Fair Value Of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Of Financial Instruments [Abstract]

Fair value of financial instruments [Table Text Block]

	Fair Value Hierarchy Level	September 30, 2017				December 31, 2016
(In thousands)		Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial Assets
Loans:
Business	Level 3	$	4,834,037	$	4,848,169	$	4,776,365	$	4,787,469
Real estate - construction and land	Level 3	921,609		933,862		791,236		800,426
Real estate - business	Level 3	2,700,174		2,712,002		2,643,374		2,658,093
Real estate - personal	Level 3	2,029,302		2,034,374		2,010,397		2,005,227
Consumer	Level 3	2,113,438		2,088,302		1,990,801		1,974,784
Revolving home equity	Level 3	391,308		391,419		413,634		414,499
Consumer credit card	Level 3	752,379		767,344		776,465		794,856
Overdrafts	Level 3	3,245		3,245		10,464		10,464
Loans held for sale	Level 2	17,337		17,337		14,456		14,456
Investment securities:
Available for sale	Level 1	951,519		951,519		945,871		945,871
Available for sale	Level 2	8,140,915		8,140,915		8,686,650		8,686,650
Available for sale	Level 3	16,853		16,853		16,682		16,682
Trading	Level 2	24,605		24,605		22,225		22,225
Non-marketable	Level 3	99,268		99,268		99,558		99,558
Federal funds sold	Level 1	32,630		32,630		15,470		15,470
Securities purchased under agreements to resell	Level 3	700,000		702,989		725,000		728,179
Interest earning deposits with banks	Level 1	105,422		105,422		272,275		272,275
Cash and due from banks	Level 1	461,724		461,724		494,690		494,690
Derivative instruments	Level 2	10,837		10,837		13,146		13,146
Derivative instruments	Level 3	813		813		420		420
Assets held in trust for deferred compensation plan	Level 1	12,311		12,311		10,261		10,261
Financial Liabilities
Non-interest bearing deposits	Level 1	$	7,536,127	$	7,536,127	$	7,429,398	$	7,429,398
Savings, interest checking and money market deposits	Level 1	11,091,200		11,091,200		11,430,789		11,430,789
Time open and certificates of deposit	Level 3	1,816,446		1,820,178		2,240,908		2,235,218
Federal funds purchased	Level 1	350,910		350,910		52,840		52,840
Securities sold under agreements to repurchase	Level 3	1,058,074		1,058,459		1,671,065		1,671,227
Other borrowings	Level 3	102,553		103,012		102,049		104,298
Derivative instruments	Level 2	5,850		5,850		13,177		13,177
Derivative instruments	Level 3	129		129		162		162
Liabilities held in trust for deferred compensation plan	Level 1	12,311		12,311		10,261		10,261