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Segment Information - Results of Operations and Selected Financial Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) | $ 41,921 | $ 40,712 | $ 40,630 | $ 40,256 | $ 42,297 | $ 40,832 | $ 40,869 | $ 40,817 | $ 163,519 | $ 164,815 | $ 156,897
Provision for loan losses | 454 | (12) | 516 | 300 | 2,446 | 233 | 248 | 173 | 1,258 | 3,100 | 4,515
Noninterest income | 22,235 | 23,652 | 21,733 | 22,535 | 21,800 | 22,116 | 20,364 | 23,437 | 90,155 | 87,717 | 76,961
Depreciation and amortization |  |  |  |  |  |  |  |  | 11,077 | 10,840 | 9,682
Other expenses |  |  |  |  |  |  |  |  | 160,497 | 159,588 | 148,964
Income before taxes |  |  |  |  |  |  |  |  | 80,842 | 79,004 | 70,697
Total assets | 6,038,974 |  |  |  | 6,022,250 |  |  |  | 6,038,974 | 6,022,250 | 5,608,825
Capital expenditures |  |  |  |  |  |  |  |  | 13,896 | 13,438 | 16,380
Operating Segments [Member] | Metropolitan Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 56,346 | 54,062 | 50,952
Provision for loan losses |  |  |  |  |  |  |  |  | (154) | 1,202 | 21
Noninterest income |  |  |  |  |  |  |  |  | 12,881 | 11,222 | 11,226
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,178 | 1,956 | 1,733
Other expenses |  |  |  |  |  |  |  |  | 31,396 | 29,511 | 29,527
Income before taxes |  |  |  |  |  |  |  |  | 35,807 | 32,615 | 30,897
Total assets | 2,079,444 |  |  |  | 1,996,539 |  |  |  | 2,079,444 | 1,996,539 | 1,738,426
Capital expenditures |  |  |  |  |  |  |  |  | 5,534 | 4,099 | 2,265
Operating Segments [Member] | Community Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 102,705 | 105,966 | 102,528
Provision for loan losses |  |  |  |  |  |  |  |  | 1,205 | 1,607 | 4,205
Noninterest income |  |  |  |  |  |  |  |  | 48,418 | 43,809 | 39,529
Depreciation and amortization |  |  |  |  |  |  |  |  | 7,011 | 6,898 | 6,128
Other expenses |  |  |  |  |  |  |  |  | 84,011 | 80,535 | 74,527
Income before taxes |  |  |  |  |  |  |  |  | 58,896 | 60,735 | 57,197
Total assets | 3,764,429 |  |  |  | 3,801,653 |  |  |  | 3,764,429 | 3,801,653 | 3,660,239
Capital expenditures |  |  |  |  |  |  |  |  | 6,445 | 8,045 | 12,561
Operating Segments [Member] | Other Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 6,239 | 7,055 | 7,055
Provision for loan losses |  |  |  |  |  |  |  |  | 121 | 182 | 276
Noninterest income |  |  |  |  |  |  |  |  | 25,659 | 29,624 | 23,148
Depreciation and amortization |  |  |  |  |  |  |  |  | 521 | 485 | 505
Other expenses |  |  |  |  |  |  |  |  | 21,604 | 22,056 | 19,569
Income before taxes |  |  |  |  |  |  |  |  | 9,652 | 13,956 | 9,853
Total assets | 103,656 |  |  |  | 186,473 |  |  |  | 103,656 | 186,473 | 153,872
Capital expenditures |  |  |  |  |  |  |  |  | 219 | 398 | 107
Operating Segments [Member] | Executive, Operations and Support [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | (1,771) | (2,268) | (3,638)
Provision for loan losses |  |  |  |  |  |  |  |  | 86 | 109 | 13
Noninterest income |  |  |  |  |  |  |  |  | 59,298 | 56,848 | 51,144
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,367 | 1,501 | 1,316
Other expenses |  |  |  |  |  |  |  |  | 23,818 | 27,783 | 25,627
Income before taxes |  |  |  |  |  |  |  |  | 32,256 | 25,187 | 20,550
Total assets | 703,294 |  |  |  | 602,342 |  |  |  | 703,294 | 602,342 | 602,577
Capital expenditures |  |  |  |  |  |  |  |  | 1,698 | 896 | 1,447
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | (56,101) | (53,786) | (48,086)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |
Other expenses |  |  |  |  |  |  |  |  | (332) | (297) | (286)
Income before taxes |  |  |  |  |  |  |  |  | (55,769) | (53,489) | (47,800)
Total assets | (611,849) |  |  |  | (564,757) |  |  |  | (611,849) | (564,757) | (546,289)
Capital expenditures |  |  |  |  |  |  |  |  |  |  |

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