Goodwill and intangible assets (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill Activity
Goodwill
Balance at December 31, 2018$137,190 
Addition from acquisition of Atlantic Capital branches31,961 
Relief of goodwill due to sale of TPO mortgage delivery channel(100)
Balance at December 31, 2019$169,051 
Balance at December 31, 2019$169,051 
Addition from acquisition of Farmers National6,319 
Addition from acquisition of Franklin67,191 
Balance at December 31, 2020$242,561 
Schedule of Core Deposit and Other Intangibles The composition of core deposit and other intangibles as of December 31, 2020 and December 31, 2019 is as follows:
 Core deposit and other intangibles
 Gross Carrying Amount Accumulated Amortization Net Carrying Amount
December 31, 2020   
Core deposit intangible$59,835 $(38,807)$21,028 
Customer base trust intangible1,600 (547)1,053 
Manufactured housing servicing intangible1,088 (743)345 
Total core deposit and other intangibles$62,523 $(40,097)$22,426 
December 31, 2019
Core deposit intangible$49,675 $(33,861)$15,814 
Customer base trust intangible1,600 (387)1,213 
Manufactured housing servicing intangible1,088 (526)562 
Total core deposit and other intangibles$52,363 $(34,774)$17,589 
Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles
The estimated aggregate future amortization expense of core deposit and other intangibles is as follows:
2021$5,477 
20224,586 
20233,658 
20242,946 
20252,306 
Thereafter3,453 
 $22,426