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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Segment Reporting Information [Line Items]        
Number of segments in which the business operates     3  
Net interest income $ 85,279 $ 85,680 $ 258,671 $ 259,885
Provision for loan losses, net 5,463 7,978 10,884 23,631
Noninterest income 44,865 44,272 132,410 127,075
Noninterest expense 83,460 85,481 257,193 246,847
Income before income taxes 41,221 36,493 123,004 116,482
Income taxes 11,317 9,525 33,431 33,899
Net income 29,904 26,968 89,573 82,583
Selected Financial Information [Abstract]        
Average assets 9,811,363 9,572,456 9,797,819 9,565,527
Depreciation and amortization 7,862 6,611 21,718 18,523
General Banking [Member]
        
Segment Reporting Information [Line Items]        
Net interest income 84,125 84,509 255,184 256,449
Provision for loan losses, net 5,448 7,984 10,849 23,624
Noninterest income 30,433 30,686 92,772 88,205
Noninterest expense 72,029 72,916 224,256 212,263
Income before income taxes 37,081 34,295 112,851 108,767
Income taxes 9,817 8,760 29,834 31,198
Net income 27,264 25,535 83,017 77,569
Selected Financial Information [Abstract]        
Average assets 9,664,428 9,423,743 9,653,259 9,417,382
Depreciation and amortization 7,514 6,207 20,649 17,276
Wealth Management [Member]
        
Segment Reporting Information [Line Items]        
Net interest income 1,065 1,094 3,254 3,234
Provision for loan losses, net 15 (6) 35 7
Noninterest income 6,895 6,078 18,327 18,000
Noninterest expense 5,957 6,819 16,894 17,946
Income before income taxes 1,988 359 4,652 3,281
Income taxes 701 71 1,549 1,047
Net income 1,287 288 3,103 2,234
Selected Financial Information [Abstract]        
Average assets 77,999 81,527 78,684 82,323
Depreciation and amortization 42 49 132 162
Insurance [Member]
        
Segment Reporting Information [Line Items]        
Net interest income 89 77 233 202
Provision for loan losses, net 0 0 0 0
Noninterest income 7,537 7,508 21,311 20,870
Noninterest expense 5,474 5,746 16,043 16,638
Income before income taxes 2,152 1,839 5,501 4,434
Income taxes 799 694 2,048 1,654
Net income 1,353 1,145 3,453 2,780
Selected Financial Information [Abstract]        
Average assets 68,936 67,186 65,876 65,822
Depreciation and amortization $ 306 $ 355 $ 937 $ 1,085