Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis [Line Items]
Assets, carried at fair value on a recurring basis	$ 984,551	$ 1,019,871
Liabilities, carried at fair value on a recurring basis	30,070	29,570
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis [Line Items]
Assets, carried at fair value on a recurring basis	696,209	756,156
Collateralized Mortgage Backed Securities [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis [Line Items]
Assets, carried at fair value on a recurring basis	696,209	756,156
Other securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis [Line Items]
Assets, carried at fair value on a recurring basis	262,097	237,476
Other securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis [Line Items]
Assets, carried at fair value on a recurring basis	26,071	24,158
Other securities [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis [Line Items]
Assets, carried at fair value on a recurring basis	288,168	261,634
Interest rate swaps [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis [Line Items]
Assets, carried at fair value on a recurring basis	174	2,081
Liabilities, carried at fair value on a recurring basis	535
Interest rate swaps [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis [Line Items]
Assets, carried at fair value on a recurring basis	174	2,081
Liabilities, carried at fair value on a recurring basis	535
Borrowings [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis [Line Items]
Liabilities, carried at fair value on a recurring basis	29,535	29,570
Borrowings [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis [Line Items]
Liabilities, carried at fair value on a recurring basis	29,535	29,570
Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis [Line Items]
Assets, carried at fair value on a recurring basis	958,480	995,713
Liabilities, carried at fair value on a recurring basis	535
Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis [Line Items]
Assets, carried at fair value on a recurring basis	26,071	24,158
Liabilities, carried at fair value on a recurring basis	$ 29,535	$ 29,570