Parent Company Financial Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Parent Company Financial Information
Percentage of capital stock of the Bank held	100.00%
Assets:
Cash and cash equivalents	$ 59,352	$ 60,235
Deferred income taxes	6,887	8,998
Other assets	3,276	3,727
TOTAL ASSETS	1,173,792	961,128
Liabilities:
Subordinated debentures	10,310	10,310
Accrued expenses and other liabilities	8,697	6,664
TOTAL LIABILITIES	1,039,275	874,351
Total Stockholders' Equity	134,517	86,777	78,602	73,502
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,173,792	961,128
Corporation
Assets:
Cash and cash equivalents	7,027	604
Investment in subsidiaries	133,560	91,952
Deferred income taxes	4,129	4,222
Other assets	411	456
TOTAL ASSETS	145,127	97,234
Liabilities:
Subordinated debentures	10,310	10,310
Accrued expenses and other liabilities	301	147
TOTAL LIABILITIES	10,611	10,457
Total Stockholders' Equity	134,516	86,777
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 145,127	$ 97,234