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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