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Goodwill and Other Intangible Assets
 3 Months Ended
Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
(In Thousands)
The carrying amounts of goodwill by operating segments as of March 31, 2026 and December 31, 2025 are set forth in the table below.
 Community BanksTotal
Balance at December 31, 2025$1,405,840 $1,405,840 
Additions to goodwill from The First merger827 827 
Balance at March 31, 2026$1,406,667 $1,406,667 

The following table provides a summary of finite-lived intangible assets as of the dates presented:
 
Gross Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
March 31, 2026
Core deposit intangibles$242,102 $(105,930)$136,172 
Customer relationship intangible7,670 (5,450)2,220 
Total finite-lived intangible assets$249,772 $(111,380)$138,392 
December 31, 2025
Core deposit intangibles$242,102 $(97,936)$144,166 
Customer relationship intangible7,670 (5,224)2,446 
Total finite-lived intangible assets$249,772 $(103,160)$146,612 

Amortization expense for finite-lived intangible assets is presented in the table below.
Three Months Ended
March 31,
20262025
Amortization expense for:
  Core deposit intangibles$7,994 $818 
  Customer relationship intangible226 262 
Total intangible amortization$8,220 $1,080