Derivative financial instruments (Tables)

12 Months Ended

Dec. 31, 2016

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Information about Interest Rate Swap Agreements

Information about interest rate swap agreements entered into for interest rate risk management purposes summarized by type of financial instrument the swap agreements were intended to hedge follows:

	Notional		Average		Weighted- Average Rate						Estimated Fair
	Amount		Maturity		Fixed			Variable			Value Gain
	(In thousands)		(In years)								(In thousands)
December 31, 2016
Fair value hedges:
Fixed rate long-term borrowings(a)	$	900,000		1.1		3.75	%		2.08	%	$	11,892
December 31, 2015
Fair value hedges:
Fixed rate long-term borrowings(a)	$	1,400,000		1.7		4.42	%		1.39	%	$	43,892

(a) Under the terms of these agreements, the Company receives settlement amounts at a fixed rate and pays at a variable rate.

Notional Amount of Interest Rate Swap Agreements Outstanding Maturity

The notional amount of interest rate swap agreements entered into for risk management purposes that were outstanding at December 31, 2016 mature as follows:

	(In thousands)
Year ending December 31:
2017	$	400,000
2018		500,000
	$	900,000

Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet

Information about the fair values of derivative instruments in the Company’s consolidated balance sheet and consolidated statement of income follows:

	Asset Derivatives				Liability Derivatives
	Fair Value				Fair Value
	December 31				December 31
	2016		2015		2016		2015
	(In thousands)
Derivatives designated and qualifying as hedging instruments
Fair value hedges:
Interest rate swap agreements(a)	$	11,892	$	43,892	$	—	$	—
Commitments to sell real estate loans(a)		33,189		1,844		1,347		656
		45,081		45,736		1,347		656
Derivatives not designated and qualifying as hedging instruments
Mortgage-related commitments to originate real estate loans for    sale(a)		8,060		10,282		735		403
Commitments to sell real estate loans(a)		5,210		533		399		846
Trading:
Interest rate contracts(b)		228,810		203,517		167,737		153,723
Foreign exchange and other option and futures contracts(b)		7,908		8,569		6,639		7,022
		249,988		222,901		175,510		161,994
Total derivatives	$	295,069	$	268,637	$	176,857	$	162,650

(a) Asset derivatives are reported in other assets and liability derivatives are reported in other liabilities.

(b) Asset derivatives are reported in trading account assets and liability derivatives are reported in other liabilities.

Information about Fair Values of Derivative Instruments in Consolidated Statement of Income

	Amount of Gain (Loss) Recognized
	Year Ended December 31, 2016					Year Ended December 31, 2015					Year Ended December 31, 2014
	Derivative			Hedged Item		Derivative			Hedged Item		Derivative			Hedged Item
	(In thousands)
Derivatives in fair value hedging relationships
Interest rate swap agreements:
Fixed rate long-term borrowings(a)	$	(32,000	)		30,906	$	(29,359	)		28,719	$	(29,624	)		28,870
Derivatives not designated as hedging instruments
Trading:
Interest rate contracts(b)	$	14,042				$	10,755				$	3,398
Foreign exchange and other option and futures    contracts(b)		7,665					9,337					7,670
Total	$	21,707				$	20,092				$	11,068

(a) Reported as other revenues from operations.

(b) Reported as trading account and foreign exchange gains.