Note 10 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

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

	2014		2013			2012
	(In thousands)
Federal:
Current	$	18,052	$	17,808		$	17,330
Deferred		2,860		(464	)		(590	)
Total federal tax provision		20,912		17,344			16,740
State and Local:
Current		6,369		5,828			5,321
Deferred		1,292		(216	)		(214	)
Total state and local tax provision		7,661		5,612			5,107
Total income tax provision	$	28,573	$	22,956		$	21,847

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

	2014					2013					2012
	(Dollars in thousands)
Taxes at federal statutory rate	$	25,484		35.0	%	$	21,248		35.0	%	$	19,662		35.0	%
Increase (reduction) in taxes resulting from:
State and local income tax, net of Federal income tax benefit		4,980		6.8			3,648		6.0			3,320		5.9
Other		(1,891	)	(2.6	)		(1,940	)	(3.2	)		(1,135	)	(2.0	)
Taxes at effective rate	$	28,573		39.2	%	$	22,956		37.8	%	$	21,847		38.9	%

Schedule of Components of the Income Taxes Attributable to Income From Operations and Changes in Equity [Table Text Block]

	2014			2013			2012
	(In thousands)
Income from operations	$	28,573		$	22,956		$	21,847
Equity:
Change in fair value of securities available for sale		9,200			(21,309	)		5,577
Current year actuarial gains (losses) of postretirement plans		(2,880	)		2,527			(340	)
Amortization of net actuarial losses and prior service credits		(311	)		521			436
Compensation expense for tax purposes in (excess) or less than that recognized for financial reporting purposes		(846	)		(443	)		303
Total income taxes	$	33,736		$	4,252		$	27,823

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

	2014		2013
	(In thousands)
Deferred tax asset:
Postretirement benefits	$	5,407	$	4,880
Allowance for loan losses		11,007		13,895
Stock based compensation		2,821		2,322
Depreciation		1,740		1,400
Unrealized loss on securities available for sale		-		6,612
Fair value adjustment on financial assets carried at fair value		-		2,470
Derivative financial instruments		1,025		-
Other-than-temporary impairment charges		-		1,584
Adjustment required to recognize funded status of postretirement pension plans		4,787		2,218
Other		3,023		2,336
Deferred tax asset		29,810		37,717
Deferred tax liability:
Valuation differences resulting from acquired assets and liabilities		2,764		2,805
Fair value adjustment on financial assets carried at fair value		132		-
Fair value adjustment on financial liabilities carried at fair value		14,480		14,910
Unrealized gains on securities available for sale		2,588		-
Other		2,525		1,898
Deferred tax liability		22,489		19,613
Net deferred tax asset included in other assets	$	7,321	$	18,104