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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)

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