Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Company's Significant Commitments

The following table presents the Company’s significant commitments. Certain of these commitments are not included in the Company’s consolidated balance sheet.

	December 31
	2017		2016
	(In thousands)
Commitments to extend credit
Home equity lines of credit	$	5,482,622		5,499,609
Commercial real estate loans to be sold		194,763		70,100
Other commercial real estate		6,050,569		6,451,709
Residential real estate loans to be sold		347,113		478,950
Other residential real estate		201,426		232,721
Commercial and other		12,733,815		12,298,473
Standby letters of credit		2,497,844		2,987,091
Commercial letters of credit		46,739		44,723
Financial guarantees and indemnification contracts		3,434,381		3,043,580
Commitments to sell real estate loans		812,217		1,489,237

Minimum Lease Payments Under Noncancelable Operating Leases

Minimum lease payments under noncancelable operating leases are summarized in the following table:

	(In thousands)
Year ending December 31:
2018	$	92,824
2019		87,298
2020		70,490
2021		54,685
2022		41,953
Later years		82,195
	$	429,445