Note 10 - Derivative Financial Instruments - Derivative Financial Instruments (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Interest rate swaps, notional amount		$ 347,503	$ 253,414
Interest rate swaps, net carrying value	[1]	765	2,964
Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount		261,200	217,100
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest rate swaps, notional amount		50,000	0
Not Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount		36,300	36,300
Interest Rate Swap [Member]
Interest rate swaps, notional amount		279,500	235,400
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Interest rate swaps, notional amount		176,408	182,177
Interest rate swaps, net carrying value	[1]	5,410	6,350
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest rate swaps, notional amount		50,000
Interest rate swaps, net carrying value	[1]	(118)
Interest Rate Swaps 1 [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Interest rate swaps, notional amount		84,774	34,916
Interest rate swaps, net carrying value	[1]	(1,482)	(658)
Interest Rate Swaps 2 [Member] | Not Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount		36,321	36,321
Interest rate swaps, net carrying value	[1]	$ (3,045)	$ (2,728)

[1] Derivatives in a net positive position are recorded as "Other assets" and derivatives in a net negative position are recorded as "Other liabilities" in the Consolidated Statements of Financial Condition.