Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2012

Defined Benefit Plan Disclosure [Line Items]

Components of net periodic benefit cost

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended March 31,
	2012			2011			2012			2011
	(In thousands)
Service cost	$	1,703		$	1,172		$	48		$	34
Interest cost		1,484			1,363			209			153
Expected return on plan assets		(2,048	)		(1,372	)		—			—
Amortization of prior service cost		—			—			(14	)		(14	)
Amortization of net loss		1,220			586			177			135
Amortization of transition obligation		—			—			1			1
Net periodic benefit cost	$	2,359		$	1,749		$	421		$	309

Whitney Sponsored Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Components of net periodic benefit cost

	Pension Benefits					Other Postretirement Benefits
	Qualified			Nonqualified
	(In thousands)
Service cost	$	1,532		$	12	$	—
Interest cost		2,646			172		152
Expected return on plan assets		(4,249	)				—
Amortization of prior service cost		—					—
Amortization of net loss		—					—
Amortization of transition obligation		411			14		—
Net periodic benefit cost	$	340		$	198	$	152