Other Assets (Tables)

12 Months Ended

Dec. 31, 2017

Other Assets

Schedule of carrying amount of goodwill reported in reporting units

	Retail		Commercial
(in thousands)	Banking		Banking		Total
December 31, 2017	$	687,492	$	308,000	$	995,492
December 31, 2016		687,492		308,000		995,492

Schedule of estimated future amortization expense for mortgage servicing assets

	Estimated
(dollars in thousands)	Amortization
Year ending December 31:
2018	$	1,959
2019		1,702
2020		1,486
2021		1,297
2022		1,133

Schedule of gross carrying values, accumulated amortization, and net carrying values of mortgage servicing assets

	December 31,
(dollars in thousands)	2017		2016
Gross carrying amount	$	56,571	$	56,544
Less: accumulated amortization		43,375		39,735
Net carrying value	$	13,196	$	16,809

Schedule of changes in amortized mortgage servicing assets

	Year Ended December 31,
(dollars in thousands)	2017		2016
Balance at beginning of year	$	16,809	$	21,435
Originations		27		65
Amortization		(3,640)		(4,691)
Balance at end of year	$	13,196	$	16,809
Fair value of amortized MSRs at beginning of year	$	25,160	$	29,676
Fair value of amortized MSRs at end of year	$	21,697	$	25,160
Balance of loans serviced for others	$	2,342,619	$	2,702,489

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

	2017							2016
						Weighted							Weighted
	Range					Average		Range					Average
Conditional prepayment rate	8.53	%	-	19.63	%	9.04	%	8.61	%	-	18.01	%	9.16	%
Life in years (of the MSR)	3.29		-	7.15		6.76		3.75		-	7.26		6.19
Weighted-average coupon rate	3.97	%	-	6.79	%	4.04	%	3.99	%	-	6.87	%	4.06	%
Discount rate	10.50	%	-	10.52	%	10.50	%	10.46	%	-	10.52	%	10.50	%