Segment Reporting - Summary of Results for Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Total interest income $ 8,340 $ 8,270 $ 8,432 $ 8,594 $ 9,667 $ 9,328 $ 9,748 $ 10,010 $ 33,636 $ 38,753  
Total interest expense 677 702 737 789 888 1,031 1,177 1,460 2,905 4,556  
Net interest income 7,663 7,568 7,695 7,805 8,779 8,297 8,571 8,550 30,731 34,197  
PROVISION (REDUCTION IN RESERVE) FOR LOAN LOSSES (1,441) 240 53 506 1,163 492 468 2,215 (642) 4,338 18,800
Net interest income after provision (reduction in reserve) 9,104 7,328 7,642 7,299 7,616 7,805 8,103 6,335 31,373 29,859  
Total non-interest income 723 1,291 1,228 1,623 1,507 1,453 1,331 1,274 4,865 5,565  
Total non-interest expense 8,569 7,365 7,176 7,692 7,652 7,562 7,442 9,828 30,802 32,484  
Income (loss) before income taxes 1,258 1,254 1,694 1,230 1,471 1,696 1,992 (2,219) 5,436 2,940  
PROVISION FOR INCOME TAXES 303 350 512 344 588 517 622 (982) 1,509 745  
Net income (loss) 955 904 1,182 886 883 1,179 1,370 (1,237) 3,927 2,195  
Other significant items:                      
Total interest income 8,340 8,270 8,432 8,594 9,667 9,328 9,748 10,010 33,636 38,753  
Total interest expense 677 702 737 789 888 1,031 1,177 1,460 2,905 4,556  
Net interest income 7,663 7,568 7,695 7,805 8,779 8,297 8,571 8,550 30,731 34,197  
PROVISION (REDUCTION IN RESERVE) FOR LOAN LOSSES (1,441) 240 53 506 1,163 492 468 2,215 (642) 4,338 18,800
Net interest income after provision 9,104 7,328 7,642 7,299 7,616 7,805 8,103 6,335 31,373 29,859  
Total non-interest income 723 1,291 1,228 1,623 1,507 1,453 1,331 1,274 4,865 5,565  
Total non-interest expense 8,569 7,365 7,176 7,692 7,652 7,562 7,442 9,828 30,802 32,484  
Income (loss) before income taxes 1,258 1,254 1,694 1,230 1,471 1,696 1,992 (2,219) 5,436 2,940  
PROVISION FOR INCOME TAXES 303 350 512 344 588 517 622 (982) 1,509 745  
Net income (loss) 955 904 1,182 886 883 1,179 1,370 (1,237) 3,927 2,195  
Total assets 569,801       567,133       569,801 567,133  
Total investment securities 170,804       113,750       170,804 113,750  
Total loans, net 300,927       337,400       300,927 337,400  
Investment in subsidiaries 5       5       5 5  
Fixed asset additions                 381 572  
Depreciation and amortization expense                 717 715  
Total interest income from external customers                 33,636 38,753  
Eliminations [Member]
                      
Segment Reporting Information [Line Items]                      
Total interest income                 (3,233) (3,878)  
Total interest expense                 (3,233) (3,878)  
Total non-interest income                 (887) (772)  
Total non-interest expense                 (887) (772)  
Other significant items:                      
Total interest income                 (3,233) (3,878)  
Total interest expense                 (3,233) (3,878)  
Total non-interest income                 (887) (772)  
Total non-interest expense                 (887) (772)  
Total assets (137,166)       (144,289)       (137,166) (144,289)  
Total loans, net (59,616)       (63,634)       (59,616) (63,634)  
Investment in subsidiaries (71,875)       (70,536)       (71,875) (70,536)  
Total interest income from affiliates                 (3,233) (3,877)  
FUSB [Member]
                      
Segment Reporting Information [Line Items]                      
PROVISION (REDUCTION IN RESERVE) FOR LOAN LOSSES                 (2,862) 1,294  
Other significant items:                      
PROVISION (REDUCTION IN RESERVE) FOR LOAN LOSSES                 (2,862) 1,294  
FUSB [Member] | Operating Segments [Member]
                      
