Parent Company Financial Statements (Statements of Condition) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
ASSETS
Trading assets	$ 2,300	$ 2,244
Premises and equipment, net	28,059	24,113
Investment in subsidiaries:
Other assets	16,053	12,701
Total assets	2,564,757	2,302,720
LIABILITIES AND SHAREHOLDERS' EQUITY
Junior subordinated debentures	43,819	43,717
Accrued interest and other liabilities	41,310	36,245
Shareholders' equity	233,815	218,876	205,995	190,561
Total liabilities and shareholders' equity	2,564,757	2,302,720
Parent Company [Member]
ASSETS
Cash	19,510	18,661
Trading assets	2,300	2,244
Premises and equipment, net	4,846	4,896
Investment in subsidiaries:
Bank subsidiary	253,512	239,953
Other subsidiary	11,108	11,205
Amounts receivable from subsidiaries	2,643	1,572
Investments in CCTA and UBCT	1,331	1,331
Other assets	9,765	8,049
Total assets	305,015	287,911
LIABILITIES AND SHAREHOLDERS' EQUITY
Amounts due to subsidiaries	88
Junior subordinated debentures	43,819	43,717
Accrued interest and other liabilities	27,293	25,318
Shareholders' equity	233,815	218,876
Total liabilities and shareholders' equity	$ 305,015	$ 287,911