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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 192,915 | $ 192,252
Gross Unrealized Gains | 5,970 | 6,262
Gross Unrealized Losses | (230) | (609)
Total securities available for sale, Fair Value | 198,655 | 197,905
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 39,271 | 42,910
Gross Unrealized Gains | 234 | 115
Gross Unrealized Losses | (13) | (123)
Total securities available for sale, Fair Value | 39,492 | 42,902
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 87,971 | 83,215
Gross Unrealized Gains | 4,551 | 5,112
Gross Unrealized Losses | (143) | (306)
Total securities available for sale, Fair Value | 92,379 | 88,021
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 65,192 | 65,646
Gross Unrealized Gains | 1,079 | 976
Gross Unrealized Losses | (74) | (180)
Total securities available for sale, Fair Value | 66,197 | 66,442
Total Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 192,434 | 191,771
Gross Unrealized Gains | 5,864 | 6,203
Gross Unrealized Losses | (230) | (609)
Total securities available for sale, Fair Value | 198,068 | 197,365
Equity Securities in Financial Institutions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 481 | 481
Gross Unrealized Gains | 106 | 59
Total securities available for sale, Fair Value | $ 587 | $ 540

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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=51813488&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=49167202&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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