Fair Value Of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Of Financial Instruments [Abstract]

Fair value of financial instruments [Table Text Block]

	Fair Value Hierarchy Level	March 31, 2016				December 31, 2015
(In thousands)		Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial Assets
Loans:
Business	Level 3	$	4,575,081	$	4,626,980	$	4,397,893	$	4,421,237
Real estate - construction and land	Level 3	745,369		754,959		624,070		633,083
Real estate - business	Level 3	2,395,933		2,442,752		2,355,544		2,387,101
Real estate - personal	Level 3	1,903,969		1,948,143		1,915,953		1,940,863
Consumer	Level 3	1,904,320		1,907,623		1,924,365		1,916,747
Revolving home equity	Level 3	423,005		425,568		432,981		434,607
Consumer credit card	Level 3	744,364		760,353		779,744		793,428
Overdrafts	Level 3	5,829		5,829		6,142		6,142
Loans held for sale	Level 2	60,078		60,092		7,607		7,607
Investment securities:
Available for sale	Level 1	736,527		736,527		747,339		747,339
Available for sale	Level 2	8,798,443		8,798,443		9,012,470		9,012,470
Available for sale	Level 3	17,209		17,209		17,195		17,195
Trading	Level 2	23,130		23,130		11,890		11,890
Non-marketable	Level 3	117,259		117,259		112,786		112,786
Federal funds sold	Level 1	9,075		9,075		14,505		14,505
Securities purchased under agreements to resell	Level 3	825,000		832,942		875,000		879,546
Interest earning deposits with banks	Level 1	171,651		171,651		23,803		23,803
Cash and due from banks	Level 1	375,481		375,481		464,411		464,411
Derivative instruments	Level 2	26,796		26,796		12,507		12,507
Derivative instruments	Level 3	772		772		264		264
Financial Liabilities
Non-interest bearing deposits	Level 1	$	7,065,066	$	7,065,066	$	7,146,398	$	7,146,398
Savings, interest checking and money market deposits	Level 1	11,205,357		11,205,357		10,834,746		10,834,746
Time open and certificates of deposit	Level 3	2,415,886		2,414,609		1,997,709		1,993,521
Federal funds purchased	Level 1	3,885		3,885		556,970		556,970
Securities sold under agreements to repurchase	Level 3	953,503		953,589		1,406,582		1,406,670
Other borrowings	Level 3	103,806		108,456		103,818		108,542
Derivative instruments	Level 2	26,929		26,929		12,534		12,534
Derivative instruments	Level 3	266		266		195		195