Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of carrying amount of goodwill and other intangible assets

The carrying amount of goodwill and other intangible assets as of the dates indicated is summarized below (in thousands): 

	September 30, 2020		December 31, 2019
Core deposit intangible	$	36,162	$	32,802
Less: accumulated amortization	(21,106)		(17,980)
Net core deposit intangible	15,056		14,822
Goodwill	369,018		327,425
Total goodwill and other intangible assets, net	$	384,074	$	342,247

Schedule of changes in the carrying amounts of goodwill

The following is a summary of changes in the carrying amounts of goodwill (in thousands): 

	Three Months Ended September 30,						Nine Months Ended September 30,
2020	Goodwill		Accumulated Impairment Losses		Goodwill, net of Accumulated Impairment Losses		Goodwill		Accumulated Impairment Losses		Goodwill, net of Accumulated Impairment Losses
Balance, beginning of period	$	633,015	$	(305,590)	$	327,425	$	633,015	$	(305,590)	$	327,425
Acquisition of Three Shores	41,593		—		41,593		41,593		—		41,593
Balance, end of period	$	674,608	$	(305,590)	$	369,018	$	674,608	$	(305,590)	$	369,018
2019
Balance, beginning of period	$	633,015	$	(305,590)	$	327,425	$	612,702	$	(305,590)	$	307,112
Acquisition of FMBT	—		—		—		20,313		—		20,313
Balance, end of period	$	633,015	$	(305,590)	$	327,425	$	633,015	$	(305,590)	$	327,425

Schedule of estimated aggregate amortization expense for future periods for core deposit intangibles

The estimated aggregate amortization expense for future periods for core deposit intangibles is as follows (in thousands):

Year
Remainder of 2020	$	1,042
2021	3,622
2022	2,915
2023	2,321
2024	1,834
Thereafter	3,322
Total	$	15,056