Borrowings (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018
Amount outstanding	$	198,378		$	4,200,000		$	4,398,378
Weighted-average interest rate		1.68	%		2.63	%		2.58	%
For the year ended December 31, 2018
Highest amount at a month-end	$	2,654,416		$	4,200,000
Daily-average amount outstanding		261,200			69,465		$	330,665
Weighted-average interest rate		1.49	%		2.16	%		1.63	%
At December 31, 2017
Amount outstanding	$	175,099		$	—		$	175,099
Weighted-average interest rate		0.92	%		—			0.92	%
For the year ended December 31, 2017
Highest amount at a month-end	$	204,977		$	1,500,000
Daily-average amount outstanding		188,459			16,164		$	204,623
Weighted-average interest rate		0.69	%		1.27	%		0.74	%
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	%

Lines of Credit Under Formal Agreements

At December 31, 2018, M&T Bank had lines of credit under formal agreements as follows:

	(In thousands)
Outstanding borrowings	$	4,776,510
Unused		27,637,030

Long-term Borrowings

Long-term borrowings were as follows:

	December 31,
	2018		2017
	(In thousands)
Senior notes of M&T Bank Corporation:
Variable rate due 2023	$	249,688	$	—
3.55% due 2023		506,021		—
Senior notes of M&T Bank:
Variable rate due 2021		349,794		—
Variable rate due 2022		249,658		249,558
1.45% due 2018		—		499,907
2.25% due 2019		645,801		644,977
2.30% due 2019		—		746,919
2.05% due 2020		737,793		739,961
2.10% due 2020		741,965		743,788
2.625% due 2021		646,301		—
2.50% due 2022		634,525		638,872
2.90% due 2025		749,488		749,404
Advances from FHLB:
Fixed rates		576,446		576,876
Agreements to repurchase securities		409,154		421,771
Subordinated notes of Wilmington Trust Corporation (a wholly    owned subsidiary of M&T):
8.50% due 2018		—		200,000
Subordinated notes of M&T Bank:
Variable rate due 2020		409,361		409,361
Variable rate due 2021		500,000		500,000
3.40% due 2027		481,692		491,176
Junior subordinated debentures of M&T associated with preferred    capital securities:
Fixed rates:
BSB Capital Trust I — 8.125%, due 2028		15,705		15,682
Provident Trust I — 8.29%, due 2028		27,489		26,847
Southern Financial Statutory Trust I — 10.60%, due 2030		6,713		6,664
Variable rates:
First Maryland Capital I — due 2027		147,333		146,794
First Maryland Capital II — due 2027		149,280		148,617
Allfirst Asset Trust — due 2029		96,785		96,640
BSB Capital Trust III — due 2033		15,464		15,464
Provident Statutory Trust III — due 2033		55,143		54,466
Southern Financial Capital Trust III — due 2033		8,141		8,051
Other		35,174		9,635
	$	8,444,914	$	8,141,430

Maturity of Long-term Borrowings

Long-term borrowings at December 31, 2018 mature as follows:

	(In thousands)
Year ending December 31:
2019	$	1,525,057
2020		1,994,450
2021		1,522,796
2022		891,731
2023		755,710
Later years		1,755,170
	$	8,444,914