Note 22 - Parent Company Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 40,421	$ 37,115	[1]
Other assets	74,573	76,418	[1]
Total assets	2,244,374	2,388,460	[1]
Liabilities
Total liabilities	1,911,517	2,037,746	[1]
Stockholders' equity
Preferred stock			[1]
Common stock	16,007	21,382
Additional paid-in capital	122,486	228,750	[1]
Retained earnings	195,793	180,543	[1]
Treasury stock		(79,121)
Accumulated other comprehensive loss	(1,429)	(840)	[1]
Total stockholders' equity	332,857	350,714	[1]	$ 339,057	$ 343,017
Total liabilities and stockholders' equity	2,244,374	2,388,460	[1]
Parent Company [Member]
Assets
Cash and due from banks	13,726	19,216
Loans to affiliates	184	184
Investment in subsidiaries	311,736	322,595
Other assets	7,717	9,010
Total assets	333,363	351,005
Liabilities
Other liabilities	506	291
Total liabilities	506	291
Stockholders' equity
Preferred stock
Common stock	16,007	21,382
Additional paid-in capital	122,486	228,750
Retained earnings	195,793	180,543
Treasury stock		(79,121)
Accumulated other comprehensive loss	(1,429)	(840)
Total stockholders' equity	332,857	350,714
Total liabilities and stockholders' equity	$ 333,363	$ 351,005

[1] Derived from audited financial statements