Note 11 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

Disclosure Text Block [Abstract]

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

March 31, 2016	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	$	224,804	$	-	$	-	$	224,804
U.S. government sponsored entities				100,010		-		100,010
Mortgage-backed securities		-		1,070,493		-		1,070,493
Collateralized mortgage obligations		-		34		-		34
Corporate debt securities		-		73,103		-		73,103
Mutual funds		5,915		-		-		5,915
Preferred stock of government sponsored entities		-		2,803		-		2,803
Other equity securities		-		7,962		-		7,962
Total securities available-for-sale		230,719		1,254,405		-		1,485,124
Warrants		-		-		94		94
Foreign exchange contracts		-		3,313		-		3,313
Total assets	$	230,719	$	1,257,718	$	94	$	1,488,531
Liabilities
Interest rate swaps	$	-	$	14,878	$	-	$	14,878
Foreign exchange contracts		-		913		-		913
Total liabilities	$	-	$	15,791	$	-	$	15,791

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

Fair Value Measurements, Nonrecurring [Table Text Block]

	March 31, 2016								Total Losses
	Fair Value Measurements Using						Total at		Three Months Ended
	Level 1		Level 2		Level 3		Fair Value		March 31, 2016		March 31, 2015
	(In thousands)
Assets
Impaired loans by type:
Commercial loans	$	-	$	-	$	2,493	$	2,493	$	-	$	-
Commercial mortgage loans		-		-		19,565		19,565		-		56
Residential mortgage loans and equity lines		-		-		11,971		11,971		-		148
Total impaired loans		-		-		34,029		34,029		-		204
Other real estate owned (1)		-		11,906		4,206		16,112		128		181
Investments in venture capital and private company stock		-		-		4,831		4,831		110		224
Total assets	$	-	$	11,906	$	43,066	$	54,972	$	238	$	609

	December 31, 2015								Total Losses
	Fair Value Measurements Using						Total at		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 loans 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