Note 11 - Federal Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	2017			2016			2015
Current expense	$	13,978,000		$	15,786,000		$	7,399,000
Deferred expense		(505,000	)		(699,000	)		4,592,000
Effect of federal tax law change		1,336,000			0			0
Change in valuation allowance		0			(113,000	)		(180,000	)
Tax expens e	$	14,809,000		$	14,974,000		$	11,811,000

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	201 7			201 6			201 5
Tax at statutory rate (35%)	$	16,129,000		$	16,410,000		$	13,591,000
Increase (decrease) from
Tax-exempt interest		(1,030,000	)		(876,000	)		(781,000	)
Bank owned life insurance		(948,000	)		(440,000	)		(384,000	)
Effect of federal tax law change		1,336,000			0			0
Change in valuation allowance		0			(113,000	)		(180,000	)
Other		(678,000	)		(7,000	)		(435,000	)
Tax expense	$	14,809,000		$	14,974,000		$	11,811,000

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	2017			2016
Deferred income tax assets
Allowance for loan losses	$	4,095,000		$	6,286,000
Deferred compensation		673,000			1,175,000
Stock compensation		501,000			786,000
Nonaccrual loan interest income		425,000			623,000
Deferred loan fees		211,000			496,000
Capital loss carryforward		94,000			157,000
Fair value write-downs on foreclosed properties		23,000			24,000
Fair value of interest rate swap		0			30,000
Unrealized loss on securities		1,303,000			2,976,000
Other		311,000			408,000
Deferred tax asset before valuation allowance		7,636,000			12,961,000
Valuation allowance		(94,000	)		(157,000	)
Deferred tax asset after valuation allowance		7,542,000			12,804,000
Deferred income tax liabilities
Depreciation		727,000			928,000
Prepaid expenses		244,000			463,000
Core deposit intangible		1,565,000			3,423,000
Mortgage loan servicing rights		1,072,000			1,940,000
Business combination adjustments		1,784,000			2,183,000
Other		146,000			199,000
Deferred tax liability		5,538,000			9,136,000
Total net deferred tax asset	$	2,004,000		$	3,668,000