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Securities - Amortized Cost and Fair Value of Available for Sale Securities and Related Pre-tax Gross Unrealized Gains and Losses (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 139,487,000 $ 134,664,000
Gross Unrealized Gains 1,791,000 4,038,000
Gross Unrealized Losses (10,100,000) (388,000)
Fair Value 131,178,000 138,314,000
U.S. Government agency debt obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 108,279,000 78,447,000
Gross Unrealized Gains 263,000 1,039,000
Gross Unrealized Losses (10,065,000) (388,000)
Fair Value 98,477,000 79,098,000
Mortgage-backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 12,456,000 20,182,000
Gross Unrealized Gains 1,102,000 1,814,000
Gross Unrealized Losses 0 0
Fair Value 13,558,000 21,996,000
Michigan Strategic Fund bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 0 11,255,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 11,255,000
Municipal general obligation bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 16,488,000 21,700,000
Gross Unrealized Gains 388,000 1,043,000
Gross Unrealized Losses (4,000) 0
Fair Value 16,872,000 22,743,000
Municipal revenue bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 878,000 1,726,000
Gross Unrealized Gains 38,000 91,000
Gross Unrealized Losses 0 0
Fair Value 916,000 1,817,000
Mutual funds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,386,000 1,354,000
Gross Unrealized Gains 0 51,000
Gross Unrealized Losses (31,000) 0
Fair Value $ 1,355,000 $ 1,405,000