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Loans - Loans Receivable (Parenthetical) (Detail) (USD $) | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total gross loans | $ 2,159,271,000 | $ 2,048,560,000 | $ 2,048,560,000
Commercial term includes owner-occupied property loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total gross loans | 816,000,000 | 774,200,000 |
Commercial lines of credit includes owner-occupied property loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total gross loans | 540,000.0 | 1,400,000 |
SBA loans includes owner-occupied property loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total gross loans | $ 145,000,000 | $ 128,400,000 |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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