Note 6 - Other Assets (Details) - Other Assets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Other Assets [Abstract]
Federal Reserve Bank stock (1)	$ 14,069	[1]	$ 14,069	[1]
Federal Home Loan Bank stock (2)	5,865	[2]	7,353	[2]
Other investments	376		376
Total cost method equity investments	20,310		21,798
Life insurance cash surrender value	46,056		45,579
Deferred taxes receivable	52,486		42,449
Limited partnership investments	19,219		20,631
Interest receivable	20,186		20,274
FDIC indemnification receivable	8,758		13,847
Prepaid assets	3,180		11,679
Other assets	11,265		11,829
Total other assets	$ 181,460		$ 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.