Note 15 - Financial Derivatives (Details)	1 Months Ended	12 Months Ended
	May. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Note 15 - Financial Derivatives (Details) [Line Items]
Junior Subordinated Notes	$ 119,100,000	$ 119,136,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		(598,000)	$ (2,397,000)
Notional Amount of Option Contract			0
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Note 15 - Financial Derivatives (Details) [Line Items]
Derivative Asset, Number of Instruments Held	5
Derivative, Outstanding Notional Amount	$ 119,100,000	119,100,000
Derivative, Original Maturity	10 years
Derivative, Average Fixed Interest Rate	2.61%
Derivative, Average Variable Interest Rate	0.53%
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		(3,000,000)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Note 15 - Financial Derivatives (Details) [Line Items]
Derivative, Outstanding Notional Amount		$ 340,300,000	181,300,000
Derivative, Average Fixed Interest Rate		4.69%
Derivative, Average Variable Interest Rate		3.51%
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		$ (1,300,000)	(489,000)
Derivative, Notional Amount at Origination		$ 347,200,000	347,200,000
Derivative, Average Basis Spread on Variable Rate		3.21%
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Interest Expense [Member] | Cash Flow Hedging [Member]
Note 15 - Financial Derivatives (Details) [Line Items]
Net Accrued on Interest Rate Swaps		$ 2,800,000	1,500,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Interest Income [Member] | Fair Value Hedging [Member]
Note 15 - Financial Derivatives (Details) [Line Items]
Net Accrued on Interest Rate Swaps		3,300,000	1,300,000
Cash [Member]
Note 15 - Financial Derivatives (Details) [Line Items]
Collateral Already Posted, Aggregate Fair Value		7,900,000
Negative Fair Value Member
Note 15 - Financial Derivatives (Details) [Line Items]
Notional Amount of Option Contract		9,400,000
Open Option Contracts, Fair Value		(28,000)
Sum of Spot and Forward Contract Notional Amount		115,400,000	178,900,000
Negative Fair Value		4,100,000	5,000,000
Positive Fair Value Member
Note 15 - Financial Derivatives (Details) [Line Items]
Sum of Spot and Forward Contract Notional Amount		100,600,000	167,000,000
Positive Fair Value		$ 3,300,000	$ 1,900,000
Minimum [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Note 15 - Financial Derivatives (Details) [Line Items]
Derivative, Original Maturity		2 years
Maximum [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Note 15 - Financial Derivatives (Details) [Line Items]
Derivative, Original Maturity		8 years