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Securities - Securities with unrealized losses aggregated by investment category and length of time (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months $ 71,901,000 $ 33,555,000
Unrealized Loss, Less than 12 Months (7,703,000) (388,000)
Fair Value, 12 Months or More 6,134,000 0
Unrealized Loss, 12 Months or More (851,000) 0
Fair Value 78,035,000 33,555,000
Unrealized Loss (8,554,000) (388,000)
U.S. Government agency debt obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 70,142,000 33,555,000
Unrealized Loss, Less than 12 Months (7,691,000) (388,000)
Fair Value, 12 Months or More 6,134,000 0
Unrealized Loss, 12 Months or More (851,000) 0
Fair Value 76,276,000 33,555,000
Unrealized Loss (8,542,000) (388,000)
Mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 0 0
Unrealized Loss, Less than 12 Months 0 0
Fair Value, 12 Months or More 0 0
Unrealized Loss, 12 Months or More 0 0
Fair Value 0 0
Unrealized Loss 0 0
Michigan Strategic Fund bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 0 0
Unrealized Loss, Less than 12 Months 0 0
Fair Value, 12 Months or More 0 0
Unrealized Loss, 12 Months or More 0 0
Fair Value 0 0
Unrealized Loss 0 0
Municipal general obligation bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 394,000 0
Unrealized Loss, Less than 12 Months (1,000) 0
Fair Value, 12 Months or More 0 0
Unrealized Loss, 12 Months or More 0 0
Fair Value 394,000 0
Unrealized Loss (1,000) 0
Municipal revenue bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 0 0
Unrealized Loss, Less than 12 Months 0 0
Fair Value, 12 Months or More 0 0
Unrealized Loss, 12 Months or More 0 0
Fair Value 0 0
Unrealized Loss 0 0
Mutual funds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 1,365,000 0
Unrealized Loss, Less than 12 Months (11,000) 0
Fair Value, 12 Months or More 0 0
Unrealized Loss, 12 Months or More 0 0
Fair Value 1,365,000 0
Unrealized Loss $ (11,000) $ 0