Fair Value Of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Of Financial Instruments [Abstract]

Fair value of financial instruments [Table Text Block]

	Fair Value Hierarchy Level	September 30, 2016				December 31, 2015
(In thousands)		Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial Assets
Loans:
Business	Level 3	$	4,770,883	$	4,819,577	$	4,397,893	$	4,421,237
Real estate - construction and land	Level 3	800,545		810,403		624,070		633,083
Real estate - business	Level 3	2,520,528		2,561,306		2,355,544		2,387,101
Real estate - personal	Level 3	1,968,005		1,998,235		1,915,953		1,940,863
Consumer	Level 3	1,972,969		1,972,559		1,924,365		1,916,747
Revolving home equity	Level 3	417,591		419,543		432,981		434,607
Consumer credit card	Level 3	760,022		780,059		779,744		793,428
Overdrafts	Level 3	19,698		19,698		6,142		6,142
Loans held for sale	Level 2	9,511		9,511		7,607		7,607
Investment securities:
Available for sale	Level 1	778,694		778,694		747,339		747,339
Available for sale	Level 2	8,643,269		8,643,269		9,012,470		9,012,470
Available for sale	Level 3	16,908		16,908		17,195		17,195
Trading	Level 2	28,586		28,586		11,890		11,890
Non-marketable	Level 3	108,224		108,224		112,786		112,786
Federal funds sold	Level 1	13,415		13,415		14,505		14,505
Securities purchased under agreements to resell	Level 3	725,000		731,362		875,000		879,546
Interest earning deposits with banks	Level 1	56,767		56,767		23,803		23,803
Cash and due from banks	Level 1	396,938		396,938		464,411		464,411
Derivative instruments	Level 2	31,179		31,179		12,507		12,507
Derivative instruments	Level 3	877		877		264		264
Assets held in trust for deferred compensation plan	Level 1	10,028		10,028		9,278		9,278
Financial Liabilities
Non-interest bearing deposits	Level 1	$	7,130,415	$	7,130,415	$	7,146,398	$	7,146,398
Savings, interest checking and money market deposits	Level 1	11,023,526		11,023,526		10,834,746		10,834,746
Time open and certificates of deposit	Level 3	2,012,219		2,009,071		1,997,709		1,993,521
Federal funds purchased	Level 1	293,640		293,640		556,970		556,970
Securities sold under agreements to repurchase	Level 3	1,196,251		1,196,339		1,406,582		1,406,670
Other borrowings	Level 3	101,415		104,490		103,818		108,542
Derivative instruments	Level 2	31,500		31,500		12,534		12,534
Derivative instruments	Level 3	272		272		195		195
Liabilities held in trust for deferred compensation plan	Level 1	10,028		10,028		9,278		9,278