Other Noninterest Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Components of other income
Income from bank owned life insurance	$ 2,891	$ 1,321
Safety deposit box income	534	251
Credit related fees	1,969	346
Income from derivatives	908
Gain on sale of assets	81	597
Other miscellaneous income	2,407	899
Total other noninterest income	$ 8,790	$ 3,414