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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value $ 131,178,000 $ 138,314,000
U.S. Government agency debt obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 98,477,000 79,098,000
Mortgage-backed securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 13,558,000 21,996,000
Michigan Strategic Fund bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 0 11,255,000
Municipal general obligation bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 16,872,000 22,743,000
Mutual funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 1,355,000 1,405,000
Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets and liabilities measured at fair value on recurring basis 130,914,000 137,201,000
Fair Value, Measurements, Recurring [Member] | U.S. Government agency debt obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 98,477,000 79,098,000
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 13,558,000 21,996,000
Fair Value, Measurements, Recurring [Member] | Michigan Strategic Fund bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value   11,255,000
Fair Value, Measurements, Recurring [Member] | Municipal general obligation bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 16,872,000 22,743,000
Fair Value, Measurements, Recurring [Member] | Municipal revenue bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 916,000 1,817,000
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 1,355,000 1,405,000
Fair Value, Measurements, Recurring [Member] | Interest rate swap agreement [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives (264,000) (1,113,000)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets and liabilities measured at fair value on recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Government agency debt obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Mortgage-backed securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Michigan Strategic Fund bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value   0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal general obligation bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal revenue bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Mutual funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest rate swap agreement [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets and liabilities measured at fair value on recurring basis 130,914,000 137,201,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government agency debt obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 98,477,000 79,098,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mortgage-backed securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 13,558,000 21,996,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Michigan Strategic Fund bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value   11,255,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal general obligation bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 16,872,000 22,743,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal revenue bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 916,000 1,817,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mutual funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 1,355,000 1,405,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest rate swap agreement [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives (264,000) (1,113,000)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets and liabilities measured at fair value on recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Government agency debt obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage-backed securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Michigan Strategic Fund bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value   0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Municipal general obligation bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Municipal revenue bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mutual funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities/Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest rate swap agreement [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives $ 0 $ 0