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Note 1 - Summary of Significant Accounting Policies (Details Textual)					1 Months Ended	12 Months Ended
	Jan. 23, 2017 USD ($)	Dec. 14, 2016 USD ($)	Nov. 17, 2016 USD ($)	Sep. 15, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Number of Reportable Segments						1
FDIC Indemnification Asset, Cash Payments Received				$ 2,368,000	$ 2,368,000
Gain (Loss) on Contract Termination				$ (7,476,000)	$ (7,476,000)		$ (7,476,000)
Derivative Asset, Notional Amount						99,200,000	61,300,000
Assets						8,400,056,000	7,559,658,000
Loans and Leases Receivable, Net Amount						5,596,604,000	4,888,004,000
Deposits						$ 6,735,219,000	$ 6,086,096,000
Hardeman County Investment Company, Inc. [Member]
Number of Bank Branches						10
Assets						$ 477,000,000
Loans and Leases Receivable, Net Amount						255,000,000
Deposits						$ 395,000,000
Southwest Bancorp, Inc. [Member]
Number of Bank Branches						31
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets						$ 2,500,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share						1,900,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits						$ 1,900,000,000
First Texas BHC, Inc. [Member]
Number of Bank Branches						16
Assets						$ 2,100,000,000
Loans and Leases Receivable, Net Amount						1,800,000,000
Deposits						$ 1,700,000,000
Pending Acquisition, Hardeman County Investment Company, Inc. [Member]
Business Combination, Consideration Transferred			$ 72,200,000
Pending Acquisition, Southwest Bancorp, Inc. [Member]
Business Combination, Consideration Transferred		$ 564,400,000
Pending Acquisition, First Texas BHC, Inc. [Member] | Subsequent Event [Member]
Business Combination, Consideration Transferred	$ 462,000,000

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