Note 16 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure Text Block [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

As of December 31, 2015	Fair Value Measurements Using						Total at
	Level 1		Level 2		Level 3		Fair Value
	(In thousands)
Assets
Securities available-for-sale
U.S. Treasury securities	$	284,288	$	-	$	-	$	284,288
U.S. government sponsored entities		-		148,160		-		148,160
Mortgage-backed securities		-		1,062,269		-		1,062,269
Collateralized mortgage obligations		-		36		-		36
Corporate debt securities		-		73,855		-		73,855
Mutual funds		5,833		-		-		5,833
Preferred stock of government sponsored entities		-		3,216		-		3,216
Other equity securities		-		8,695		-		8,695
Total securities available-for-sale		290,121		1,296,231		-		1,586,352
Warrants		-		-		62		62
Foreign exchange contracts		-		3,339		-		3,339
Total assets	$	290,121	$	1,299,570	$	62	$	1,589,753
Liabilities
Option contracts	$	-	$	28	$	-	$	28
Interest rate swaps		-		6,496		-		6,496
Foreign exchange contracts		-		4,124		-		4,124
Total liabilities	$	-	$	10,648	$	-	$	10,648

As of December 31, 2014	Fair Value Measurements Using						Total at
	Level 1		Level 2		Level 3		Fair Value
	(In thousands)
Assets
Securities available-for-sale
U.S. Treasury securities	$	664,004	$	-	$	-	$	664,004
Mortgage-backed securities		-		544,303		-		544,303
Collateralized mortgage obligations		-		45		-		45
Corporate debt securities		-		94,472		-		94,472
Mutual funds		5,866		-		-		5,866
Preferred stock of government sponsored entities		-		3,224		-		3,224
Other equity securities		-		7,021		-		7,021
Total securities available-for-sale		669,870		649,065		-		1,318,935
Warrants		-		-		27		27
Foreign exchange contracts		-		1,876		-		1,876
Total assets	$	669,870	$	650,941	$	27	$	1,320,838
Liabilities
Interest rate swaps	$	-	$	4,626	$	-	$	4,626
Foreign exchange contracts		-		5,007		-		5,007
Total liabilities	$	-	$	9,633	$	-	$	9,633

Fair Value Measurements, Nonrecurring [Table Text Block]

	As of December 31, 2015								Total Losses/(Gains)
	Fair Value Measurements Using						Total at		For the Twelve Months Ended
	Level 1		Level 2		Level 3		Fair Value		December 31, 2015		December 31, 2014
	(In thousands)
Assets
Impaired loans by type:
Commercial loans	$	-	$	-	$	6,317	$	6,317	$	806	$	17
Commercial mortgage loans		-		-		20,359		20,359		598		3,914
Residential mortgage and equity lines		-		-		13,009		13,009		146		27
Total impaired loans		-		-		39,685		39,685		1,550		3,958
Other real estate owned (1		-		10,047		4,235		14,282		404		202
Investments in venture capital and private company stock		-		-		4,922		4,922		553		436
Total assets	$	-	$	10,047	$	48,842	$	58,889	$	2,507	$	4,596

	As of December 31, 2014								Total Losses/(Gains)
	Fair Value Measurements Using						Total at		For the Twelve Months Ended
	Level 1		Level 2		Level 3		Fair Value		December 31, 2014		December 31, 2013
	(In thousands)
Assets
Impaired loans by type:
Commercial loans	$	-	$	-	$	3,774	$	3,774	$	17	$	5,731
Commercial mortgage loans		-		-		25,029		25,029		3,914		125
Construction- other		-		-		7,625		7,625		-		-
Residential mortgage and equity lines		-		-		13,126		13,126		27		213
Total impaired loans		-		-		49,554		49,554		3,958		6,069
Other real estate owned (1)		-		16,458		4,110		20,568		202		(3,134	)
Investments in venture capital and private company stock		-		-		5,495		5,495		436		409
Equity investments		-		-		617		617		-		-
Total assets	$	-	$	16,458	$	59,776	$	76,234	$	4,596	$	3,344