Note 5 - Loan Servicing (Detail) - Mortgage Loans Serviced For Others (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Freddie Mac [Member]
Mortgage loan portfolios serviced for:
Mortgage Loan Portfolios Serviced For	$ 605,000	$ 601,710
Fannie Mae [Member]
Mortgage loan portfolios serviced for:
Mortgage Loan Portfolios Serviced For	1,140	1,446
Federal Home Loan Bank [Member]
Mortgage loan portfolios serviced for:
Mortgage Loan Portfolios Serviced For	$ 2,094	$ 2,757

Aggregate amount of servicing liabilities that are subsequently measured at fair value and servicing liabilities that are subsequently measured using the amortization method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Name:	us-gaap_ServicingLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant