Note 2 - Acquisitions (Details) - Assets Acquired and Liabilities Assumed (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Nov. 25, 2013	Oct. 14, 2012	Oct. 19, 2012	Aug. 31, 2014	Sep. 14, 2012	Dec. 31, 2014	Dec. 31, 2013	Nov. 24, 2013
Deposits:
Goodwill						$ 108,095	$ 78,529
Cost Acquired [Member] | Delta Trust [Member]
Assets Acquired
Cash and due from banks				13,739
Investment securities				62,410
Loans acquired, not covered by FDIC loss share				326,829
Allowance for loan losses				(6,008)
Foreclosed assets not covered by FDIC loss share				3,262
Premises and equipment				4,405
Bank owned life insurance				7,530
Deposits:
Non-interest bearing transaction accounts				63,259
Interest bearing transaction accounts and savings deposits				200,596
Time deposits				91,507
Total deposits				355,362
Fed funds purchased				11,100
Other borrowings				11,106
Accrued interest and other liabilities				1,528
Total liabilities assumed				379,096
Equity				41,696
Total liabilities and equity assumed				420,792
Goodwill				822
Other intangibles				137
Deferred tax asset				1,859
Other assets				5,807
Total assets acquired				420,792
Cost Acquired [Member] | Metropolitan [Member]
Assets Acquired
Cash and due from banks	12,026
Interest bearing balances due from banks	77,059
Investment securities	235,160
Loans acquired, not covered by FDIC loss share	494,839
Allowance for loan losses	(19,025)
Foreclosed assets not covered by FDIC loss share	64,397
Premises and equipment	74,753
Deposits:
Non-interest bearing transaction accounts	150,259
Interest bearing transaction accounts and savings deposits	341,410
Time deposits	345,326
Total deposits	836,995
Fed funds purchased and other borrowings	36,637
Accrued interest and other liabilities	9,443
Total liabilities assumed	883,075
Equity	61,780
Total liabilities and equity assumed	944,855
Other assets	5,646
Total assets acquired	944,855
Cost Acquired [Member] | Truman [Member]
Assets Acquired
Cash and due from banks		22,467
Cash received from FDIC		10,495
Federal funds sold		12,338
Investment securities		23,540
Loans acquired, covered by FDIC loss share		87,620
Loans acquired, not covered by FDIC loss share		89,360
Foreclosed assets covered by FDIC loss share		20,723
Foreclosed assets not covered by FDIC loss share		10,314
Premises and equipment		1,390
Deposits:
Non-interest bearing transaction accounts		22,275
Interest bearing transaction accounts and savings deposits		70,705
Time deposits		135,573
Total deposits		228,553
Fed funds purchased and other borrowings		21,456
Payable to FDIC		1,285
Accrued interest and other liabilities		403
Total liabilities assumed		251,697
Other assets		1,478
Total assets acquired		279,725
Cost Acquired [Member] | Excel [Member]
Assets Acquired
Cash and due from banks			18,622
Cash received from FDIC			13,845
Federal funds sold			104
Investment securities			8,583
Loans acquired, covered by FDIC loss share			111,807
Loans acquired, not covered by FDIC loss share			26,528
Foreclosed assets covered by FDIC loss share			6,671
Foreclosed assets not covered by FDIC loss share			8,265
Premises and equipment			2,582
Deposits:
Non-interest bearing transaction accounts			19,372
Interest bearing transaction accounts and savings deposits			55,082
Time deposits			94,138
Total deposits			168,592
FHLB borrowings			8,010
Accrued interest and other liabilities			426
Total liabilities assumed			177,028
Other assets			972
Total assets acquired			197,979
Fair Value Adjustments [Member] | Delta Trust [Member]
Assets Acquired
Investment securities				(37)
Loans acquired, not covered by FDIC loss share				(15,149)
Allowance for loan losses				6,008
Foreclosed assets not covered by FDIC loss share				(1,471)
Premises and equipment				(433)
Deposits:
Other borrowings				(129)
Total liabilities assumed				(129)
Equity				(41,696)
Total liabilities and equity assumed				(41,825)
Goodwill				(822)
Core deposit intangible				4,318
Other intangibles				5,003
Deferred tax asset				558
Other assets				(1,381)
Total assets acquired				(3,406)
Fair Value Adjustments [Member] | Metropolitan [Member]
Assets Acquired
Investment securities	(2,259)
Loans acquired, not covered by FDIC loss share	(37,467)
Allowance for loan losses	19,025
Foreclosed assets not covered by FDIC loss share	(21,455)
Premises and equipment	(22,575)
Core deposit premium	9,844
Deposits:
Time deposits	512
Total deposits	512
Accrued interest and other liabilities	77
Total liabilities assumed	589
Equity	(61,780)
Total liabilities and equity assumed	(61,191)
Goodwill	17,900
