Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

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):

	Dec. 31,
	2015		2014
Core deposit premiums	$	33,749	$	33,749
Less accumulated amortization	33,481		33,088
Net core deposit premiums	268		661
Other identifiable intangible assets	63,689		50,288
Less accumulated amortization	20,048		16,573
Net other identifiable intangible assets	43,641		33,715
Total intangible assets, net	$	43,909	$	34,376

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
2016	$	247	$	3,967	$	4,214
2017	21		3,735		3,756
2018	—		3,078		3,078
2019	—		2,816		2,816
2020	—		2,816		2,816
Thereafter	—		27,229		27,229
	$	268	$	43,641	$	43,909

Schedule of Goodwill [Table Text Block]

The changes in the carrying value of goodwill by operating segment for the year ended December 31, 2015 are as follows (in thousands):

	Commercial		Consumer			Wealth Management		Total
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 losses	—		(228		)	—		(228		)
	269,363		39,023			69,394		377,780
Goodwill acquired during 2015	7,681		—			—		7,681
Balance, December 31, 2015
Goodwill	277,044		39,251			69,394		385,689
Accumulated impairment losses	—		(228		)	—		(228		)
	$	277,044	$	39,023		$	69,394	$	385,461