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Deposit Accounts (Tables)
12 Months Ended
Dec. 31, 2017
Deposits [Abstract]  
Schedule of components of deposit accounts and weighted average interest rates
Deposit accounts and weighted average interest rates consisted of the following at December 31:
 
 
2017
 
Weighted
Average
Interest Rate
 
2016
 
Weighted
Average
Interest Rate
 
 
 (dollars in thousands)
Transaction accounts
 
 
 
 
 
 
 
 
Noninterest-bearing checking
 
$
2,226,848

 
%
 
$
1,185,768

 
%
Interest-bearing checking
 
365,193

 
0.13
%
 
182,893

 
0.11
%
Money market
 
2,181,571

 
0.48
%
 
1,100,787

 
0.34
%
Savings
 
227,436

 
0.13
%
 
101,574

 
0.14
%
Total transaction accounts
 
5,001,048

 
0.21
%
 
2,571,022

 
0.16
%
Certificates of deposit accounts
 
 

 
 

 
 

 
 

Less than 100,000
 
192,409

 
0.85
%
 
121,148

 
0.74
%
$100,000 through $250,000
 
369,748

 
1.01
%
 
153,103

 
0.82
%
Greater than $250,000
 
522,663

 
1.26
%
 
300,308

 
0.74
%
Total certificates of deposit accounts
 
1,084,820

 
1.10
%
 
574,559

 
0.76
%
Total deposits
 
$
6,085,868

 
0.33
%
 
$
3,145,581

 
0.27
%
Schedule of aggregate annual maturities of certificates of deposit accounts
The aggregate annual maturities of certificates of deposit accounts at December 31, 2017 are as follows:
 
2017
 
Balance
 
Weighted Average Interest Rate
 
(dollars in thousands)
Within 3 months
$
318,794

 
0.93
%
4 to 6 months
250,026

 
1.07
%
7 to 12 months
279,192

 
1.18
%
13 to 24 months
175,005

 
1.24
%
25 to 36 months
29,270

 
1.33
%
37 to 60 months
22,936

 
1.44
%
Over 60 months
9,597

 
1.13
%
Total
$
1,084,820

 
1.10
%
Schedule of interest expense on deposit accounts
Interest expense on deposit accounts for the years ended December 31 is summarized as follows:
 
2017
 
2016
 
2015
 
(dollars in thousands)
Checking accounts
$
365

 
$
200

 
$
165

Money market accounts
6,720

 
3,641

 
2,426

Savings
251

 
151

 
141

Certificates of deposit accounts
6,035

 
4,399

 
3,898

Total
$
13,371

 
$
8,391

 
$
6,630