Note 14 - Financial Derivatives (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Expense [Member]
Net Accrued on Interest Rate Swaps		$ 588,000	$ 706,000	$ 1,800,000	$ 2,100,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Outstanding, Notional Amount	$ 119,100,000
Derivative Original Maturity	10 years
Derivative, Average Fixed Interest Rate	2.61%
Derivative, Average Variable Interest Rate	0.85%
Derivative, Notional Amount		119,100,000		119,100,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		(6,600,000)
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Expense [Member]
Net Accrued on Interest Rate Swaps		879,000	831,000	$ 2,800,000	2,200,000
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Minimum [Member]
Derivative Original Maturity				4 years
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Maximum [Member]
Derivative Original Maturity				8 years
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Outstanding, Notional Amount		$ 358,300,000		$ 358,300,000
Derivative, Average Fixed Interest Rate		4.63%		4.63%
Derivative, Average Variable Interest Rate		3.70%		3.70%
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax				$ (3,800,000)
Derivative, Average Basis Spread on Variable Rate		3.18%		3.18%
Positive Fair Value [Member]
Sum Of Spot And Forward Contract Notional Amount		$ 107,100,000		$ 107,100,000		$ 100,600,000
Positive Fair Value		1,700,000		1,700,000		3,300,000
Negative Fair Value [Member]
Notional Amount Of Option Contract						9,400,000
Sum Of Spot And Forward Contract Notional Amount		45,000,000		45,000,000		115,400,000
Negative Fair Value		712,000		712,000		4,100,000
Open OptionContracts Fair Value						$ 28,000
Cash [Member]
Collateral Already Posted, Aggregate Fair Value		14,800,000		14,800,000
Notional Amount Of Option Contract		0		0
Junior Subordinated Notes	$ 119,100,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		$ 804,000	$ (2,558,000)	$ (3,598,000)	$ (1,818,000)