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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
(Dollars in thousands)
Amount
 
Rate
 
Amount
 
Rate
 
Amount
 
Rate
 
Amount
 
Rate
Tax at statutory rate
$
26,268

 
35.0
 %
 
$
12,707

 
35.0
 %
 
$
47,219

 
35.0
 %
 
$
24,384

 
35.0
 %
Changes resulting from:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Tax-exempt interest income
(1,832
)
 
(2.4
)
 
(1,139
)
 
(3.1
)
 
(3,589
)
 
(2.7
)
 
(2,278
)
 
(3.3
)
State taxes, net of federal benefit
258

 
0.3

 
—

 
—

 
470

 
0.4

 
—

 
—

Change in valuation allowance
38

 
—

 
—

 
—

 
49

 
—

 
—

 
—

Bank-owned life insurance adjustments
(335
)
 
(0.4
)
 
(287
)
 
(0.8
)
 
(679
)
 
(0.5
)
 
(355
)
 
(0.5
)
Income tax credits, net
(1,102
)
 
(1.5
)
 
(834
)
 
(2.3
)
 
(1,797
)
 
(1.3
)
 
(1,631
)
 
(2.3
)
Tax benefits in excess of compensation costs on share-based payments(1)
(248
)
 
(0.3
)
 
(68
)
 
(0.2
)
 
(6,382
)
 
(4.7
)
 
(411
)
 
(0.6
)
Other, net
(11
)
 
—

 
153

 
0.4

 
2

 
—

 
580

 
0.8

Income tax expense
$
23,036

 
30.7
 %
 
$
10,532

 
29.0
 %
 
$
35,293

 
26.2
 %
 
$
20,289

 
29.1
 %

(1) Represents excess tax benefits resulting from the exercise or settlement of share-based payment transactions.