Note 14 - Derivatives (Details) - Gains (Losses) on Derivatives and Location on Income Statement - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Forward Starting Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)		$ 2,721	$ 295
Interest on FHLB [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	[1]	396	$ 295
Other Noninterest Income [Member] | Forward Starting Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	[2]	$ 2,325

[1] Losses represent tax effected amounts reclassified from accumulated other comprehensive income pertaining to net settlements recorded during the period on active interest rate swaps.

[2] Losses represent tax effected amounts reclassified from accumulated other comprehensive income pertaining to the terminated active and forward starting interest rate swaps.