Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Taxes [Abstract]

Income Tax Expense

	Years Ended December 31,
(in thousands)	2016		2015		2014
Included in net income
Current federal	$	43,777	$	17,378	$	41,441
Current state		1,689		4,241		1,487
Total current provision		45,466		21,619		42,928
Deferred federal		(6,127)		15,457		21,483
Deferred state		(1,712)		1,228		2,054
Total deferred provision		(7,839)		16,685		23,537
Total included in net income	$	37,627	$	38,304	$	66,465

Deferred Tax Assets and Liabilities

	December 31,
(in thousands)	2016		2015
Deferred tax assets:
Allowance for loan losses	$	89,120	$	72,940
Employee compensation and benefits		28,401		26,853
Loan purchase accounting adjustments		12,047		18,977
Tax credit carryforward		29,085		42,850
Securities		23,169		5,038
State net operating loss		1,690		1,910
Other		14,583		10,928
Gross deferred tax assets		198,095		179,496
State valuation allowance		(1,690)		(1,910)
Subtotal valuation allowance		(1,690)		(1,910)
Net deferred tax assets		196,405		177,586
Deferred tax liabilities:
Fixed assets & intangibles		(74,518)		(80,389)
FDIC indemnification asset		(6,293)		(10,688)
Other		(11,159)		(10,679)
Gross deferred tax liabilities		(91,970)		(101,756)
Net deferred tax asset	$	104,435	$	75,830

Effective Income Tax Rate Reconciliation

	Years Ended December 31,
	2016				2015				2014
($ in thousands)	Amount		%		Amount		%		Amount		%
Taxes computed at statutory rate	$	65,423	35.0	%	$	59,418	35.0	%	$	84,766	35.0	%
Increases (decreases) in taxes resulting from:
State income taxes, net of federal income
tax benefit		1,917	1.0			2,595	1.5			4,649	1.9
Tax-exempt interest		(14,497)	(7.8)			(7,849)	(4.6)			(6,301)	(2.6)
Bank owned life insurance		(4,833)	(2.6)			(3,798)	(2.2)			(3,554)	(1.5)
Tax credits		(10,518)	(5.6)			(12,495)	(7.4)			(16,577)	(6.8)
Other, net		135	0.1			433	0.3			3,482	1.4
Income tax expense	$	37,627	20.1	%	$	38,304	22.6	%	$	66,465	27.4	%