Note 8 - Deposits and Borrowed Funds (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Deposits	$ 4,232,492	$ 4,249,921
Demand Deposit Overdrafts	6,307	3,087
Interest Expense, Time Deposits, $100,000 or More	1,530	2,296
Short-term Debt	53,687	115,689
Long-term Federal Home Loan Bank Advances	25,799	26,023
Restricted Pledged Loans	32,084	35,894
Federal Home Loan Bank Advance Maturity Next Fiscal Year	5,000
Federal Home Loan Bank Advance Maturity Year Three	20,000
Securities Sold under Agreements to Repurchase	10,000	10,000
Line of Credit Facility, Maximum Borrowing Capacity	35,000
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Unsecured Debt	15,000	15,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	5.31%
Short-term Debt [Member]
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	74,497
Securities Sold Under Agreement To Repurchase [Member]
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	$ 11,987