Note 4 - Debt and Equity Securities (Details) - Collateralized mortgage obligations: (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 1 [Member] CA [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 1 [Member] NY [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 1 [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 2 [Member] CA [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 2 [Member] CO [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 2 [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 3 [Member] CA [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 3 [Member] FL [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 3 [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 4 [Member] CA [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 4 [Member] FL [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 4 [Member] NY [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 4 [Member] TX [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 4 [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 5 [Member] CA [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 5 [Member] VA [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 5 [Member] NY [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 5 [Member] NJ [Member]	Jun. 30, 2013 Private Issue CMO [Member] CMO Security 5 [Member]	Jun. 30, 2013 Private Issue CMO [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost					$ 9,027			$ 3,613			$ 4,301					$ 3,129					$ 4,051	$ 24,121
Fair Value	1,040,723	949,566			9,084			3,134			3,964					3,169					3,579	22,930
Outstanding Principal					10,037			3,854			4,661					3,705					4,327	26,584
Cumulative OTTI Charges Recorded					$ 3,705			$ 931			$ 1,108					$ 843					$ 222	$ 6,809
Year of Issuance					2006			2006			2006					2006					2006
Maturity					05/25/36			08/19/36			08/25/36					08/25/36					05/25/36
Current Lowest Rating					D			D			D					D					CC
Collateral Located in			40.00%	16.00%		54.00%	11.00%		35.00%	15.00%		42.00%	14.00%	12.00%	10.00%		21.00%	23.00%	12.00%	13.00%
Average FICO Score					717			738			711					723					709