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Intangible Assets - Summary of Goodwill By Business Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013
Goodwill [Line Items] |  |
Balance at beginning of period | $ 44,545 | $ 44,545
Acquisitions | 573 |
Balance at end of period | 45,118 | 44,545
Metropolitan Banks [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 8,079 |
Acquisitions |  |
Balance at end of period | 8,079 |
Community Banks [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 30,552 |
Acquisitions | 573 |
Balance at end of period | 31,125 |
Other Financial Services [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 5,464 |
Acquisitions |  |
Balance at end of period | 5,464 |
Executive, Operations & Support [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 450 |
Acquisitions |  |
Balance at end of period | $ 450 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e961-128460 + Details
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