Parent Company Only Financial Information (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
ASSETS
Trading securities	$ 4,459	$ 3,233
Total Assets	1,773,079	1,602,207
LIABILITIES
Subordinated debentures	20,620	20,620
Total liabilities	1,627,715	1,470,318
Total shareholders' equity	145,364	131,889	109,645	69,409
Total Liabilities and Shareholders' Equity	1,773,079	1,602,207
Parent Company [Member]
ASSETS
Cash	2,029	1,936
Trading securities	229	175
Investment in bank subsidiary	138,195	126,242
Investment in non-bank subsidiaries	27,796	26,579
Deferred tax asset	883	839
Other assets	2,249	2,313
Total Assets	171,381	158,084
LIABILITIES
Borrowings from subsidiary	1,950	2,150
Subordinated debentures	20,620	20,620
Other liabilities	3,447	3,425
Total liabilities	26,017	26,195
Total shareholders' equity	145,364	131,889
Total Liabilities and Shareholders' Equity	$ 171,381	$ 158,084