Note 2 - Investment Securities (Detail) - Single-Issuer Trust preferred Securities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Fair Value	$ 277,947		$ 296,837
Sterling Bancorp Trust I [Member]
TARP Recipient	Yes	[1]
Credit Rating	NA
Amortized Cost	991
Fair Value	1,102
Unrealized Gain/(Loss)	111
ABN Amro NA Holding Cap, Owned by Bank of America [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB+
Amortized Cost	500
Fair Value	500
Allfirst Pfd Cap Trust Floating Rate Owned By M and T Bank Corporation [Member]
TARP Recipient	Yes	[1]
Credit Rating	BBB
Amortized Cost	383
Fair Value	415
Unrealized Gain/(Loss)	32
Citigroup Capital Vii [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB
Amortized Cost	2,114
Fair Value	2,129
Unrealized Gain/(Loss)	15
Citigroup Capital Viii [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB
Amortized Cost	1,683
Fair Value	1,694
Unrealized Gain/(Loss)	11
Citigroup Capital Ix [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB
Amortized Cost	3,310
Fair Value	3,486
Unrealized Gain/(Loss)	176
Citigroup Capital X [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB
Amortized Cost	1,256
Fair Value	1,278
Unrealized Gain/(Loss)	22
Citigroup Capital XI [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB
Amortized Cost	1,153
Fair Value	1,165
Unrealized Gain/(Loss)	12
Citigroup Capital XV [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB
Amortized Cost	234
Fair Value	234
Citigroup Capital Xvii [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB
Amortized Cost	46
Fair Value	63
Unrealized Gain/(Loss)	17
Countrywide Capital IV, Owned by Bank of America [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB+
Amortized Cost	149
Fair Value	150
Unrealized Gain/(Loss)	1
Countrywide Capital V, Owned by Bank of America [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB+
Amortized Cost	2,507
Fair Value	2,555
Unrealized Gain/(Loss)	48
First Tennessee Capital Ii [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB
Amortized Cost	5,120
Fair Value	5,291
Unrealized Gain/(Loss)	171
Goldman Sachs Capital [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB+
Amortized Cost	850
Fair Value	841
Unrealized Gain/(Loss)	(9)
Goldman Sach Capital I [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB+
Amortized Cost	8,912
Fair Value	9,377
Unrealized Gain/(Loss)	465
Keycorp Capital Ii [Member]
TARP Recipient	Yes	[1]
Credit Rating	BBB-
Amortized Cost	93
Fair Value	100
Unrealized Gain/(Loss)	7
Mellon Capital IV [Member]
TARP Recipient	Yes	[1]
Credit Rating	BBB
Amortized Cost	118
Fair Value	120
Unrealized Gain/(Loss)	2
JP Morgan Chase Capital XIII [Member]
TARP Recipient	Yes	[1]
Credit Rating	BBB
Amortized Cost	762
Fair Value	830
Unrealized Gain/(Loss)	68
Jp Morgan Chase Capital Xi [Member]
TARP Recipient	Yes	[1]
Credit Rating	BBB
Amortized Cost	1,623
Fair Value	1,632
Unrealized Gain/(Loss)	9
Morgan Stanley Capital Trust V [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB+
Amortized Cost	2,005
Fair Value	2,000
Unrealized Gain/(Loss)	(5)
Morgan Stanley Capital Trust Iii [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB+
Amortized Cost	1,045
Fair Value	1,125
Unrealized Gain/(Loss)	80
PNC Financial Services [Member]
TARP Recipient	Yes	[1]
Credit Rating	BBB
Amortized Cost	460
Fair Value	465
Unrealized Gain/(Loss)	5
Suntrust Capital I Floating Rate [Member]
TARP Recipient	Yes	[1]
Credit Rating	BB+
Amortized Cost	736
Fair Value	815
Unrealized Gain/(Loss)	79
USB Capital IX [Member]
TARP Recipient	Yes	[1]
Credit Rating	BBB+
Amortized Cost	90
Fair Value	93
Unrealized Gain/(Loss)	3
Vnb Capital Trust I [Member]
TARP Recipient	Yes	[1]
Credit Rating	BBB-
Amortized Cost	21
Fair Value	21
Single Issuer Trust Preferred Securities [Member]
Amortized Cost	36,161
Fair Value	37,481
Unrealized Gain/(Loss)	$ 1,320

[1] TARP obligation was repaid prior to March 31, 2013.