Loans and Asset Quality Information (Details 6) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Information related to impaired loans:
Impaired loans at period end	$ 125,581	$ 152,731	$ 106,838
Average amount of impaired loans for period	119,173	143,172	139,971
Impaired loans with related allowance - Related Allowance	10,660	16,209	8,560
Impaired loans with no related allowance - Recorded Investment	63,780	62,848	47,245
Non-covered
Information related to impaired loans:
Impaired loans at period end	68,445	94,602	57,882
Average amount of impaired loans for period	63,208	86,723	85,198
Impaired loans with related allowance - Related Allowance	5,960	11,051	5,051
Impaired loans with no related allowance - Recorded Investment	20,072	22,235	12,049
Covered
Information related to impaired loans:
Impaired loans at period end	57,136	58,129	48,956
Average amount of impaired loans for period	55,965	56,449	54,773
Impaired loans with related allowance - Related Allowance	4,700	5,158	3,509
Impaired loans with no related allowance - Recorded Investment	$ 43,708	$ 40,613	$ 35,196