Note 19 - Derivative Financial Instruments - Derivative Financial Instruments (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Interest rate swaps, notional amount		$ 739,726	$ 253,414
Interest rate swaps, net carrying value	[1]	3,630	2,964
Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount		261,900	217,100
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest rate swaps, notional amount		441,500	0
Not Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount		36,300	36,300
Interest Rate Swaps 1 [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Interest rate swaps, notional amount		199,341	182,177
Interest rate swaps, net carrying value	[1]	6,971	6,350
Interest Rate Swaps 1 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest rate swaps, notional amount		250,000
Interest rate swaps, net carrying value	[1]	417
Interest Rate Swaps 2 [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Interest rate swaps, notional amount		62,564	34,916
Interest rate swaps, net carrying value	[1]	(921)	(658)
Interest Rate Swaps 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest rate swaps, notional amount		191,500
Interest rate swaps, net carrying value	[1]	(7)
Interest Rate Swap [Member]
Interest rate swaps, notional amount		280,200	235,400
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest rate swaps, notional amount		36,321	36,321
Interest rate swaps, net carrying value	[1]	$ (2,830)	$ (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.