Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Detail) - TDRs By Class (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Commercial Loan [Member]
Accruing	$ 519		$ 1,451
Non-accrual	2,545	[1]	897	[1]
Total	3,064		2,348
Agricultural [Member]
Accruing	0		0
Non-accrual	0	[1]	0	[1]
Total	0		0
Office Retail And Industrial [Member]
Accruing	0		1,742
Non-accrual	2,407	[1]	0	[1]
Total	2,407		1,742
Multi-Family [Member]
Accruing	0		11,107
Non-accrual	150	[1]	1,758	[1]
Total	150		12,865
Residential Construction [Member]
Accruing	0		0
Non-accrual	0	[1]	0	[1]
Total	0		0
Commercial Construction [Member]
Accruing	0		0
Non-accrual	0	[1]	14,006	[1]
Total			14,006
Other Commercial Real Estate [Member]
Accruing	5,206		227
Non-accrual	4,649	[1]	11,417	[1]
Total	9,855		11,644
Commercial Real Estate [Member]
Accruing	5,206		13,076
Non-accrual	7,206	[1]	27,181	[1]
Total	12,412		40,257
Total Corporate Loans [Member]
Accruing	5,725		14,527
Non-accrual	9,751	[1]	28,078	[1]
Total	15,476		42,605
Home Equity Line of Credit [Member]
Accruing	40		1,093
Non-accrual	234	[1]	471	[1]
Total	274		1,564
Residential Mortgage [Member]
Accruing	1,102		2,089
Non-accrual	939	[1]	1,293	[1]
Total	2,041		3,382
Installment Loans [Member]
Accruing	0		155
Non-accrual	0	[1]	0	[1]
Total			155
Total Consumer Loans [Member]
Accruing	1,142		3,337
Non-accrual	1,173	[1]	1,764	[1]
Total	2,315		5,101
Total Loans [Member]
Accruing	6,867		17,864
Non-accrual	10,924	[1]	29,842	[1]
Total	$ 17,791		$ 47,706

[1] These loans are included in non-accrual loans in the preceding tables.