Deferred tax asset	30,699
Other assets	(1,327)
Total assets acquired	(25,515)
Fair Value Adjustments [Member] | Truman [Member]
Assets Acquired
Loans acquired, covered by FDIC loss share		(30,479)
Loans acquired, not covered by FDIC loss share		(15,965)
Foreclosed assets covered by FDIC loss share		(5,607)
Foreclosed assets not covered by FDIC loss share		(2,563)
FDIC indemnification asset		26,723
Core deposit premium		1,191
Deposits:
Accrued interest and other liabilities		357
Total liabilities assumed		357
Other assets		149
Total assets acquired		(26,551)
Fair Value Adjustments [Member] | Excel [Member]
Assets Acquired
Loans acquired, covered by FDIC loss share			(33,660)
Loans acquired, not covered by FDIC loss share			(5,376)
Foreclosed assets covered by FDIC loss share			(3,558)
Foreclosed assets not covered by FDIC loss share			(2,404)
FDIC indemnification asset			26,218
Core deposit premium			1,337
Deposits:
FHLB borrowings			183
FDIC true-up provision			328
Accrued interest and other liabilities			706
Total liabilities assumed			1,217
Total assets acquired			(17,443)
Delta Trust [Member]
Assets Acquired
Cash and due from banks				13,739
Investment securities				62,373
Loans acquired, not covered by FDIC loss share				311,680
Foreclosed assets not covered by FDIC loss share				1,791
Premises and equipment				3,972
Bank owned life insurance				7,530
Deposits:
Non-interest bearing transaction accounts				63,259
Interest bearing transaction accounts and savings deposits				200,596
Time deposits				91,507
Total deposits				355,362
Fed funds purchased				11,100
Other borrowings				10,977
Accrued interest and other liabilities				1,528
Total liabilities assumed				378,967
Total liabilities and equity assumed				378,967
Net assets acquired				38,419
Purchase price				67,441
Goodwill				29,022
Core deposit intangible				4,318
Other intangibles				5,140
Deferred tax asset				2,417
Other assets				4,426
Total assets acquired				417,386
Metropolitan [Member]
Assets Acquired
Cash and due from banks	12,026
Interest bearing balances due from banks	77,059
Investment securities	232,901
Loans acquired, not covered by FDIC loss share	457,372
Foreclosed assets not covered by FDIC loss share	42,942
Premises and equipment	52,178
Core deposit premium	9,844
Deposits:
Non-interest bearing transaction accounts	150,259
Interest bearing transaction accounts and savings deposits	341,410
Time deposits	345,838
Total deposits	837,507
Fed funds purchased and other borrowings	36,637
Accrued interest and other liabilities	9,520
Total liabilities assumed	883,664
Total liabilities and equity assumed	883,664
Net assets acquired	35,676
Purchase price	53,600
Goodwill	17,924
Deferred tax asset	30,699					34,000		34,000
Other assets	4,319
Total assets acquired	919,340
Truman [Member]
Assets Acquired
Cash and due from banks		22,467
Cash received from FDIC		10,495
Federal funds sold		12,338
Investment securities		23,540
Loans acquired, covered by FDIC loss share		57,141
Loans acquired, not covered by FDIC loss share		73,395
Foreclosed assets covered by FDIC loss share		15,116
Foreclosed assets not covered by FDIC loss share		7,751
FDIC indemnification asset		26,723
Premises and equipment		1,390
Core deposit premium		1,191
Deposits:
Non-interest bearing transaction accounts		22,275
Interest bearing transaction accounts and savings deposits		70,705
Time deposits		135,573
Total deposits		228,553
Fed funds purchased and other borrowings		21,456
Payable to FDIC		1,285
Accrued interest and other liabilities		760
Total liabilities assumed		252,054
Pre-tax gain on FDIC-assisted transaction					1,120
Other assets		1,627
Total assets acquired		253,174
Excel [Member]
Assets Acquired
Cash and due from banks			18,622
Cash received from FDIC			13,845
Federal funds sold			104
Investment securities			8,583
Loans acquired, covered by FDIC loss share			78,147
Loans acquired, not covered by FDIC loss share			21,152
Foreclosed assets covered by FDIC loss share			3,113
Foreclosed assets not covered by FDIC loss share			5,861
FDIC indemnification asset			26,218
Premises and equipment			2,582
Core deposit premium			1,337
Deposits:
Non-interest bearing transaction accounts			19,372
Interest bearing transaction accounts and savings deposits			55,082
Time deposits			94,138
Total deposits			168,592
FHLB borrowings			8,193
FDIC true-up provision			328
Accrued interest and other liabilities			1,132
Total liabilities assumed			178,245
Pre-tax gain on FDIC-assisted transaction			2,291
Other assets			972
Total assets acquired			$ 180,536