Other Assets (Tables)

12 Months Ended

Dec. 31, 2015

Other Assets

Schedule of carrying amount of goodwill reported in reporting units

	Retail		Commercial
(in thousands)	Banking		Banking		Total
December 31, 2015	$	687,492	$	308,000	$	995,492
December 31, 2014		687,492		308,000		995,492

Schedule of estimated future amortization expense for mortgage servicing rights

	Estimated
(dollars in thousands)	Amortization
Year ending December 31:
2016	$	3,256
2017		2,833
2018		2,478
2019		2,174
2020		1,905

Schedule of details of mortgage servicing rights

	December 31,
(dollars in thousands)	2015		2014
Gross carrying amount	$	56,479	$	54,693
Accumulated amortization		35,044		29,502
Net carrying value	$	21,435	$	25,191

Schedule of changes in amortized mortgage servicing rights

	Year Ended December 31,
(dollars in thousands)	2015		2014
Balance at beginning of year	$	25,191	$	13,278
Originations		1,786		1,237
Purchases		—		14,579
Amortization		(5,542)		(3,903)
Balance at end of year	$	21,435	$	25,191
Fair value of amortized MSRs at end of year	$	29,676	$	31,807
Balance of loans serviced for others	$	3,220,865	$	3,570,912

Schedule of quantitative assumptions used in determining lower of cost or fair value of MSRs

	2015				2014
			Weighted‑				Weighted‑
	Range		Average		Range		Average
Conditional prepayment rate	8.54% ‑ 16.50	%	9.20	%	9.13% ‑ 18.03	%	10.08	%
Life in years (of the MSR)	3.89 ‑ 7.42		6.36		3.78 ‑ 7.17		6.80
Weighted‑average coupon rate	4.02% ‑ 7.02	%	4.08	%	3.98% ‑ 7.07	%	4.14	%
Discount rate	10.50% ‑ 10.52	%	10.50	%	10.50% ‑ 10.52	%	10.50	%