Note 6 - Premises, Equipment and Other Assets (Detail) - Other assets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Cost method equity investments:
Federal Reserve Bank stock (1)	$ 14,069	$ 14,069
Federal Home Loan Bank stock (2)	7,353	9,441
Other investments	376	376
Total cost method equity investments	21,798	23,886
Corporate/bank-owned life insurance	45,579	42,856
Deferred taxes	42,449	37,615
LIHTC investments	20,631	22,447
Interest receivable	20,274	23,262
FDIC receivable	13,847	40,113
Prepaid assets	11,679	13,980
Other assets	11,829	22,707
Total other assets	$ 188,086	$ 226,866