Other Assets (Tables)

12 Months Ended

Dec. 31, 2018

Other Assets

Schedule of carrying amount of goodwill reported in reporting units

	Retail		Commercial
(in thousands)	Banking		Banking		Total
December 31, 2018	$	687,492	$	308,000	$	995,492
December 31, 2017		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:
2019	$	2,318
2020		2,048
2021		1,807
2022		1,592
2023		1,403

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

	December 31,
(dollars in thousands)	2018		2017
Gross carrying amount	$	63,342	$	56,571
Less: accumulated amortization		47,187		43,375
Net carrying value	$	16,155	$	13,196

Schedule of changes in amortized mortgage servicing assets

	Year Ended December 31,
(dollars in thousands)	2018		2017
Balance at beginning of year	$	13,196	$	16,809
Originations		328		27
Purchases		6,444		—
Amortization		(3,813)		(3,640)
Balance at end of year	$	16,155	$	13,196
Fair value of amortized MSRs at beginning of year	$	21,697	$	25,160
Fair value of amortized MSRs at end of year	$	27,662	$	21,697
Balance of loans serviced for others	$	2,664,860	$	2,342,619

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

	December 31, 2018							December 31, 2017
						Weighted							Weighted
	Range					Average		Range					Average
Conditional prepayment rate	7.86	%	-	19.26	%	8.31	%	8.53	%	-	19.63	%	9.04	%
Life in years (of the MSR)	3.43		-	7.68		7.19		3.29		-	7.15		6.76
Weighted-average coupon rate	3.97	%	-	6.70	%	4.02	%	3.97	%	-	6.79	%	4.04	%
Discount rate	10.00	%	-	10.02	%	10.00	%	10.50	%	-	10.52	%	10.50	%