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Parent Company Only Financial Statements - Statements of Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Expense    
Interest expense $ 1,982 $ 1,441
Supplies 450 783
Legal and professional fees 884 1,336
Allocated income tax benefit (2,353) (956)
Net income 5,907 2,655
Effective dividend on preferred stock   1,113
Net income available to common shareholders 5,907 1,542
Parent Company [Member]    
Income    
Dividends from subsidiary 2,325 13,500
Total income 2,325 13,500
Expense    
Interest expense 620 286
Supplies 2 17
Legal and professional fees 104 78
Data processing 61 60
Management fee-subsidiary 258 250
Other expense 17 21
Total expense 1,062 712
Income before allocated tax benefits and undistributed income of subsidiary 1,263 12,788
Allocated income tax benefit 361 242
Income before equity in undistributed income of subsidiary 1,624 13,030
Equity in undistributed (distributed) income of subsidiary 4,283 (10,375)
Net income 5,907 2,655
Effective dividend on preferred stock   1,113
Net income available to common shareholders $ 5,907 $ 1,542