Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

The following table presents the original cost and accumulated amortization of intangible assets (in thousands):

	December 31,
	2014		2013
Core deposit premiums	$	33,749	$	33,749
Less accumulated amortization	33,088		32,656
Net core deposit premiums	661		1,093
Other identifiable intangible assets	50,288		36,511
Less accumulated amortization	16,573		13,040
Net other identifiable intangible assets	33,715		23,471
Total intangible assets, net	$	34,376	$	24,564

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Expected amortization expense for intangible assets that will continue to be amortized (in thousands):

	Core Deposit Premiums		Other Identifiable Intangible Assets		Total
2015	$	393	$	3,967	$	4,360
2016	247		3,967		4,214
2017	21		3,735		3,756
2018	—		3,078		3,078
2019	—		2,816		2,816
Thereafter	—		16,152		16,152
	$	661	$	33,715	$	34,376

Schedule of Goodwill [Table Text Block]

The changes in the carrying value of goodwill by operating segment for the year ended December 31, 2014 are as follows (in thousands):

	Commercial			Consumer			Wealth Management		Total
Balance, December 31, 2012
Goodwill	$	271,162		$	39,251		$	51,794	$	362,207
Accumulated impairment losses	—			(228		)	—		(228		)
	271,162			39,023			51,794		361,979
Goodwill adjustments during 2013	(2,220		)	—			—		(2,220		)
Balance, December 31, 2013
Goodwill	268,942			39,251			51,794		359,987
Accumulated impairment losses	—			(228		)	—		(228		)
	268,942			39,023			51,794		359,759
Goodwill acquired during 2014	421			—			17,600		18,021
Balance, December 31, 2014
Goodwill	269,363			39,251			69,394		378,008
Accumulated Impairment	—			(228		)	—		(228		)
	$	269,363		$	39,023		$	69,394	$	377,780