Note 4 - Investment Securities (Detail) - Single Payer Trust Preferred Securities (Parentheticals)	Dec. 31, 2012
Sterling Bancorp Trust I [Member]
Interest Rate	8.375%
Npb Capital Trust Ii [Member]
Interest Rate	7.85%
Capital One Capital II [Member]
Interest Rate	7.50%
Capital One Capital VI [Member]
Interest Rate	8.875%
Citigroup Capital Vii [Member]
Interest Rate	7.125%
Citigroup Capital Viii [Member]
Interest Rate	6.95%
Citigroup Capital Ix [Member]
Interest Rate	6.00%
Citigroup Capital X [Member]
Interest Rate	6.10%
Citigroup Capital XI [Member]
Interest Rate	6.00%
Citigroup Capital Xvii [Member]
Interest Rate	6.35%
First Tennessee Capital Ii [Member]
Interest Rate	6.30%
Goldman Sach Capital I [Member]
Interest Rate	6.345%
Keycorp Capital Vii [Member]
Interest Rate	6.875%
Mellon Capital IV [Member]
Interest Rate	4.00%
Jp Morgan Chase Capital Xi [Member]
Interest Rate	5.875%
Morgan Stanley Capital Trust Iii [Member]
Interest Rate	6.25%
USB Capital IX [Member]
Interest Rate	3.50%
Vnb Capital Trust I [Member]
Interest Rate	7.75%
Wells Fargo Capital Trust Vii [Member]
Interest Rate	5.85%
Wells Fargo Capital Trust Viii [Member]
Interest Rate	5.625%
Wells Fargo Capital Ix [Member]
Interest Rate	5.625%