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Securities - Securities with Unrealized Losses Aggregated by Investment Category and Length of Time (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months $ 58,767,000 $ 33,555,000
Unrealized Loss, Less than 12 Months 5,833,000 388,000
Fair Value, 12 Months or More 29,679,000 0
Unrealized Loss, 12 Months or More 4,267,000 0
Fair Value 88,446,000 33,555,000
Unrealized Loss 10,100,000 388,000
U.S. Government agency debt obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 57,117,000 33,555,000
Unrealized Loss, Less than 12 Months 5,798,000 388,000
Fair Value, 12 Months or More 29,679,000 0
Unrealized Loss, 12 Months or More 4,267,000 0
Fair Value 86,796,000 33,555,000
Unrealized Loss 10,065,000 388,000
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 295,000 0
Unrealized Loss, Less than 12 Months 4,000 0
Fair Value, 12 Months or More 0 0
Unrealized Loss, 12 Months or More 0 0
Fair Value 295,000 0
Unrealized Loss 4,000 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 1,355,000 0
Unrealized Loss, Less than 12 Months 31,000 0
Fair Value, 12 Months or More 0 0
Unrealized Loss, 12 Months or More 0 0
Fair Value 1,355,000 0
Unrealized Loss $ 31,000 $ 0