Segment Reporting Information [Line Items]                      
Total interest income                 19,833 24,109  
Total interest expense                 2,915 4,575  
Net interest income                 16,918 19,534  
PROVISION (REDUCTION IN RESERVE) FOR LOAN LOSSES                 (2,862) 1,294  
Net interest income after provision (reduction in reserve)                 19,780 18,240  
Total non-interest income                 3,553 3,967  
Total non-interest expense                 20,464 21,368  
Income (loss) before income taxes                 2,869 839  
PROVISION FOR INCOME TAXES                 493 (145)  
Net income (loss)                 2,376 984  
Other significant items:                      
Total interest income                 19,833 24,109  
Total interest expense                 2,915 4,575  
Net interest income                 16,918 19,534  
PROVISION (REDUCTION IN RESERVE) FOR LOAN LOSSES                 (2,862) 1,294  
Net interest income after provision                 19,780 18,240  
Total non-interest income                 3,553 3,967  
Total non-interest expense                 20,464 21,368  
Income (loss) before income taxes                 2,869 839  
PROVISION FOR INCOME TAXES                 493 (145)  
Net income (loss)                 2,376 984  
Total assets 559,159       557,374       559,159 557,374  
Total investment securities 170,724       113,670       170,724 113,670  
Total loans, net 293,069       329,425       293,069 329,425  
Investment in subsidiaries 784       784       784 784  
Fixed asset additions                 323 314  
Depreciation and amortization expense                 539 562  
Total interest income from external customers                 16,610 20,250  
Total interest income from affiliates                 3,223 3,858  
ALC [Member]
                      
Segment Reporting Information [Line Items]                      
PROVISION (REDUCTION IN RESERVE) FOR LOAN LOSSES                 2,220 3,044  
Other significant items:                      
PROVISION (REDUCTION IN RESERVE) FOR LOAN LOSSES                 2,220 3,044  
ALC [Member] | Operating Segments [Member]
                      
Segment Reporting Information [Line Items]                      
Total interest income                 17,026 18,503  
Total interest expense                 3,223 3,859  
Net interest income                 13,803 14,644  
PROVISION (REDUCTION IN RESERVE) FOR LOAN LOSSES                 2,220 3,044  
Net interest income after provision (reduction in reserve)                 11,583 11,600  
Total non-interest income                 1,387 1,414  
Total non-interest expense                 10,303 10,734  
Income (loss) before income taxes                 2,667 2,280  
PROVISION FOR INCOME TAXES                 1,012 884  
Net income (loss)                 1,655 1,396  
Other significant items:                      
Total interest income                 17,026 18,503  
Total interest expense                 3,223 3,859  
Net interest income                 13,803 14,644  
PROVISION (REDUCTION IN RESERVE) FOR LOAN LOSSES                 2,220 3,044  
Net interest income after provision                 11,583 11,600  
Total non-interest income                 1,387 1,414  
Total non-interest expense                 10,303 10,734  
Income (loss) before income taxes                 2,667 2,280  
PROVISION FOR INCOME TAXES                 1,012 884  
Net income (loss)                 1,655 1,396  
Total assets 71,572       79,090       71,572 79,090  
Total loans, net 67,474       71,609       67,474 71,609  
Fixed asset additions                 58 258  
Depreciation and amortization expense                 178 153  
Total interest income from external customers                 17,026 18,503  
All Other [Member] | Operating Segments [Member]
                      
Segment Reporting Information [Line Items]                      
Total interest income                 10 19  
Net interest income                 10 19  
Net interest income after provision (reduction in reserve)                 10 19  
Total non-interest income                 812 956  
Total non-interest expense                 922 1,154  
Income (loss) before income taxes                 (100) (179)  
PROVISION FOR INCOME TAXES                 4 6  
Net income (loss)                 (104) (185)  
Other significant items:                      
Total interest income                 10 19  
Net interest income                 10 19  
Net interest income after provision                 10 19  
Total non-interest income                 812 956  
Total non-interest expense                 922 1,154  
Income (loss) before income taxes                 (100) (179)  
PROVISION FOR INCOME TAXES                 4 6  
Net income (loss)                 (104) (185)  
Total assets 76,236       74,958       76,236 74,958  
Total investment securities 80       80       80 80  
Investment in subsidiaries 71,096       69,757       71,096 69,757  
Total interest income from affiliates                 $ 10 $ 19