Deposits (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
The components of outstanding balances and percentage change in deposits
Noninterest-bearing demand	$ 190,241,000	$ 147,031,000
Interest-bearing checking	188,057,000	179,770,000
Money market	144,479,000	145,402,000
Savings	56,454,000	32,468,000
Time, under $100,000	51,730,000	63,330,000
Time, $100,000 and over	234,430,000	213,548,000
Total Local Deposits	865,391,000	781,549,000
Percentage of Noninterest-bearing demand	16.80%	13.20%
Percentage of Interest-bearing checking	16.50%	16.20%
Percentage of Money market	12.70%	13.10%
Percentage of Savings	5.00%	2.90%
Percentage of time deposits under $100,000	4.60%	5.70%
Percentage of time deposits $100,000 and over	20.60%	19.20%
Percentage of total local deposits	76.20%	70.30%
Percentage of Increase or (Decrease) in Noninterest-bearing demand	29.40%
Percentage of Increase or (Decrease) of Interest-bearing checking Deposits	4.60%
Percentage of Increase or (Decrease) of Money market Deposits	(0.60%)
Percentage of Increase or (Decrease) of Savings Deposits	73.90%
Percentage of Increase or (Decrease) in Time Deposits, under $100,000	(18.30%)
Percentage of Increase or (Decrease) in Time Deposits, $100,000 and over	9.80%
Percentage of Increase or (Decrease) in Total Local Deposits	10.70%
Out-of-area interest-bearing checking	21,967,000	26,142,000
Out-of-area time, under $100,000	7,706,000	18,457,000
Out-of-area time, $100,000 and over	240,140,000	285,927,000
Total out-of-area deposits	269,813,000	330,526,000
Percentage of out-of-area interest- bearing checking	1.90%	2.30%
Percentage of out-of-area time, under $100,000	0.70%	1.70%
Percentage of out-of-area time, $100,000 and over	21.20%	25.70%
Aggregate percentage of out-of-area deposits	23.80%	29.70%
Percentage of Increase or (Decrease) in out-of-area interest-bearing checking	(16.00%)
Percentage of Increase or (Decrease) in out-of- area time, under $100,000	(58.20%)
Percentage Increase or (Decrease) in out-of-area time, $100,000 and over	(16.00%)
Aggregate Percentage Increase or (Decrease) in out-of-area deposits	(18.40%)
Total deposits	$ 1,135,204,000	$ 1,112,075,000
Aggregate percentage of total deposits	100.00%	100.00%
Aggregate Percentage Increase or (Decrease) in Total Deposits	2.10%