Income Taxes (Components Of The Net Deferred Tax (Liabilities) Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets, Gross [Abstract]
Allowance for loan and lease losses	$ 36,566	$ 52,360
Accrued severance and deferred compensation	17,497	25,565
Tax credit carryforwards	12,252	21,037
Unrealized losses on investment securities	5,158	9,275
Deferred Tax Assets, Loan Discount	3,565	16,623
Net operating loss carryforwards	2,159	48,121
Other	16,890	33,872
Total gross deferred tax assets	94,087	206,853
Deferred Tax Liabilities, Gross [Abstract]
Residential mortgage servicing rights	40,414	57,858
Fair market value adjustment on junior subordinated debentures	26,538	45,958
Leases	19,673	8,259
Deferred loan fees and costs	18,146	23,800
Intangibles	12,969	18,710
Other	12,760	16,856
Total gross deferred tax liabilities	130,500	171,441
Valuation allowance	(1,090)	(1,090)
Deferred Tax Liabilities, Net	(37,503)	0
Net deferred tax (liabilities) assets	$ 0	$ 34,322