FDIC-assisted Acquisition: Schedule of Fair Value of Assets and Liabilities of InterBank Acquisition (Details) (InterBank, USD $) In Thousands, unless otherwise specified	Apr. 27, 2012
Assets
InterBank Acquisition Cash	$ 493
InterBank Acquisition Due From Banks	74,834
InterBank Acquisition Cash and Cash Equivalents	75,327
InterBank Acquisition Investment Securities	34,914
InterBank Acquisition Loans Receivable Net	285,458	[1]
InterBank Acquisition Foreclosed Real Estate	6,216
InterBank Acquisition FDIC Indemnification Asset	83,989
InterBank Acquisition Federal Home Loan Bank of Des Moines Stock	585
InterBank Acquisition Accrued Interest Receivable	1,672
InterBank Acquisition Core Deposit Intangible	1,017
InterBank Acquisition Other Assets	873
InterBank Acquisition Total Assets Acquired	490,051
Liabilities
InterBank Acquisition Demand and Savings Deposits	97,838
InterBank Acquisition Time Deposits	358,414
InterBank Acquisition Total Deposits	456,252
InterBank Acquisition Accounts Payable	2,272
InterBank Acquisition Accrued Interest Payable	197
InterBank Acquisition Other Liabilities	18
InterBank Acquisition Total Liabilities Assumed	458,739
InterBank Acquisition Gain Recognized on Business Acquisition	$ 31,312

[1] Net of discount on loans purchased of $107,816