Note 14 - Commitments and Off-balance Sheet Risk - Instruments Carried at Fair Values (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Standby letters of credit	$ 821,338,000	$ 821,738,000
Standby Letters of Credit [Member]
Standby letters of credit	26,202,000	34,946,000
Standby letters of credit	$ 156,000	$ 182,000

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

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