Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Summary of intangible assets
Gross Carrying Amount	$ 21,443
Accumulated Amortization	(8,285)
Net Carrying Amount	13,158
Core deposit intangibles [Member]
Summary of intangible assets
Gross Carrying Amount	14,800
Accumulated Amortization	(6,402)
Net Carrying Amount	8,398
Customer relationship intangibles [Member]
Summary of intangible assets
Gross Carrying Amount	5,657
Accumulated Amortization	(1,812)
Net Carrying Amount	3,845
Mortgage Servicing Intangibles [Member]
Summary of intangible assets
Gross Carrying Amount	986
Accumulated Amortization	(71)
Net Carrying Amount	$ 915