Fair Values of Financial Instruments (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Financial assets:
Fair Value of Available for sale securities	$ 127,591,000	$ 172,992,000
Carrying Values [Member] | Interest rate swap agreement [Member]
Financial liabilities:
Interest rate swap	647,000	0
Estimated Fair Value [Member] | Interest rate swap agreement [Member]
Financial liabilities:
Interest rate swap	647,000	0
Level 1 [Member] | Carrying Values [Member]
Financial assets:
Cash	1,546,000	1,311,000
Level 1 [Member] | Estimated Fair Value [Member]
Financial assets:
Cash	1,546,000	1,311,000
Level 2 [Member] | Carrying Values [Member]
Financial assets:
Cash equivalents	80,920,000	75,061,000
Fair Value of Available for sale securities	127,591,000	172,992,000
Federal Home Loan Bank stock	11,961,000	11,961,000
Bank owned life insurance	49,312,000	48,520,000
Accrued interest receivable	3,895,000	4,403,000
Financial liabilities:
Deposits	1,105,630,000	1,112,075,000
Securities sold under agreements to repurchase	52,831,000	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	2,237,000	2,839,000
Level 2 [Member] | Carrying Values [Member] | Interest rate cap contracts [Member]
Financial assets:
Purchased interest rate cap	71,000	312,000
Financial liabilities:
Sold interest rate cap	4,000	55,000
Level 2 [Member] | Estimated Fair Value [Member]
Financial assets:
Cash equivalents	80,920,000	75,061,000
Fair Value of Available for sale securities	127,591,000	172,992,000
Federal Home Loan Bank stock	11,961,000	11,961,000
Bank owned life insurance	49,312,000	48,520,000
Accrued interest receivable	3,895,000	4,403,000
Financial liabilities:
Deposits	1,107,399,000	1,117,803,000
Securities sold under agreements to repurchase	52,831,000	72,569,000
Federal Home Loan Bank advances	35,395,000	46,019,000
Subordinated debentures	32,984,000	33,096,000
Accrued interest payable	2,237,000	2,839,000
Level 2 [Member] | Estimated Fair Value [Member] | Interest rate cap contracts [Member]
Financial assets:
Purchased interest rate cap	71,000	312,000
Financial liabilities:
Sold interest rate cap	4,000	55,000
Level 3 [Member] | Carrying Values [Member]
Financial assets:
Loans, net	1,031,307,000	1,035,890,000
Level 3 [Member] | Estimated Fair Value [Member]
Financial assets:
Loans, net	$ 1,024,995,000	$ 1,035,164,000