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Segment Information (Summary Of Certain Operating Information For Reportable Segments) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
subsidiary
segment
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Number of reportable segments                 3    
Number of bank subsidiaries that management monitors                 15    
Net interest income $ 132,776 $ 132,575 $ 128,270 $ 125,895 $ 124,647 $ 118,410 $ 108,706 $ 109,614 $ 519,516 $ 461,377 $ 415,836
Provision for credit losses 19,546 18,799 20,691 17,400 18,817 29,290 29,187 25,344 76,436 102,638 124,664
Noninterest income                 226,092 189,698 192,160
Noninterest expense 129,548 124,548 117,185 117,759 118,768 106,321 97,206 98,109 489,040 420,404 382,525
Income tax expense 18,782 19,871 15,734 14,549 12,753 19,844 7,215 10,646 68,936 50,458 37,478
Net income 30,089 32,302 25,595 23,210 19,221 30,202 11,750 16,402 111,196 77,575 63,329
Total assets at end of year 17,519,613       15,893,808       17,519,613 15,893,808 13,980,156
Community Banking [Member]
                     
Segment Reporting Information [Line Items]                      
Number of reportable segments                 1    
Net interest income                 494,679 428,068 386,594
Provision for credit losses                 66,367 102,544 105,018
Noninterest income                 166,278 140,392 133,110
Noninterest expense                 385,427 331,006 304,223
Income tax expense                 79,531 51,338 39,032
Net income                 129,632 83,572 71,431
Total assets at end of year 17,213,511       15,188,133       17,213,511 15,188,133 13,258,238
Specialty Finance [Member]
                     
Segment Reporting Information [Line Items]                      
Net interest income                 123,313 112,508 89,870
Provision for credit losses                 2,882 864 22,586
Noninterest income                 3,518 3,071 13,643
Noninterest expense                 32,179 28,876 27,021
Income tax expense                 41,332 39,427 21,367
Net income                 50,438 46,412 32,539
Total assets at end of year 3,882,307       3,271,323       3,882,307 3,271,323 2,944,388
Wealth Management [Member]
                     
Segment Reporting Information [Line Items]                      
Net interest income                 4,946 8,460 12,275
Provision for credit losses                 0 0 0
Noninterest income                 63,697 54,940 45,447
Noninterest expense                 57,999 51,431 46,576
Income tax expense                 4,174 4,879 4,257
Net income                 6,470 7,090 6,889
Total assets at end of year 92,580       92,089       92,580 92,089 65,274
Parent And Intersegment Eliminations [Member]
                     
Segment Reporting Information [Line Items]                      
Net interest income                 (103,422) (87,659) (72,903)
Provision for credit losses                 7,187 (770) (2,940)
Noninterest income                 (7,401) (8,705) (40)
Noninterest expense                 13,435 9,091 4,705
Income tax expense                 (56,101) (45,186) (27,178)
Net income                 (75,344) (59,499) (47,530)
Total assets at end of year $ (3,668,785)       $ (2,657,737)       $ (3,668,785) $ (2,657,737) $ (2,287,744)