Fair Value Of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Of Financial Instruments [Abstract]

Fair value of financial instruments [Table Text Block]

	Fair Value Hierarchy Level	June 30, 2016				December 31, 2015
(In thousands)		Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial Assets
Loans:
Business	Level 3	$	4,840,248	$	4,902,110	$	4,397,893	$	4,421,237
Real estate - construction and land	Level 3	819,896		829,857		624,070		633,083
Real estate - business	Level 3	2,399,271		2,448,134		2,355,544		2,387,101
Real estate - personal	Level 3	1,927,340		1,976,674		1,915,953		1,940,863
Consumer	Level 3	1,939,486		1,943,943		1,924,365		1,916,747
Revolving home equity	Level 3	408,301		410,995		432,981		434,607
Consumer credit card	Level 3	753,166		769,991		779,744		793,428
Overdrafts	Level 3	4,180		4,180		6,142		6,142
Loans held for sale	Level 2	33,254		33,337		7,607		7,607
Investment securities:
Available for sale	Level 1	742,966		742,966		747,339		747,339
Available for sale	Level 2	8,460,701		8,460,701		9,012,470		9,012,470
Available for sale	Level 3	17,679		17,679		17,195		17,195
Trading	Level 2	30,512		30,512		11,890		11,890
Non-marketable	Level 3	111,931		111,931		112,786		112,786
Federal funds sold	Level 1	13,725		13,725		14,505		14,505
Securities purchased under agreements to resell	Level 3	825,000		833,366		875,000		879,546
Interest earning deposits with banks	Level 1	183,223		183,223		23,803		23,803
Cash and due from banks	Level 1	428,300		428,300		464,411		464,411
Derivative instruments	Level 2	34,464		34,464		12,507		12,507
Derivative instruments	Level 3	791		791		264		264
Assets held in trust for deferred compensation plan	Level 1	9,701		9,701		9,278		9,278
Financial Liabilities
Non-interest bearing deposits	Level 1	$	6,906,265	$	6,906,265	$	7,146,398	$	7,146,398
Savings, interest checking and money market deposits	Level 1	10,978,734		10,978,734		10,834,746		10,834,746
Time open and certificates of deposit	Level 3	2,265,048		2,264,742		1,997,709		1,993,521
Federal funds purchased	Level 1	31,810		31,810		556,970		556,970
Securities sold under agreements to repurchase	Level 3	1,600,462		1,600,553		1,406,582		1,406,670
Other borrowings	Level 3	103,878		107,967		103,818		108,542
Derivative instruments	Level 2	34,717		34,717		12,534		12,534
Derivative instruments	Level 3	289		289		195		195
Liabilities held in trust for deferred compensation plan	Level 1	9,701		9,701		9,278		9,278