Note 10 - Fair Value of Financial Instruments (Details) - Fair Value Measured on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Jun. 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	$ 1,058,860	$ 1,019,871
Liabilities, carried at fair value on a recurring basis	29,642	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	770,545	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	770,545	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	264,184	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	23,953	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	288,137	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	178	2,081
Liabilities, carried at fair value on a recurring basis	254
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	178	2,081
Liabilities, carried at fair value on a recurring basis	254
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	29,388	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	29,388	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	1,034,907	995,713
Liabilities, carried at fair value on a recurring basis	254
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	23,953	24,158
Liabilities, carried at fair value on a recurring basis	$ 29,388	$ 29,570