Income Taxes (Tables)

3 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of reconciliation of expected income tax expense (benefit) at the federal statutory rate to the Company’s provision for income taxes and effective tax rate

A reconciliation of expected income tax expense at the federal statutory income tax rate and the amounts recorded in the Consolidated Financial Statements were as follows:

	Three Months Ended March 31,
	2017					2016
(Dollars in thousands)	Amount			Rate		Amount			Rate
Tax at statutory rate	$	20,951		35.0	%	$	11,677		35.0	%
Changes resulting from:
Tax-exempt interest income	(1,757		)	(2.9	)	(1,139		)	(3.4	)
State taxes, net of federal benefit	212			0.4		—			—
Change in valuation allowance	11			—		—			—
Bank-owned life insurance adjustments	(344		)	(0.6	)	(68		)	(0.2	)
Income tax credits, net	(695		)	(1.2	)	(797		)	(2.4	)
Tax benefits in excess of compensation costs on share-based payments	(6,134		)	(10.2	)	(343		)	(1.0	)
Other, net	13			—		427			1.2
Income tax expense	$	12,257		20.5	%	$	9,757		29.2	%