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Other Real Estate Owned - Summary of Foreclosed Property Activity (Detail) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | $ 7,735 | $ 9,310
Transfers from loans | 1,114 | 4,252
Sales proceeds | (1,370) | (3,107)
Gross gains | 4 | 230
Gross losses | (250) | (185)
Net gains (losses) | (246) | 45
Impairment | (65) | (193)
Ending Balance | 7,168 | 10,307
FUSB [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | 6,997 | 8,463
Transfers from loans | 996 | 4,020
Sales proceeds | (1,274) | (2,956)
Gross gains | 4 | 230
Gross losses | (190) | (127)
Net gains (losses) | (186) | 103
Impairment | (24) | (146)
Ending Balance | 6,509 | 9,484
ALC [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | 738 | 847
Transfers from loans | 118 | 232
Sales proceeds | (96) | (151)
Gross losses | (60) | (58)
Net gains (losses) | (60) | (58)
Impairment | (41) | (47)
Ending Balance | $ 659 | $ 823

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