Note 3 - Investment Securities (Details) - Trust Preferred Securities $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Note 3 - Investment Securities (Details) - Trust Preferred Securities [Line Items]
Amortized cost	$ 288,792	$ 185,250
Fair value	284,795	185,379
Unrealized losses	(5,396)	(2,271)
Cumulative OTTI life to date	$ 930	3,966	$ 3,959
TPREF Funding II [Member]
Note 3 - Investment Securities (Details) - Trust Preferred Securities [Line Items]
Class / tranche	Class B Notes
Amortized cost	$ 732
Fair value	416
Unrealized losses	$ (316)
Lowest credit rating assigned	C
Number of banks currently performing	20
Deferrals / defaults as % of current balance	36.00%
Conditional default rates for 2013 and beyond	0.39%
Cumulative OTTI life to date	$ 267
TPREF Funding III [Member]
Note 3 - Investment Securities (Details) - Trust Preferred Securities [Line Items]
Class / tranche	Class B2 Notes
Amortized cost	$ 1,518
Fair value	901
Unrealized losses	$ (617)
Lowest credit rating assigned	C
Number of banks currently performing	15
Deferrals / defaults as % of current balance	32.00%
Conditional default rates for 2013 and beyond	0.42%
Cumulative OTTI life to date	$ 483
ALESCO Preferred Funding V [Member]
Note 3 - Investment Securities (Details) - Trust Preferred Securities [Line Items]
Class / tranche	Class C1 Notes
Amortized cost	$ 820
Fair value	566
Unrealized losses	$ (254)
Lowest credit rating assigned	C
Number of banks currently performing	40
Deferrals / defaults as % of current balance	17.00%
Conditional default rates for 2013 and beyond	0.32%
Cumulative OTTI life to date	$ 180
Collateralized Debt Obligations [Member]
Note 3 - Investment Securities (Details) - Trust Preferred Securities [Line Items]
Amortized cost	3,070	5,261
Fair value	1,883	3,193
Unrealized losses	$ (1,187)	$ (2,068)
Number of banks currently performing	75
Deferrals / defaults as % of current balance	28.00%
Cumulative OTTI life to date	$ 930

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Represents conditional default rates for 2014 and beyond.

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Represents the number of banks currently performing.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Name Accounting Standards Codification
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch).

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The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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