Commitments and contingent liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Payments Under Noncancelable Operating Leases

Future minimum lease payments as of December 31, 2018 under noncancellable operating leases are as follows:

	Future Lease Payments
	(Dollars in thousands)
2019	$	25,294
2020	23,216
2021	21,419
2022	19,460
2023	17,403
2024 and thereafter	41,368