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Goodwill and Other Intangible Assets (Tables)
6 Months Ended
Jun. 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 June 30, 2020 and December 31, 2019 were as follows: 
 
June 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(6,094) (10,694) 
Balance, end of period103,390  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(686) (1,111) 
Balance, end of period14,433  15,532  
Total other intangible assets, net$117,823  $127,340  
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(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 June 30, 2020 and December 31, 2019 were as follows:  

June 30,December 31,
(In thousands)20202019
Core deposit premiums:
Gross carrying amount$146,355  $148,679  
Accumulated amortization(42,965) (36,871) 
Core deposit premiums, net103,390  111,808  
Books of business and other intangibles:
Gross carrying amount19,938  20,350  
Accumulated amortization(5,505) (4,818) 
Books of business and other intangibles, net14,433  15,532  
Total other intangible assets, net$117,823  $127,340  
Estimated Remaining Amortization Expense
The Company’s estimated remaining amortization expense on other intangible assets as of June 30, 2020 is as follows:
 
(In thousands)YearAmortization
Expense
 Remainder of 2020$6,714  
 202113,379  
 202213,327  
 202313,044  
 202412,141  
 Thereafter59,218  
 Total$117,823