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Quarterly Financial Results (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Summary of Selected Consolidated Quarterly Financial Data
A summary of selected consolidated quarterly financial data for each of the years in the three-year period ended December 31, 2017 follows:
(in thousands, except per share data)
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2017
 
 
 
 
 
 
 
Interest income
$
102,143

 
$
123,743

 
$
202,167

 
$
208,085

Net interest income
88,767

 
106,627

 
173,182

 
174,731

Provision for loan losses
3,651

 
6,812

 
6,920

 
6,281

Net income before taxes
53,444

 
63,074

 
99,503

 
81,965

Net income
39,653

 
43,086

 
64,442

 
26,798

Basic net income per share
$
0.83

 
$
0.81

 
$
0.84

 
$
0.35

Diluted net income per share
$
0.82

 
$
0.80

 
$
0.83

 
$
0.35

 
 
 
 
 
 
 
 
2016
 

 
 

 
 

 
 

Interest income
$
80,974

 
$
83,762

 
$
97,380

 
$
101,493

Net interest income
73,902

 
75,044

 
86,635

 
89,413

Provision for loan losses
3,894

 
5,280

 
6,108

 
3,046

Net income before taxes
41,800

 
46,546

 
48,693

 
54,345

Net income
27,964

 
30,787

 
32,377

 
36,097

Basic net income per share
$
0.70

 
$
0.75

 
$
0.71

 
$
0.79

Diluted net income per share
$
0.68

 
$
0.73

 
$
0.71

 
$
0.78

 
 
 
 
 
 
 
 
2015
 

 
 

 
 

 
 

Interest income
$
54,679

 
$
55,503

 
$
67,192

 
$
77,797

Net interest income
51,269

 
51,831

 
62,059

 
71,475

Provision for loan losses
315

 
1,186

 
2,228

 
5,459

Net income before taxes
32,617

 
33,917

 
36,134

 
40,432

Net income
21,843

 
22,665

 
24,149

 
26,854

Basic net income per share
$
0.62

 
$
0.65

 
$
0.64

 
$
0.67

Diluted net income per share
$
0.62

 
$
0.64

 
$
0.62

 
$
0.65