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Securities - Trading Securities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | $ 4,358 | $ 4,459
Corporate Equity Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 2,998 | 3,117
Certificates of Deposit [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 253 | 408
International Mutual Funds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 257 | 287
Large Cap Growth Mutual Funds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 182 | 157
Large Cap Value Mutual Funds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 121 | 104
Real Estate Investment Trust Mutual Funds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 40 | 65
Corporate Notes and Bonds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 152 | 101
Mid Cap Mutual Funds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 81 | 26
Small Cap Mutual Funds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 81 | 26
U.S. Government Sponsored Entities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 53 | 58
Commodities Mutual Funds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 54 | 0
Money Market Mutual Funds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | $ 86 | $ 110

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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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