Note 16 - Disclosures About Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

			Fair Value Measurements
(In thousands)	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
December 31, 2015
ASSETS
Available-for-sale securities
U.S. Treasury	$	3,994	$	3,994	$	--	$	--
U.S. Government agencies		120,237		--		120,237		--
Mortgage-backed securities		647,426		--		647,426		--
States and political subdivisions		9,874		--		9,874		--
Other securities		39,876		--		39,876		--
Assets held in trading accounts		4,422		2,409		2,013		--
December 31, 2014
ASSETS
Available-for-sale securities
U.S. Treasury	$	3,992		3,992	$	--	$
U.S. Government agencies		272,816		--		272,816		--
Mortgage-backed securities		1,572		--		1,572		--
States and political subdivisions		6,540		--		6,540		--
Other securities		20,363		--		20,363		--
Assets held in trading accounts		6,987		3,320		3,667		--

Fair Value Measurements, Nonrecurring [Table Text Block]

			Fair Value Measurements Using
(In thousands)	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
December 31, 2015
Impaired loans (1) (2) (collateral dependent)	$	19,027	$	--	$	--	$	19,027
Foreclosed assets held for sale (1)		14,459		--		--		14,459
December 31, 2014
Impaired loans (1) (2) (collateral dependent)	$	12,276	$	--	$	--	$	12,276
Foreclosed assets held for sale (1)		3,417		--		--		3,417

Fair Value, by Balance Sheet Grouping [Table Text Block]

	Carrying		Fair Value Measurements
(In thousands)	Amount		Level 1		Level 2		Level 3		Total
December 31, 2015
Financial assets:
Cash and cash equivalents	$	252,262	$	252,262	$	--	$	--	$	252,262
Interest bearing balances due from banks - time		14,107		--		14,105		--		14,105
Held-to-maturity securities		705,373		--		713,371		--		713,371
Mortgage loans held for sale		30,265		--		--		30,265		30,265
Interest receivable		25,793		--		25,793		--		25,793
Legacy loans (net of allowance)		3,215,103		--		--		3,204,153		3,204,153
Loans acquired (net of allowance)		1,672,901		--		--		1,667,204		1,667,204
Financial liabilities:
Non-interest bearing transaction accounts		1,280,234		--		1,280,234		--		1,280,234
Interest bearing transaction accounts and savings deposits		3,485,845		--		3,485,845		--		3,485,845
Time deposits		1,320,017		--		--		1,315,254		1,315,254
Federal funds purchased and securities sold under agreements to repurchase		99,398		--		99,398		--		99,398
Other borrowings		162,289		--		168,254		--		168,254
Subordinated debentures		60,570		--		55,954		--		55,954
Interest payable		1,800		--		1,800		--		1,800
December 31, 2014
Financial assets
Cash and cash equivalents	$	335,909	$	335,909	$	--	$	--	$	335,909
Held-to-maturity securities		777,587		--		780,533		--		780,533
Mortgage loans held for sale		21,265		--		--		21,265		21,265
Interest receivable		16,774		--		16,774		--		16,774
Legacy loans (net of allowance)		2,024,693		--		--		2,022,889		2,022,889
Loans acquired, not covered by FDIC loss share		575,980		--		--		560,651		560,651
Loans acquired, covered by FDIC loss share (net of allowance)		106,933		--		--		105,789		105,789
FDIC indemnification asset		22,663		--		--		22,663		22,663
Financial liabilities:
Non-interest bearing transaction accounts		889,260		--		889,260		--		889,260
Interest bearing transaction accounts and savings deposits		2,006,271		--		2,006,271		--		2,006,271
Time deposits		965,187		--		--		967,900		967,900
Federal funds purchased and securities sold under agreements to repurchase		110,586		--		110,586		--		110,586
Other borrowings		114,682		--		114,698		--		114,698
Subordinated debentures		20,620		--		16,115		--		16,115
Interest payable		1,147		--		1,147		--		1,147