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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 40,304 | $ 225,524
Fair value more than 12 months | 30,384 | 42,380
Total fair value | 70,688 | 267,904
Unrealized losses less than 12 months | (481) | (2,632)
Unrealized losses more than 12 months | (208) | (980)
Total unrealized losses | (689) | (3,613)
U.S. Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 1,998 | 5,468
Total fair value | 1,998 | 5,468
Unrealized losses less than 12 months | (2) | (17)
Total unrealized losses | (2) | (17)
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 1,931 | 17,353
Fair value more than 12 months | 1,812 | 446
Total fair value | 3,743 | 17,799
Unrealized losses less than 12 months | (186) | (280)
Unrealized losses more than 12 months | (4) | (6)
Total unrealized losses | (190) | (286)
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 6,684 | 89,459
Fair value more than 12 months | 24,739 | 25,428
Total fair value | 31,423 | 114,887
Unrealized losses less than 12 months | (54) | (1,123)
Unrealized losses more than 12 months | (156) | (655)
Total unrealized losses | (210) | (1,779)
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 29,691 | 113,244
Fair value more than 12 months | 3,833 | 16,506
Total fair value | 33,524 | 129,750
Unrealized losses less than 12 months | (239) | (1,212)
Unrealized losses more than 12 months | (48) | (319)
Total unrealized losses | $ (287) | $ (1,531)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + 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)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + 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)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous 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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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 + Details
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