Note 2 - Investment Securities (Detail) - Single-Issuer Trust preferred Securities (Parentheticals)	Mar. 31, 2013
Sterling Bancorp Trust I [Member]
Interest Rate	8.375%
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 XV [Member]
Interest Rate	6.50%
Citigroup Capital Xvii [Member]
Interest Rate	6.35%
Countrywide Capital IV, Owned by Bank of America [Member]
Interest Rate	6.75%
Countrywide Capital V, Owned by Bank of America [Member]
Interest Rate	7.00%
First Tennessee Capital Ii [Member]
Interest Rate	6.30%
Goldman Sach Capital I [Member]
Interest Rate	6.345%
Keycorp Capital Ii [Member]
Interest Rate	6.875%
Jp Morgan Chase Capital Xi [Member]
Interest Rate	5.875%
Morgan Stanley Capital Trust V [Member]
Interest Rate	5.75%
Morgan Stanley Capital Trust Iii [Member]
Interest Rate	6.25%
Vnb Capital Trust I [Member]
Interest Rate	7.75%