Loans (Details 9) (Consumer loan [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consumer Credit Exposure
Credit risk profile based on payment activity	$ 1,607,370	$ 1,149,710
Performing [Member]
Consumer Credit Exposure
Credit risk profile based on payment activity	1,602,398	1,142,919
Nonperforming [Member]
Consumer Credit Exposure
Credit risk profile based on payment activity	4,972	6,791
Originated loans [Member]
Consumer Credit Exposure
Credit risk profile based on payment activity	1,074,611	1,008,395
Originated loans [Member] | Performing [Member]
Consumer Credit Exposure
Credit risk profile based on payment activity	1,070,756	1,001,774
Originated loans [Member] | Nonperforming [Member]
Consumer Credit Exposure
Credit risk profile based on payment activity	3,855	6,621
Acquired loans [Member]
Consumer Credit Exposure
Credit risk profile based on payment activity	386,540
Acquired loans [Member] | Performing [Member]
Consumer Credit Exposure
Credit risk profile based on payment activity	385,423
Acquired loans [Member] | Nonperforming [Member]
Consumer Credit Exposure
Credit risk profile based on payment activity	1,117
Covered loans [Member]
Consumer Credit Exposure
Credit risk profile based on payment activity	146,219	141,315
Covered loans [Member] | Performing [Member]
Consumer Credit Exposure
Credit risk profile based on payment activity	146,219	141,145
Covered loans [Member] | Nonperforming [Member]
Consumer Credit Exposure
Credit risk profile based on payment activity	$ 0	$ 170