortization of core deposit intangibles at September 30, 2025 and December 31, 2024 were:
September 30, 2025December 31, 2024
(In thousands)
Gross carrying basis$128,888 $128,888 
Accumulated amortization(94,657)(88,561)
Net carrying amount$34,231 $40,327