Securities (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Amortized cost and fair value of available for sale securities and related pre-tax gross unrealized gains and losses
Amortized Cost	$ 130,743,000	$ 167,158,000
Gross Unrealized Gains	4,996,000	5,893,000
Gross Unrealized Losses	(79,000)	(59,000)
Fair Value	135,660,000	172,992,000
U.S. Government agency debt obligations [Member]
Amortized cost and fair value of available for sale securities and related pre-tax gross unrealized gains and losses
Amortized Cost	69,413,000	86,783,000
Gross Unrealized Gains	1,395,000	1,872,000
Gross Unrealized Losses	(79,000)	(59,000)
Fair Value	70,729,000	88,596,000
Mortgage-backed securities [Member]
Amortized cost and fair value of available for sale securities and related pre-tax gross unrealized gains and losses
Amortized Cost	23,004,000	31,851,000
Gross Unrealized Gains	2,280,000	2,759,000
Gross Unrealized Losses	0	0
Fair Value	25,284,000	34,610,000
Michigan Strategic Fund bonds [Member]
Amortized cost and fair value of available for sale securities and related pre-tax gross unrealized gains and losses
Amortized Cost	11,255,000	16,700,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	11,255,000	16,700,000
Municipal general obligation bonds [Member]
Amortized cost and fair value of available for sale securities and related pre-tax gross unrealized gains and losses
Amortized Cost	22,985,000	26,212,000
Gross Unrealized Gains	1,131,000	1,097,000
Gross Unrealized Losses	0	0
Fair Value	24,116,000	27,309,000
Municipal revenue bonds [Member]
Amortized cost and fair value of available for sale securities and related pre-tax gross unrealized gains and losses
Amortized Cost	2,748,000	4,300,000
Gross Unrealized Gains	122,000	123,000
Gross Unrealized Losses	0	0
Fair Value	2,870,000	4,423,000
Mutual funds [Member]
Amortized cost and fair value of available for sale securities and related pre-tax gross unrealized gains and losses
Amortized Cost	1,338,000	1,312,000
Gross Unrealized Gains	68,000	42,000
Gross Unrealized Losses	0	0
Fair Value	$ 1,406,000	$ 1,354,000

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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