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Goodwill and Other Intangible Assets
 6 Months Ended
Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
Goodwill
The following table summarizes changes in the carrying amount of goodwill:
(In thousands)At June 30,
2023		At December 31,
2022
Balance, beginning of period$2,514,104 $538,373 
interLINK acquisition143,216 — 
Sterling merger (1)
(25,561)1,939,765 
Bend acquisition (1)
(294)35,966 
Balance, end of period$2,631,465 $2,514,104 
(1)The 2023 changes reflect adjustments recorded within the one-year measurement period, which were identified in the first quarter as a result of extended information gathering and new information that arose from integration activities. The allocation of the purchase price and goodwill calculations for both the Sterling merger and Bend acquisition were final as of March 31, 2023.
Information regarding goodwill by reportable segment can be found within Note 16: Segment Reporting.
Other Intangible Assets
The following table summarizes other intangible assets:
 At June 30, 2023At December 31, 2022
(In thousands)Gross Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount		Gross Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
Core deposits$146,037 $45,623 $100,414 $146,037 $36,710 $109,327 
Customer relationships (1)
151,000 34,362 116,638 115,000 24,985 90,015 
Non-competition agreement (1)
4,000 400 3,600 — — — 
Total other intangible assets$301,037 $80,385 $220,652 $261,037 $61,695 $199,342 
(1)The increase in the gross carrying amount is attributed to the acquisition of interLINK in the first quarter of 2023, in which the Company identified and recorded a $36.0 million intangible asset for broker dealer relationships, which is being amortized on an accelerated basis over an estimated useful life of 10 years, and a $4.0 million non-competition agreement, which is being amortized on a straight-line basis over an estimated useful life of 5 years.
The remaining estimated aggregate future amortization expense for other intangible assets is as follows:
(In thousands)At June 30,
2023
Remainder of 2023$17,517 
202429,618 
202525,956 
202625,565 
202725,565 
Thereafter96,431