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Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

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, 2018, December 31, 2017, and March 31, 2017 and the carrying amount of unamortized intangible assets as of those same dates.

		March 31, 2018								December 31, 2017								March 31, 2017
($ in thousands)		Gross Carrying Amount				Accumulated Amortization				Gross Carrying Amount				Accumulated Amortization				Gross Carrying Amount				Accumulated Amortization
Amortizable intangible assets:
Customer lists		$	6,013				1,185				6,013				1,090				2,369				806
Core deposit intangibles			28,440				12,803				28,280				11,475				18,520				8,580
SBA servicing asset			3,348				319				2,194				207				579				31
Other			1,303				718				1,303				581				1,032				303
Total		$	39,104				15,025				37,790				13,353				22,500				9,720

Unamortizable intangible
assets:
Goodwill		$	231,681								233,070								142,872

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 three quarters of calendar year 2018 and for each of the four calendar years ending December 31, 2022 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, 2018		$	4,357
2019			4,858
2020			3,841
2021			2,927
2022			2,022
Thereafter			3,045
Total		$	21,050