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Goodwill and Other Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangibles
Changes in the carrying amount and accumulated amortization of the Company’s core deposit premiums and other intangible assets at September 30, 2020 and December 31, 2019 were as follows: 
 
September 30,December 31,
(In thousands)20202019
Core deposit premiums:
Balance, beginning of year$111,808 $79,807 
Acquisitions(1)
— 42,695 
Disposition of intangible asset(2)
(2,324)— 
Amortization(9,114)(10,694)
Balance, end of period100,370 111,808 
Books of business and other intangibles:
Balance, beginning of year15,532 11,527 
Acquisitions(3)
— 5,116 
Disposition of intangible asset(413)— 
Amortization(1,029)(1,111)
Balance, end of period14,090 15,532 
Total other intangible assets, net$114,460 $127,340 
_________________________
(1)    Core deposit premiums of $24.3 million and $18.4 million were recorded during 2019 as part of the Landrum and Reliance acquisitions, respectively. See Note 2, Acquisitions, for additional information on acquisitions completed in 2019.
(2)    Adjustments recorded for the premiums on certain deposit liabilities associated with the sale of the Texas Branches and Colorado Branches.
(3)    The Company recorded $5.1 million during 2019 primarily related to the wealth management operations acquired from Landrum. See Note 2, Acquisitions, for additional information on acquisitions completed in 2019.
The carrying basis and accumulated amortization of the Company’s other intangible assets at September 30, 2020 and December 31, 2019 were as follows:  

September 30,December 31,
(In thousands)20202019
Core deposit premiums:
Gross carrying amount$146,355 $148,679 
Accumulated amortization(45,985)(36,871)
Core deposit premiums, net100,370 111,808 
Books of business and other intangibles:
Gross carrying amount19,938 20,350 
Accumulated amortization(5,848)(4,818)
Books of business and other intangibles, net14,090 15,532 
Total other intangible assets, net$114,460 $127,340 
Estimated Remaining Amortization Expense
The Company’s estimated remaining amortization expense on other intangible assets as of September 30, 2020 is as follows:
 
(In thousands)YearAmortization
Expense
 Remainder of 2020$3,351 
 202113,379 
 202213,327 
 202313,044 
 202412,141 
 Thereafter59,218 
 Total$114,460