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Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

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 September 30, 2017, December 31, 2016, and September 30, 2016 and the carrying amount of unamortized intangible assets as of those same dates.

		September 30, 2017								December 31, 2016								September 30, 2016
($ in thousands)		Gross Carrying Amount				Accumulated Amortization				Gross Carrying Amount				Accumulated Amortization				Gross Carrying Amount				Accumulated Amortization
Amortizable intangible assets:
Customer lists		$	6,013				953				2,369				746				2,369				668
Core deposit premiums			18,520				10,084				9,730				8,143				9,730				7,902
Other			1,303				471				1,032				224				1,032				166
Total		$	25,836				11,508				13,131				9,113				13,131				8,736

SBA servicing asset		$	1,306								415								208

Unamortizable intangible assets:
Goodwill		$	144,667								75,042								75,392

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, excluding SBA servicing assets, for the last quarter of calendar year 2017 and for each of the four calendar years ending December 31, 2021 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
October 1 to December 31, 2017		$	902
2018			3,262
2019			2,654
2020			2,090
2021			1,628
Thereafter			3,792
Total		$	14,328