Note 4 - Loans and Allowance for Loan Losses (Detail) - Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Consumer:
Number of TDR loans	30
Balance on TDR loans (in Dollars)	$ 14,374
Accruing TDR Loans [Member] | Credit Cards [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Accruing TDR Loans [Member] | Student Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Accruing TDR Loans [Member] | Other Consumer [Member]
Consumer:
Number of TDR loans	3
Balance on TDR loans (in Dollars)	47
Accruing TDR Loans [Member] | Consumer Loans [Member]
Consumer:
Number of TDR loans	3
Balance on TDR loans (in Dollars)	47
Accruing TDR Loans [Member] | Construction Loans [Member]
Consumer:
Number of TDR loans	2
Balance on TDR loans (in Dollars)	1,209
Accruing TDR Loans [Member] | Single Family Residential Loans [Member]
Consumer:
Number of TDR loans	3
Balance on TDR loans (in Dollars)	575
Accruing TDR Loans [Member] | Other Commercial Real Estate Loans [Member]
Consumer:
Number of TDR loans	14
Balance on TDR loans (in Dollars)	9,259
Accruing TDR Loans [Member] | Real Estate Loans [Member]
Consumer:
Number of TDR loans	19
Balance on TDR loans (in Dollars)	11,043
Accruing TDR Loans [Member] | Other Commercial Loans [Member]
Consumer:
Number of TDR loans	4
Balance on TDR loans (in Dollars)	402
Accruing TDR Loans [Member] | Agricultural Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Accruing TDR Loans [Member] | Commercial Loans [Member]
Consumer:
Number of TDR loans	4
Balance on TDR loans (in Dollars)	402
Accruing TDR Loans [Member] | Other Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Accruing TDR Loans [Member]
Consumer:
Number of TDR loans	26
Balance on TDR loans (in Dollars)	11,492
Nonaccrual TDR Loans [Member] | Credit Cards [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Nonaccrual TDR Loans [Member] | Student Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Nonaccrual TDR Loans [Member] | Other Consumer [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Nonaccrual TDR Loans [Member] | Consumer Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Nonaccrual TDR Loans [Member] | Construction Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Nonaccrual TDR Loans [Member] | Single Family Residential Loans [Member]
Consumer:
Number of TDR loans	1
Balance on TDR loans (in Dollars)	21
Nonaccrual TDR Loans [Member] | Other Commercial Real Estate Loans [Member]
Consumer:
Number of TDR loans	3
Balance on TDR loans (in Dollars)	2,861
Nonaccrual TDR Loans [Member] | Real Estate Loans [Member]
Consumer:
Number of TDR loans	4
Balance on TDR loans (in Dollars)	2,882
Nonaccrual TDR Loans [Member] | Other Commercial Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Nonaccrual TDR Loans [Member] | Agricultural Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Nonaccrual TDR Loans [Member] | Commercial Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Nonaccrual TDR Loans [Member] | Other Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Nonaccrual TDR Loans [Member]
Consumer:
Number of TDR loans	4
Balance on TDR loans (in Dollars)	2,882
Credit Cards [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Student Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Other Consumer [Member]
Consumer:
Number of TDR loans	3
Balance on TDR loans (in Dollars)	47
Consumer Loans [Member]
Consumer:
Number of TDR loans	3
Balance on TDR loans (in Dollars)	47
Construction Loans [Member]
Consumer:
Number of TDR loans	2
Balance on TDR loans (in Dollars)	1,209
Single Family Residential Loans [Member]
Consumer:
Number of TDR loans	4
Balance on TDR loans (in Dollars)	596
Other Commercial Real Estate Loans [Member]
Consumer:
Number of TDR loans	17
Balance on TDR loans (in Dollars)	12,120
Real Estate Loans [Member]
Consumer:
Number of TDR loans	23
Balance on TDR loans (in Dollars)	13,925
Other Commercial Loans [Member]
Consumer:
Number of TDR loans	4
Balance on TDR loans (in Dollars)	402
Agricultural Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	0
Commercial Loans [Member]
Consumer:
Number of TDR loans	4
Balance on TDR loans (in Dollars)	402
Other Loans [Member]
Consumer:
Number of TDR loans	0
Balance on TDR loans (in Dollars)	$ 0