Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Amount
Tax at statutory rate	$ 20,951	$ 11,677
Changes resulting from:
Tax-exempt interest income	1,757	1,139
State taxes, net of federal benefit	212	0
Change in valuation allowance	11	0
Bank-owned life insurance adjustments	344	68
Income tax credits, net	695	797
Tax benefits in excess of compensation costs on share-based payments	(6,134)	(343)
Other, net	13	427
Income tax provision (benefit)	$ 12,257	$ 9,757
Rate
Tax at statutory rate	35.00%	35.00%
Changes resulting from:
Tax-exempt interest income	(2.90%)	(3.40%)
State taxes, net of federal benefit	0.40%	0.00%
Change in valuation allowance	0.00%	0.00%
Bank-owned life insurance adjustments	(0.60%)	(0.20%)
Income tax credits, net	(1.20%)	(2.40%)
Tax benefits in excess of compensation costs on share-based payments	(10.20%)	(1.00%)
Other, net	0.00%	1.20%
Effective federal income tax rate	20.50%	29.20%

Effective Income Tax Rate Reconciliation, Tax Exempt Income, Life Insurance Proceeds, Amount

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