Note 1 - Significant Accounting Policies (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 shares	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 shares	Dec. 31, 2014 USD ($)
Note 1 - Significant Accounting Policies (Details) [Line Items]
Number of Second-Tier Subsidiaries			2
Number of Unconsolidated Business Trusts Formed to Issue Trust Preferred Securities	5		5
Interest Income on Commercial and Mortgage Loans, Discontinued Period			90 days
Maximum Delinquency Period for Consumer and Credit Card Loans to be Charged-off			120 days
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage (in Dollars) | $	$ 2.1		$ 2.1		$ 1.6
Mortgage Loans [Member]
Note 1 - Significant Accounting Policies (Details) [Line Items]
Servicing Asset (in Dollars) | $	$ 603.0		$ 603.0
Restricted Stock [Member]
Note 1 - Significant Accounting Policies (Details) [Line Items]
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights	98,000		98,000
Employee Stock Option [Member]
Note 1 - Significant Accounting Policies (Details) [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	106,000	141,000	106,000	141,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	103,000	175,000	103,000	175,000
Core Deposits [Member]
Note 1 - Significant Accounting Policies (Details) [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			10 years