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Other Real Estate Owned - Summary of Foreclosed Property Activity (Detail) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Real Estate Acquired Through Foreclosure [Line Items] |  |
Beginning Balance | $ 7,735 | $ 9,310
Transfers from loans | 1,702 | 4,513
Sales proceeds | (2,369) | (3,327)
Gross gains | 4 | 235
Gross losses | (283) | (227)
Net gains (losses) | (279) | 8
Impairment | (133) | (193)
Ending Balance | 6,656 | 10,311
FUSB [Member] |  |
Real Estate Acquired Through Foreclosure [Line Items] |  |
Beginning Balance | 6,997 | 8,463
Transfers from loans | 1,439 | 4,152
Sales proceeds | (2,225) | (3,113)
Gross gains | 4 | 231
Gross losses | (210) | (128)
Net gains (losses) | (206) | 103
Impairment | (44) | (146)
Ending Balance | 5,961 | 9,459
ALC [Member] |  |
Real Estate Acquired Through Foreclosure [Line Items] |  |
Beginning Balance | 738 | 847
Transfers from loans | 263 | 361
Sales proceeds | (144) | (214)
Gross gains |  | 4
Gross losses | (73) | (99)
Net gains (losses) | (73) | (95)
Impairment | (89) | (47)
Ending Balance | $ 695 | $ 852

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- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5162-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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