FDIC-assisted Acquisition: Schedule of Transfer of Net Assets in InterBank Acquisition (Details) (InterBank, USD $) In Thousands, unless otherwise specified	Apr. 27, 2012
InterBank
Net assets determined by the FDIC	$ 21,308
Cash transferred by the FDIC	40,810
Net assets per purchase and assumption agreement	62,118
Purchase accounting adjustments -- Loans	(107,816)
Purchase accounting adjustments -- Foreclosed real estate	(3,692)
Purchase accounting adjustments -- FDIC indemnification asset	83,989
Purchase accounting adjustments -- Deposits	(1,972)
Purchase accounting adjustments -- Investments	(114)
Purchase and Assumption Agreement Core deposit intangible	1,017
Other adjustments	(2,218)
Purchase and Assumption Agreement Gain recognized on business acquisition	$ 31,312