Borrowings (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Amounts and Interest Rates of Short-term Borrowings

The amounts and interest rates of short-term borrowings were as follows:

	Federal Funds Purchased and Repurchase Agreements			Other Short-term Borrowings			Total
	(Dollars in thousands)
At December 31, 2016
Amount outstanding	$	163,442			—		$	163,442
Weighted-average interest rate		0.32	%		—			0.32	%
For the year ended December 31, 2016
Highest amount at a month-end	$	225,940		$	1,974,013
Daily-average amount outstanding		203,853			689,969		$	893,822
Weighted-average interest rate		0.28	%		0.44	%		0.41	%
At December 31, 2015
Amount outstanding	$	150,546		$	1,981,636		$	2,132,182
Weighted-average interest rate		0.06	%		0.43	%		0.40	%
For the year ended December 31, 2015
Highest amount at a month-end	$	202,951		$	1,989,257
Daily-average amount outstanding		187,167			360,838		$	548,005
Weighted-average interest rate		0.08	%		0.43	%		0.31	%
At December 31, 2014
Amount outstanding	$	192,676			—		$	192,676
Weighted-average interest rate		0.07	%		—			0.07	%
For the year ended December 31, 2014
Highest amount at a month-end	$	280,350			—
Daily-average amount outstanding		214,736			—		$	214,736
Weighted-average interest rate		0.05	%		—			0.05	%

Lines of Credit Under Formal Agreements

At December 31, 2016, M&T Bank had lines of credit under formal agreements as follows:

	(In thousands)
Outstanding borrowings	$	1,154,828
Unused		32,573,956

Long-term Borrowings

Long-term borrowings were as follows:

	December 31,
	2016		2015
	(In thousands)
Senior notes of M&T Bank:
Variable rate due 2016	$	—	$	300,000
Variable rate due 2017		550,000		550,000
1.25% due 2017		499,999		499,984
1.40% due 2017		749,946		749,851
1.45% due 2018		501,829		503,527
2.25% due 2019		649,012		648,628
2.30% due 2019		749,473		749,219
2.10% due 2020		749,735		749,650
2.90% due 2025		749,320		749,236
Advances from FHLB:
Fixed rates		1,154,737		1,158,216
Agreements to repurchase securities		1,084,694		1,899,281
Subordinated notes of Wilmington Trust Corporation (a wholly    owned subsidiary of M&T):
8.50% due 2018		207,651		213,417
Subordinated notes of M&T Bank:
6.625% due 2017		409,526		419,800
5.585% due 2020, variable rate commenced 2015		409,361		409,361
5.629% due 2021, variable rate commenced 2016		500,000		518,797
Junior subordinated debentures of M&T associated with preferred    capital securities:
Fixed rates:
BSB Capital Trust I — 8.125%, due 2028		15,659		15,635
Provident Trust I — 8.29%, due 2028		26,293		25,817
Southern Financial Statutory Trust I — 10.60%, due 2030		6,620		6,583
Variable rates:
First Maryland Capital I — due 2027		146,256		145,717
First Maryland Capital II — due 2027		147,954		147,291
Allfirst Asset Trust — due 2029		96,494		96,349
BSB Capital Trust III — due 2033		15,464		15,464
Provident Statutory Trust III — due 2033		53,834		53,244
Southern Financial Capital Trust III — due 2033		7,968		7,889
Other		12,010		20,902
	$	9,493,835	$	10,653,858

Maturity of Long-term Borrowings

Long-term borrowings at December 31, 2016 mature as follows:

	(In thousands)
Year ending December 31:
2017	$	3,442,484
2018		714,358
2019		2,299,502
2020		1,269,939
2021		500,144
Later years		1,267,408
	$	9,493,835