Note 6 - Other Assets (Detail) - Other Assets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Federal Reserve Bank stock (1)	$ 14,069	[1]	$ 14,069	[1]
Federal Home Loan Bank stock (2)	6,615	[2]	7,353	[2]
Other investments	376		376
Total cost method equity investments	21,060		21,798
Corporate/bank-owned life insurance	45,535		45,579
Deferred taxes	42,645		42,449
LIHTC investments	20,119		20,631
Interest receivable	20,473		20,274
FDIC receivable	12,162		13,847
Prepaid assets	11,814		11,679
Other assets	11,845		11,829
Total other assets	$ 185,653		$ 188,086

[1] A bank applying for membership in the Federal Reserve System is required to subscribe to stock in the Federal Reserve Bank (FRB) in a sum equal to six percent of the bank's paid-up capital stock and surplus. One-half of the amount of the bank's subscription shall be paid to the FRB and the remaining half will be subject to call when deemed necessary by the Board of Governors of the Federal Reserve System.

[2] Borrowings from the Federal Home Loan Bank (FHLB) must be supported by capital stock holdings. The minimum activity-based requirement is 4.7% of the outstanding advances. The requirement may be adjusted from time to time by the FHLB within limits established in the FHLB's Capital Plan.