Note 14 - Financial Derivatives (Details) - USD ($)	1 Months Ended	3 Months Ended
	May. 31, 2014	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Note 14 - 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		$ (3,120,000)	$ (1,588,000)
Notional Amount of Option Contract		0
Negative Fair Value		913,000
Cash [Member]
Note 14 - Financial Derivatives (Details) [Line Items]
Collateral Already Posted, Aggregate Fair Value		13,300,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Note 14 - Financial Derivatives (Details) [Line Items]
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	0.63%
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		(6,100,000)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Note 14 - Financial Derivatives (Details) [Line Items]
Derivative, Outstanding Notional Amount		$ 357,500,000
Derivative, Average Fixed Interest Rate		4.68%
Derivative, Average Variable Interest Rate		3.64%
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		$ (4,300,000)
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 14 - Financial Derivatives (Details) [Line Items]
Net Accrued on Interest Rate Swaps		$ 620,000	703,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Interest Expense [Member] | Fair Value Hedging [Member]
Note 14 - Financial Derivatives (Details) [Line Items]
Net Accrued on Interest Rate Swaps		934,000	$ 683,000
Positive Fair Value Member
Note 14 - Financial Derivatives (Details) [Line Items]
Sum of Spot and Forward Contract Notional Amount		138,200,000		$ 100,600,000
Positive Fair Value		3,300,000		3,300,000
Negative Fair Value Member
Note 14 - Financial Derivatives (Details) [Line Items]
Notional Amount of Option Contract				9,400,000
Sum of Spot and Forward Contract Notional Amount		$ 73,000,000		115,400,000
Negative Fair Value				4,100,000
Open Option Contracts, Fair Value				$ 28,000
Minimum [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Note 14 - 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 14 - Financial Derivatives (Details) [Line Items]
Derivative, Original Maturity		8 years