Note 4 - Debt and Equity Securities (Details) - Collateralized mortgage obligations: (USD $) In Thousands, unless otherwise specified							9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2013 Private Issue CMO [Member] CA [Member] CMO Security 1 [Member]	Sep. 30, 2013 Private Issue CMO [Member] CA [Member] CMO Security 2 [Member]	Sep. 30, 2013 Private Issue CMO [Member] CA [Member] CMO Security 3 [Member]	Sep. 30, 2013 Private Issue CMO [Member] CA [Member] CMO Security 4 [Member]	Sep. 30, 2013 Private Issue CMO [Member] CA [Member] CMO Security 5 [Member]	Sep. 30, 2013 Private Issue CMO [Member] FL [Member] CMO Security 3 [Member]	Sep. 30, 2013 Private Issue CMO [Member] FL [Member] CMO Security 4 [Member]	Sep. 30, 2013 Private Issue CMO [Member] VA [Member] CMO Security 5 [Member]	Sep. 30, 2013 Private Issue CMO [Member] NY [Member] CMO Security 1 [Member]	Sep. 30, 2013 Private Issue CMO [Member] NY [Member] CMO Security 4 [Member]	Sep. 30, 2013 Private Issue CMO [Member] NY [Member] CMO Security 5 [Member]	Sep. 30, 2013 Private Issue CMO [Member] NJ [Member] CMO Security 5 [Member]	Sep. 30, 2013 Private Issue CMO [Member] TX [Member] CMO Security 4 [Member]	Sep. 30, 2013 Private Issue CMO [Member] CO [Member] CMO Security 2 [Member]	Sep. 30, 2013 Private Issue CMO [Member] CMO Security 1 [Member]	Sep. 30, 2013 Private Issue CMO [Member] CMO Security 2 [Member]	Sep. 30, 2013 Private Issue CMO [Member] CMO Security 3 [Member]	Sep. 30, 2013 Private Issue CMO [Member] CMO Security 4 [Member]	Sep. 30, 2013 Private Issue CMO [Member] CMO Security 5 [Member]	Sep. 30, 2013 Private Issue CMO [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,061,918																				$ 8,287	$ 3,206	$ 3,956	$ 2,538	$ 3,678	$ 21,665
Fair Value	1,058,554		949,566																		8,179	2,822	3,723	2,173	3,297	20,194
Outstanding Principal																					9,541	3,447	4,425	3,492	3,954	24,859
Cumulative OTTI Charges Recorded	$ 6,923	$ 6,193	$ 6,178	$ 6,753	$ 6,938	$ 6,922															$ 3,966	$ 931	$ 1,341	$ 1,266	$ 222	$ 7,726
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																					Caa3	D	D	D	CC
Collateral Located in							42.00%	55.00%	36.00%	41.00%	23.00%	15.00%	13.00%	17.00%	16.00%	13.00%	13.00%	14.00%	10.00%	11.00%
Average FICO Score																					718	740	711	687	709