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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 225,524 | $ 34,286
Fair value more than 12 months | 42,380 | 90,657
Total fair value | 267,904 | 124,943
Unrealized losses less than 12 months | (2,632) | (225)
Unrealized losses more than 12 months | (980) | (1,560)
Total unrealized losses | (3,613) | (1,785)
U.S. Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 5,468 | 2,993
Fair value more than 12 months |  | 20,762
Total fair value | 5,468 | 23,755
Unrealized losses less than 12 months | (17) | (7)
Unrealized losses more than 12 months |  | (222)
Total unrealized losses | (17) | (229)
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 17,353 | 10,287
Fair value more than 12 months | 446 | 2,050
Total fair value | 17,799 | 12,337
Unrealized losses less than 12 months | (280) | (121)
Unrealized losses more than 12 months | (6) | (30)
Total unrealized losses | (286) | (151)
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 89,459 | 15,013
Fair value more than 12 months | 25,428 | 39,801
Total fair value | 114,887 | 54,814
Unrealized losses less than 12 months | (1,123) | (88)
Unrealized losses more than 12 months | (655) | (957)
Total unrealized losses | (1,779) | (1,045)
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 113,244 | 5,993
Fair value more than 12 months | 16,506 | 28,044
Total fair value | 129,750 | 34,037
Unrealized losses less than 12 months | (1,212) | (9)
Unrealized losses more than 12 months | (319) | (351)
Total unrealized losses | $ (1,531) | $ (360)

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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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