Note 15 - Financial Derivatives (Details)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	May. 31, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Note 15 - Financial Derivatives (Details) [Line Items]
Junior Subordinated Notes	$ 119,100,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		$ (2,558,000)	$ 100,000	$ (1,818,000)	$ (163,000)
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, Notional Amount	$ 119,100,000	119,100,000		119,100,000
Derivative, Original Maturity	10 years
Derivative, Average Fixed Interest Rate	2.61%
Derivative, Average Variable Interest Rate	0.33%
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax				(4,200,000)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Note 15 - Financial Derivatives (Details) [Line Items]
Derivative, Notional Amount		$ 338,100,000		$ 338,100,000		$ 342,800,000
Derivative, Average Fixed Interest Rate		4.69%		4.69%
Derivative, Average Variable Interest Rate		3.41%		3.41%
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax				$ (3,700,000)
Derivative, Average Basis Spread on Variable Rate		3.21%		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		$ 706,000	723,000	$ 2,100,000	824,000
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		831,000	$ 580,000	2,200,000	$ 606,000
Cash [Member]
Note 15 - Financial Derivatives (Details) [Line Items]
Collateral Already Posted, Aggregate Fair Value		10,600,000		10,600,000
Positive Fair Value Member
Note 15 - Financial Derivatives (Details) [Line Items]
Sum of Spot and Forward Contract Notional Amount		129,700,000		129,700,000		167,000,000
Increase (Decrease) in Fair Value				3,400,000		1,900,000
Negative Fair Value Member
Note 15 - Financial Derivatives (Details) [Line Items]
Sum of Spot and Forward Contract Notional Amount		$ 144,700,000		144,700,000		178,900,000
Increase (Decrease) in Fair Value				$ (4,900,000)		$ (5,000,000)
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				4 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