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Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill And Other Intangible Assets [Abstract]

Summary of the gross carrying amount and accumulated amortization of amortizable intangible assets and the carrying amount of unamortized intangible assets

The following is a summary of the gross carrying amount and accumulated amortization of amortizable intangible assets as of March 31, 2019, December 31, 2018, and March 31, 2018 and the carrying amount of unamortized intangible assets as of those same dates.

		March 31, 2019								December 31, 2018								March 31, 2018
($ in thousands)		Gross Carrying Amount				Accumulated Amortization				Gross Carrying Amount				Accumulated Amortization				Gross Carrying Amount				Accumulated Amortization
Amortizable intangible assets:
Customer lists		$	6,013				1,774				6,013				1,637				6,013				1,185
Core deposit intangibles			28,440				17,585				28,440				16,469				28,440				12,803
SBA servicing asset			6,072				1,352				5,472				1,053				3,348				319
Other			1,303				1,036				1,303				957				1,303				718
Total		$	41,828				21,747				41,228				20,116				39,104				15,025

Unamortizable intangible
assets:
Goodwill		$	234,368								234,368								231,681

Schedule of the estimated amortization expense for the five succeeding fiscal years

The following table presents the estimated amortization expense related to amortizable intangible assets for the last three quarters of calendar year 2019 and for each of the four calendar years ending December 31, 2023 and the estimated amount amortizable thereafter. These estimates are subject to change in future periods to the extent management determines it is necessary to make adjustments to the carrying value or estimated useful lives of amortized intangible assets.

($ in thousands)		Estimated Amortization Expense
April 1 to December 31, 2019		$	4,191
2020			4,641
2021			3,628
2022			2,525
2023			1,453
Thereafter			3,643
Total		$	20,081