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Loans - Credit Quality of Loan Portfolio (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | $ 2,349,235 | $ 2,234,089 | $ 2,187,389
Real estate loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 2,090,083 | 1,969,798 | 1,964,853
Real estate loans [Member] | Retail [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 561,654 | 543,619 |
Real estate loans [Member] | Hotel/Motel [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 338,128 | 322,927 |
Real estate loans [Member] | Gas station [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 283,097 | 292,557 |
Real estate loans [Member] | Other [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 797,176 | 731,617 |
Real estate loans [Member] | Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 1,467 |  |
Real estate loans [Member] | Residential property [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 108,561 | 79,078 |
Commercial and industrial loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 230,309 | 231,786 | 187,156
Commercial and industrial loans [Member] | Commercial term [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 115,493 | 124,391 |
Commercial and industrial loans [Member] | Commercial lines of credit [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 70,801 | 71,042 |
Commercial and industrial loans [Member] | International loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 44,015 | 36,353 |
Consumer loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 28,843 | 32,505 | 35,380
Pass/Pass-Watch (Grade 0-4) [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 2,273,966 | 2,130,392 |
Pass/Pass-Watch (Grade 0-4) [Member] | Real estate loans [Member] | Retail [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 549,750 | 531,014 |
Pass/Pass-Watch (Grade 0-4) [Member] | Real estate loans [Member] | Hotel/Motel [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 325,745 | 308,483 |
Pass/Pass-Watch (Grade 0-4) [Member] | Real estate loans [Member] | Gas station [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 273,300 | 279,636 |
Pass/Pass-Watch (Grade 0-4) [Member] | Real estate loans [Member] | Other [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 773,540 | 690,481 |
Pass/Pass-Watch (Grade 0-4) [Member] | Real estate loans [Member] | Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 1,467 |  |
Pass/Pass-Watch (Grade 0-4) [Member] | Real estate loans [Member] | Residential property [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 106,801 | 77,422 |
Pass/Pass-Watch (Grade 0-4) [Member] | Commercial and industrial loans [Member] | Commercial term [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 103,734 | 107,712 |
Pass/Pass-Watch (Grade 0-4) [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 69,070 | 69,823 |
Pass/Pass-Watch (Grade 0-4) [Member] | Commercial and industrial loans [Member] | International loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 43,764 | 35,777 |
Pass/Pass-Watch (Grade 0-4) [Member] | Consumer loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 26,795 | 30,044 |
Criticized (Grade 5) [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 29,112 | 21,479 |
Criticized (Grade 5) [Member] | Real estate loans [Member] | Retail [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 6,625 | 5,309 |
Criticized (Grade 5) [Member] | Real estate loans [Member] | Hotel/Motel [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 7,386 | 1,796 |
Criticized (Grade 5) [Member] | Real estate loans [Member] | Gas station [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 1,846 | 3,104 |
Criticized (Grade 5) [Member] | Real estate loans [Member] | Other [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 10,903 | 8,524 |
Criticized (Grade 5) [Member] | Commercial and industrial loans [Member] | Commercial term [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 1,953 | 2,007 |
Criticized (Grade 5) [Member] | Commercial and industrial loans [Member] | International loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 251 | 576 |
Criticized (Grade 5) [Member] | Consumer loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 148 | 163 |
Classified (Grade 6-7) [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 46,157 | 82,218 |
Classified (Grade 6-7) [Member] | Real estate loans [Member] | Retail [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 5,279 | 7,296 |
Classified (Grade 6-7) [Member] | Real estate loans [Member] | Hotel/Motel [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 4,997 | 12,648 |
Classified (Grade 6-7) [Member] | Real estate loans [Member] | Gas station [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 7,951 | 9,817 |
Classified (Grade 6-7) [Member] | Real estate loans [Member] | Other [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 12,733 | 32,612 |
Classified (Grade 6-7) [Member] | Real estate loans [Member] | Residential property [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 1,760 | 1,656 |
Classified (Grade 6-7) [Member] | Commercial and industrial loans [Member] | Commercial term [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 9,806 | 14,672 |
Classified (Grade 6-7) [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | 1,731 | 1,219 |
Classified (Grade 6-7) [Member] | Consumer loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total gross loans | $ 1,900 | $ 2,298 |

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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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