Fair Values of Financial Instruments (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Financial assets:
Available for sale securities	$ 135,660,000	$ 172,992,000
Carrying Values [Member] | Interest rate swap agreement [Member]
Financial liabilities:
Interest rate swap	1,106,000	0
Fair Value [Member] | Interest rate swap agreement [Member]
Financial liabilities:
Interest rate swap	1,106,000	0
Level 1 [Member] | Carrying Values [Member]
Financial assets:
Cash	1,427,000	1,311,000
Level 1 [Member] | Fair Value [Member]
Financial assets:
Cash	1,427,000	1,311,000
Level 2 [Member] | Carrying Values [Member]
Financial assets:
Cash equivalents	102,568,000	75,061,000
Available for sale securities	135,660,000	172,992,000
Federal Home Loan Bank stock	11,961,000	11,961,000
Bank owned life insurance	49,690,000	48,520,000
Accrued interest receivable	3,939,000	4,403,000
Financial liabilities:
Deposits	1,107,566,000	1,112,075,000
Securities sold under agreements to repurchase	60,031,000	72,569,000
Federal Home Loan Bank advances	35,000,000	45,000,000
Subordinated debentures	32,990,000	32,990,000
Accrued interest payable	1,970,000	2,839,000
Level 2 [Member] | Carrying Values [Member] | Interest rate cap contracts [Member]
Financial assets:
Purchased interest rate cap	17,000	312,000
Financial liabilities:
Sold interest rate cap	1,000	55,000
Level 2 [Member] | Fair Value [Member]
Financial assets:
Cash equivalents	102,568,000	75,061,000
Available for sale securities	135,660,000	172,992,000
Federal Home Loan Bank stock	11,961,000	11,961,000
Bank owned life insurance	49,690,000	48,520,000
Accrued interest receivable	3,939,000	4,403,000
Financial liabilities:
Deposits	1,109,599,000	1,117,803,000
Securities sold under agreements to repurchase	60,031,000	72,569,000
Federal Home Loan Bank advances	35,153,000	46,019,000
Subordinated debentures	32,912,000	33,096,000
Accrued interest payable	1,970,000	2,839,000
Level 2 [Member] | Fair Value [Member] | Interest rate cap contracts [Member]
Financial assets:
Purchased interest rate cap	17,000	312,000
Financial liabilities:
Sold interest rate cap	1,000	55,000
Level 3 [Member] | Carrying Values [Member]
Financial assets:
Loans, net	1,007,526,000	1,035,890,000
Level 3 [Member] | Fair Value [Member]
Financial assets:
Loans, net	$ 998,664,000	$ 1,035,164,000