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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill
June 30,June 30,
 (Dollars in thousands)20212020
Balance, beginning of year$898,569 $808,322 
Goodwill acquired during the year— 92,844 
Purchase accounting adjustments2,743 — 
Balance, end of year$901,312 $901,166 
Accumulated impairment losses at end of year$— $— 
Schedule of finite-lived intangible assets The following table summarizes the change in the balance of core deposit intangibles and customer relationship intangibles, and the related accumulated amortization for the periods indicated below:
Three Months EndedSix Months Ended
June 30,March 31,June 30,June 30,June 30,
(Dollars in thousands)20212021202020212020
Gross amount of intangible assets:
Beginning balance$145,212 $145,212 $125,945 $145,212 $125,945 
Additions due to acquisitions— — 19,267 — 19,267 
Ending balance145,212 145,212 145,212 145,212 145,212 
Accumulated amortization:
Beginning balance(63,848)(59,705)(46,596)(59,705)(42,633)
Amortization(4,001)(4,143)(4,066)(8,144)(8,029)
Ending balance(67,849)(63,848)(50,662)(67,849)(50,662)
Net intangible assets$77,363 $81,364 $94,550 $77,363 $94,550