Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Allowance for credit losses	$ 35,455	$ 37,525
Net unrealized losses on derivatives included in other comprehensive income	1,601	1,574
Net unrealized losses on securities included in other comprehensive income	6,242	35,216
Deferred compensation	19,349	16,089
Stock-based compensation	10,735	10,340
Nonaccrued interest	1,329	1,895
Other real estate owned	7,546	6,405
Mortgage banking recourse obligation	1,206	1,503
Covered assets	18,246	13,616
Pension plan liabilities	465	1,035
Federal net operating loss carryforward	2,108	2,452
Foreign net operating loss carryforward	2,521	0
AMT credt carryforward	1,177	1,346
State tax losses carryforward	0	3,294
Foreign tax credit carryfoward	302	0
Other	3,058	2,149
Total gross deferred tax assets	111,340	134,439
Deferred tax liabilities:
Discount on purchased loans	11,324	5,718
Premises and equipment	35,902	36,847
Goodwill and intangible assets	3,501	1,683
Deferred loan fees and costs	4,927	4,533
FHLB stock dividends	1,416	1,431
Capitalized servicing rights	3,037	3,547
Fair value adjustments on loans	9,444	6,947
Other	5,625	3,606
Total gross deferred liabilities	75,176	64,312
Net deferred tax assets	$ 36,164	$ 70,127