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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost | $ 296,905 | $ 154,536
Available for Sale, Gross Unrealized Gains | 3,982 | 6,868
Available for Sale, Gross Unrealized Losses | 1,172 | 13
Available for Sale, Fair Value | 299,715 | 161,391
Held to Maturity, Amortized Cost | 17,295 | 15,902
Held to Maturity, Gross Unrealized Gains | 657 | 872
Held to Maturity, Gross Unrealized Losses | 777 |
Held to Maturity, Fair Value | 17,175 | 16,774
State and Municipals, Tax-exempt [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost | 96,194 | 53,846
Available for Sale, Gross Unrealized Gains | 2,267 | 4,991
Available for Sale, Gross Unrealized Losses | 380 |
Available for Sale, Fair Value | 98,081 | 58,837
Held to Maturity, Amortized Cost | 7,372 | 1,083
Held to Maturity, Gross Unrealized Gains | 11 | 16
Held to Maturity, Gross Unrealized Losses | 777 |
Held to Maturity, Fair Value | 6,606 | 1,099
Corporate Debt Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost | 4,433 |
Available for Sale, Gross Unrealized Gains | 32 |
Available for Sale, Gross Unrealized Losses | 78 |
Available for Sale, Fair Value | 4,387 |
Held to Maturity, Fair Value |  |
U.S. Government Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost | 207 |
Available for Sale, Gross Unrealized Gains |  |
Available for Sale, Gross Unrealized Losses | 3 |
Available for Sale, Fair Value | 204 |
Held to Maturity, Amortized Cost | 117 | 136
Held to Maturity, Gross Unrealized Gains | 2 | 4
Held to Maturity, Fair Value | 119 | 140
Mortgage-backed Securities, U.S. Government-Sponsored Enterprises [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost | 45,251 | 15,962
Available for Sale, Gross Unrealized Gains | 763 | 839
Available for Sale, Gross Unrealized Losses | 40 |
Available for Sale, Fair Value | 45,974 | 16,801
Held to Maturity, Amortized Cost | 9,806 | 14,683
Held to Maturity, Gross Unrealized Gains | 644 | 852
Held to Maturity, Fair Value | 10,450 | 15,535
Common Stock [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost | 756 | 801
Available for Sale, Gross Unrealized Gains | 351 | 281
Available for Sale, Gross Unrealized Losses | 10 | 11
Available for Sale, Fair Value | 1,097 | 1,071
Held to Maturity, Fair Value |  |
U.S. Government-Sponsored Enterprises [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost | 113,221 | 83,927
Available for Sale, Gross Unrealized Gains | 296 | 757
Available for Sale, Gross Unrealized Losses | 472 | 2
Available for Sale, Fair Value | 113,045 | 84,682
State and Municipals, Taxable [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost | 16,664 |
Available for Sale, Gross Unrealized Gains | 160 |
Available for Sale, Gross Unrealized Losses | 126 |
Available for Sale, Fair Value | 16,698 |
Mortgage-backed Securities, U.S. Government Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost | 20,179 |
Available for Sale, Gross Unrealized Gains | 113 |
Available for Sale, Gross Unrealized Losses | 63 |
Available for Sale, Fair Value | $ 20,229 |

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- Definition This item represents the excess of amortized cost basis over fair value of securities in a gain position and which are categorized as held-to-maturity. + References No definition available. + Details
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- Definition This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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