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Loans, net and allowance for loan losses - Major Classifications of Loans by Past Due Status (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | $ 4,395 | $ 7,167
60-89 Days Past Due | 1,411 | 1,478
Greater than 90 Days | 14,585 | 16,321
Total Past Due | 20,391 | 24,966
Current | 1,156,731 | 1,151,651
Total Loans | 1,177,122 | 1,176,617
Loans > 90 Days and Accruing | 1,663 | 1,455
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 809 | 1,052
60-89 Days Past Due | 689 | 105
Greater than 90 Days | 1,171 | 2,041
Total Past Due | 2,669 | 3,198
Current | 356,060 | 347,482
Total Loans | 358,729 | 350,680
Loans > 90 Days and Accruing | 7 | 6
Real Estate Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 268 | 1,641
60-89 Days Past Due | 210 | 75
Greater than 90 Days | 8,865 | 9,372
Total Past Due | 9,343 | 11,088
Current | 400,380 | 401,970
Total Loans | 409,723 | 413,058
Loans > 90 Days and Accruing | 221 | 200
Real Estate Residential [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 2,817 | 3,676
60-89 Days Past Due | 430 | 985
Greater than 90 Days | 3,835 | 4,247
Total Past Due | 7,082 | 8,908
Current | 313,721 | 313,154
Total Loans | 320,803 | 322,062
Loans > 90 Days and Accruing | 849 | 678
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 501 | 798
60-89 Days Past Due | 82 | 313
Greater than 90 Days | 714 | 661
Total Past Due | 1,297 | 1,772
Current | 86,570 | 89,045
Total Loans | 87,867 | 90,817
Loans > 90 Days and Accruing | $ 586 | $ 571

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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. 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 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 2: 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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