Goodwill and Acquired Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Acquired intangible assets consist of core deposit intangibles

Acquired intangible assets consist of core deposit intangibles ("CDI"), which are intangible assets arising from the purchase of deposits separately or from the acquisitions of BANKshares in 2014, Grand Bankshares in 2015, and Floridian Financial Group and BMO Harris's Orlando operations, each in 2016. The change in balance for CDI is as follows:

	2016		2015		2014
	(In thousands)
Beginning of year	$	8,594	$	7,454	$	718
Acquired CDI		8,464		2,564		7,769
Amortization expense		(2,486)		(1,424)		(1,033)
End of year	$	14,572	$	8,594	$	7,454
		(In months)
Remaining Average Amoritzation Period		64		67		71

Gross Carrying Amount and Accumulated Amortization of Intangible Asset

The gross carrying amount and accumulated amortization of the Company's intangible asset subject to amortization at December 31 is presented below.

	2016				2015
	Gross				Gross
	Carrying		Accumulated		Carrying		Accumulated
	Amount		Amortization		Amount		Amortization
	(In thousands)
Deposit base	$	18,796	$	(4,224)	$	19,827	$	(11,233)