Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Net carrying value of other intangible assets

The following table shows the net carrying value of the Corporation's other intangible assets:

	December 31,
	2014		2013
	(In thousands)
Other intangible assets:
Core deposit intangible assets	$	20,863	$	10,001
Mortgage servicing rights (MSRs)	12,217		3,423
Total other intangible assets	$	33,080	$	13,424

Carrying amount, accumulated amortization and amortization expense of core deposit intangible assets

The following table sets forth the carrying amount, accumulated amortization and amortization expense of core deposit intangible assets that are amortizable and arose from business combinations or other acquisitions:

	December 31,
	2014		2013
	(In thousands)
Gross original amount	$	31,550	$	18,659
Accumulated amortization	10,687		8,658
Carrying amount	$	20,863	$	10,001
Amortization expense for the year ended December 31	$	2,029	$	1,909

Net carrying value and fair value of MSRs and total loans that Corporation is servicing for others

The following shows the net carrying value and fair value of MSRs and the total loans that the Corporation is servicing for others:

	December 31,
	2014		2013
	(In thousands)
Net carrying value of MSRs	$	12,217	$	3,423
Fair value of MSRs	$	14,979	$	6,878
Loans serviced for others that have servicing rights capitalized	$	2,093,140	$	886,730

Activity for capitalized MSRs

The following shows activity for capitalized MSRs for the last three years:

	Years Ended December 31,
	2014			2013			2012
	(In thousands)
Balance at beginning of year	$	3,423		$	3,478		$	3,593
Acquired in Northwestern acquisition	9,235			—			—
Additions	1,075			1,528			2,285
Amortization	(1,316		)	(1,583		)	(2,400		)
Increase in valuation allowance	(200		)	—			—
Balance at end of year	$	12,217		$	3,423		$	3,478
Valuation allowance at December 31	$	200		$	—		$	—