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Segment Information - Results of Operations and Selected Financial Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | $ 42,029 | $ 40,256 |
Noninterest income | 23,562 | 22,535 |
Income before taxes | 20,537 | 20,547 |
Total Assets | 6,375,041 | 5,773,926 | 6,038,974
Operating Segments [Member] | Metropolitan Banks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | 13,787 | 14,011 |
Noninterest income | 3,413 | 3,190 |
Income before taxes | 7,790 | 8,937 |
Total Assets | 2,093,563 | 1,926,511 | 2,079,444
Operating Segments [Member] | Community Banks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | 27,241 | 25,144 |
Noninterest income | 12,266 | 11,545 |
Income before taxes | 15,077 | 14,077 |
Total Assets | 3,973,407 | 3,627,011 | 3,764,429
Operating Segments [Member] | Other Financial Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | 1,376 | 1,565 |
Noninterest income | 7,056 | 6,902 |
Income before taxes | 3,066 | 3,237 |
Total Assets | 113,732 | 109,887 | 103,656
Operating Segments [Member] | Executive, Operations & Support [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | (375) | (464) |
Noninterest income | 15,955 | 14,749 |
Income before taxes | 9,679 | 8,094 |
Total Assets | 816,489 | 690,318 | 703,294
Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) |  |  |
Noninterest income | (15,128) | (13,851) |
Income before taxes | (15,075) | (13,798) |
Total Assets | $ (622,150) | $ (579,801) | $ (611,849)

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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