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Segment Information (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
Dec. 31, 2011
Dec. 31, 2010
Results of operations and selected financial information                      
Net interest income (expense) $ 42,297 $ 40,832 $ 40,869 $ 40,817 $ 41,384 $ 40,218 $ 38,006 $ 37,289 $ 164,815 $ 156,897 $ 142,757
Provision for loan losses 2,446 233 248 173 829 885 2,013 788 3,100 4,515 2,954
Noninterest income 21,800 22,116 20,364 23,437 19,435 20,117 19,679 17,730 87,717 76,961 69,938
Depreciation and amortization                 10,840 9,682 8,531
Other expenses                 159,588 148,964 135,564
Income before taxes                 79,004 70,697 65,646
Total assets 6,022,250       5,608,825       6,022,250 5,608,825 5,060,249
Capital expenditures                 13,438 16,380 7,508
Metropolitan Banks [Member]
                      
Results of operations and selected financial information                      
Net interest income (expense)                 54,062 50,952 46,928
Provision for loan losses                 1,202 21 528
Noninterest income                 11,222 11,226 10,687
Depreciation and amortization                 1,956 1,733 1,628
Other expenses                 29,511 29,527 26,738
Income before taxes                 32,615 30,897 28,721
Total assets 1,996,539       1,738,426       1,996,539 1,738,426 1,534,552
Capital expenditures                 4,099 2,265 1,614
Community Banks [Member]
                      
Results of operations and selected financial information                      
Net interest income (expense)                 105,966 102,528 91,730
Provision for loan losses                 1,607 4,205 2,199
Noninterest income                 43,809 39,529 35,818
Depreciation and amortization                 6,898 6,128 5,269
Other expenses                 80,535 74,527 66,838
Income before taxes                 60,735 57,197 53,242
Total assets 3,801,653       3,660,239       3,801,653 3,660,239 3,298,409
Capital expenditures                 8,045 12,561 4,584
Other Financial Services [Member]
                      
Results of operations and selected financial information                      
Net interest income (expense)                 7,055 7,055 7,489
Provision for loan losses                 182 276 228
Noninterest income                 29,624 23,148 20,822
Depreciation and amortization                 485 505 502
Other expenses                 22,056 19,569 18,394
Income before taxes                 13,956 9,853 9,187
Total assets 186,473       153,872       186,473 153,872 140,854
Capital expenditures                 398 107 162
Executive, Operations and Support [Member]
                      
Results of operations and selected financial information                      
Net interest income (expense)                 (2,268) (3,638) (3,390)
Provision for loan losses                 109 13 (1)
Noninterest income                 56,848 51,144 46,809
Depreciation and amortization                 1,501 1,316 1,132
Other expenses                 27,783 25,627 23,879
Income before taxes                 25,187 20,550 18,409
Total assets 602,342       602,577       602,342 602,577 611,979
Capital expenditures                 896 1,447 1,148
Eliminations [Member]
                      
Results of operations and selected financial information                      
Noninterest income                 (53,786) (48,086) (44,198)
Other expenses                 (297) (286) (285)
Income before taxes                 (53,489) (47,800) (43,913)
Total assets $ (564,757)       $ (546,289)       $ (564,757) $ (546,289) $ (525,545)