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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 241,541 | $ 41,837
Fair value more than 12 months | 11,807 |
Total fair value | 253,348 | 41,837
Unrealized losses less than 12 months | (8,205) | (168)
Unrealized losses more than 12 months | (646) |
Total unrealized losses | (8,851) | (168)
U.S. Treasury and federal agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 32,099 | 13,064
Fair value more than 12 months |  |
Total fair value | 32,099 | 13,064
Unrealized losses less than 12 months | (807) | (30)
Unrealized losses more than 12 months |  |
Total unrealized losses | (807) | (30)
State and municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 57,078 | 11,928
Fair value more than 12 months | 3,206 |
Total fair value | 60,284 | 11,928
Unrealized losses less than 12 months | (2,993) | (84)
Unrealized losses more than 12 months | (184) |
Total unrealized losses | (3,177) | (84)
Federal agency collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 64,445 | 12,719
Fair value more than 12 months | 8,601 |
Total fair value | 73,046 | 12,719
Unrealized losses less than 12 months | (2,121) | (39)
Unrealized losses more than 12 months | (462) |
Total unrealized losses | (2,583) | (39)
Federal agency mortgage-backed pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 87,919 | 4,126
Fair value more than 12 months |  |
Total fair value | 87,919 | 4,126
Unrealized losses less than 12 months | (2,284) | (15)
Unrealized losses more than 12 months |  |
Total unrealized losses | $ (2,284) | $ (15)

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- Definition Loss position aggregate losses accumulated in investments. + References No definition available. + Details
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- Definition Available for sale securities continuous unrealized loss position less than twelve months aggregate losses accumulated in investments. + References No definition available. + Details
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- Definition Loss position twelve months or longer aggregate losses accumulated in investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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