Fair Value Of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Of Financial Instruments [Abstract]

Fair value of financial instruments [Table Text Block]

	Fair Value Hierarchy Level	June 30, 2017				December 31, 2016
(In thousands)		Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial Assets
Loans:
Business	Level 3	$	4,852,408	$	4,866,125	$	4,776,365	$	4,787,469
Real estate - construction and land	Level 3	848,152		859,171		791,236		800,426
Real estate - business	Level 3	2,727,349		2,740,841		2,643,374		2,658,093
Real estate - personal	Level 3	2,009,203		2,022,671		2,010,397		2,005,227
Consumer	Level 3	2,038,514		2,021,537		1,990,801		1,974,784
Revolving home equity	Level 3	403,387		404,177		413,634		414,499
Consumer credit card	Level 3	740,865		754,763		776,465		794,856
Overdrafts	Level 3	6,714		6,714		10,464		10,464
Loans held for sale	Level 2	22,002		22,002		14,456		14,456
Investment securities:
Available for sale	Level 1	933,711		933,711		945,871		945,871
Available for sale	Level 2	8,489,165		8,489,165		8,686,650		8,686,650
Available for sale	Level 3	16,825		16,825		16,682		16,682
Trading	Level 2	22,291		22,291		22,225		22,225
Non-marketable	Level 3	102,388		102,388		99,558		99,558
Federal funds sold	Level 1	16,520		16,520		15,470		15,470
Securities purchased under agreements to resell	Level 3	625,000		628,148		725,000		728,179
Interest earning deposits with banks	Level 1	80,860		80,860		272,275		272,275
Cash and due from banks	Level 1	433,747		433,747		494,690		494,690
Derivative instruments	Level 2	11,097		11,097		13,146		13,146
Derivative instruments	Level 3	930		930		420		420
Assets held in trust for deferred compensation plan	Level 1	11,893		11,893		10,261		10,261
Financial Liabilities
Non-interest bearing deposits	Level 1	$	7,314,506	$	7,314,506	$	7,429,398	$	7,429,398
Savings, interest checking and money market deposits	Level 1	11,427,615		11,427,615		11,430,789		11,430,789
Time open and certificates of deposit	Level 3	2,083,541		2,075,563		2,240,908		2,235,218
Federal funds purchased	Level 1	253,510		253,510		52,840		52,840
Securities sold under agreements to repurchase	Level 3	1,002,934		1,003,183		1,671,065		1,671,227
Other borrowings	Level 3	101,903		102,907		102,049		104,298
Derivative instruments	Level 2	6,108		6,108		13,177		13,177
Derivative instruments	Level 3	139		139		162		162
Liabilities held in trust for deferred compensation plan	Level 1	11,893		11,893		10,261		10,261