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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 191,633 | $ 241,541
Fair value more than 12 months | 31,422 | 11,807
Total fair value | 223,055 | 253,348
Unrealized losses less than 12 months | (4,436) | (8,205)
Unrealized losses more than 12 months | (1,449) | (646)
Total unrealized losses | (5,885) | (8,851)
U.S. Treasury and federal agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 31,303 | 32,099
Fair value more than 12 months |  |
Total fair value | 31,303 | 32,099
Unrealized losses less than 12 months | (578) | (807)
Unrealized losses more than 12 months |  |
Total unrealized losses | (578) | (807)
State and municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 47,875 | 57,078
Fair value more than 12 months | 5,040 | 3,206
Total fair value | 52,915 | 60,284
Unrealized losses less than 12 months | (1,578) | (2,993)
Unrealized losses more than 12 months | (250) | (184)
Total unrealized losses | (1,828) | (3,177)
Federal agency collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 42,858 | 64,445
Fair value more than 12 months | 26,382 | 8,601
Total fair value | 69,240 | 73,046
Unrealized losses less than 12 months | (675) | (2,121)
Unrealized losses more than 12 months | (1,199) | (462)
Total unrealized losses | (1,874) | (2,583)
Federal agency mortgage-backed pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 69,597 | 87,919
Fair value more than 12 months |  |
Total fair value | 69,597 | 87,919
Unrealized losses less than 12 months | (1,605) | (2,284)
Unrealized losses more than 12 months |  |
Total unrealized losses | $ (1,605) | $ (2,284)

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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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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: 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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