Fair Value Measurement (Details 3) (Fair value nonrecurring basis [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	$ 24,341	$ 21,790
Gain loss on fair value assets valuation	(1,975)	(417)
Impaired originated & PNCI loans [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	23,989	21,110
Gain loss on fair value assets valuation	(1,948)	(334)
Foreclosed assets [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	352	680
Gain loss on fair value assets valuation	(27)	(83)
Level 1 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value
Level 1 [Member] | Impaired originated & PNCI loans [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value
Level 1 [Member] | Foreclosed assets [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value
Level 2 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value
Level 2 [Member] | Impaired originated & PNCI loans [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value
Level 2 [Member] | Foreclosed assets [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value
Level 3 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	24,341	21,790
Level 3 [Member] | Impaired originated & PNCI loans [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	23,989	21,110
Level 3 [Member] | Foreclosed assets [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	$ 352	$ 680