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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		$ 507,569		$ 534,086
Overnight investments		2,276,080		2,063,132
Investment securities available for sale		6,557,580		6,861,293
Investment securities held to maturity		156		255
Loans held for sale		84,795		59,766
Loans and Leases Receivable, Net Amount		20,534,563		20,033,774
FDIC Indemnification Asset		5,281	$ 7,474	4,054	$ 5,808	$ 21,340	$ 28,701
Income earned not collected		71,916		70,036
Mortgage servicing rights		16,824	$ 17,186	19,351	$ 18,162	$ 16,436	$ 16,688
Deposits		27,257,774		26,930,755
FDIC loss share payable		94,252		126,453
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		507,569		534,086
Overnight investments		2,276,080		2,063,132
Investment securities available for sale		6,557,580		6,861,293
Investment securities held to maturity		156		255
Loans held for sale		84,795		59,766
Loans and Leases Receivable, Net Amount		20,534,563		20,033,774
FDIC Indemnification Asset	[1]	5,281		4,054
Income earned not collected		71,916		70,036
Stock issued by Federal Home Loan Bank		43,495		37,511
Mortgage servicing rights		16,824		19,351
Deposits		27,257,774		26,930,755
Short-term borrowings		728,562		594,733
Long-term obligations		850,504		704,155
FDIC loss share payable		94,252		126,453
Accrued interest payable		6,337		5,713
Interest rate swap		0		1,429
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		507,569		534,086
Overnight investments		2,276,080		2,063,132
Investment securities available for sale		6,557,580		6,861,293
Investment securities held to maturity		165		265
Loans held for sale		84,795		59,766
Loans and Leases Receivable, Net Amount		20,089,558		19,353,325
FDIC Indemnification Asset	[1]	5,281		4,054
Income earned not collected		71,916		70,036
Stock issued by Federal Home Loan Bank		43,495		37,511
Mortgage servicing rights		16,884		19,495
Deposits		26,819,080		26,164,472
Short-term borrowings		728,562		594,733
Long-term obligations		888,551		718,102
FDIC loss share payable		100,339		131,894
Accrued interest payable		6,337		5,713
Interest rate swap		$ 0		$ 1,429
[1] (1) The interest rate swap agreement expired in June 2016.

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Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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