Deposits (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
The components of outstanding balances and percentage change in deposits
Noninterest-bearing demand	$ 164,532,000	$ 147,031,000
Interest-bearing checking	174,200,000	179,770,000
Money market	152,646,000	145,402,000
Savings	32,797,000	32,468,000
Time, under $100,000	59,069,000	63,330,000
Time, $100,000 and over	214,105,000	213,548,000
Total Local Deposits	797,349,000	781,549,000
Percentage of Noninterest-bearing demand	14.90%	13.20%
Percentage of Interest-bearing checking	15.70%	16.20%
Percentage of Money market	13.80%	13.10%
Percentage of Savings	3.00%	2.90%
Percentage of time deposits, under $100,000	5.30%	5.70%
Percentage of time deposits, $100,000 and over	19.40%	19.20%
Percentage of total local deposits	72.10%	70.30%
Percentage of Increase or (Decrease) in Noninterest-bearing demand	11.90%
Percentage of Increase or (Decrease) of Interest-bearing checking Deposits	(3.10%)
Percentage of Increase or (Decrease) of Money market Deposits	5.00%
Percentage of Increase or (Decrease) of Savings Deposits	1.00%
Percentage of Increase or (Decrease) in Time Deposits, under $100,000	(6.70%)
Percentage of Increase or (Decrease) in Time Deposits, $100,000 and over	0.30%
Percentage of Increase or (Decrease) in Local Deposits	2.00%
Out-of-area interest-bearing checking	23,532,000	26,142,000
Out-of-area time, under $100,000	10,864,000	18,457,000
Out-of-area time, $100,000 and over	273,885,000	285,927,000
Total out-of-area deposits	308,281,000	330,526,000
Percentage of out-of-area interest- bearing checking	2.10%	2.30%
Percentage of out-of-area time, under $100,000	1.00%	1.70%
Percentage of out-of-area time, $100,000 and over	24.80%	25.70%
Aggregate percentage of out-of-area deposits	27.90%	29.70%
Percentage of Increase or (Decrease) in out-of-area interest-bearing checking	(10.00%)
Percentage of Increase or (Decrease) in out-of- area time, under $100,000	(41.10%)
Percentage Increase or (Decrease) in out-of-area time, $100,000 and over	(4.20%)
Aggregate Percentage Increase or (Decrease) in out-of-area deposits	(6.70%)
Total deposits	$ 1,105,630,000	$ 1,112,075,000
Aggregate percentage of total deposits	100.00%	100.00%
Aggregate Percentage Increase or (Decrease) in Total Deposits	(0.60%)