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Deposits
12 Months Ended
Dec. 31, 2017
Banking and Thrift [Abstract]  
Deposits
Deposits
Deposits at December 31, 2017 and 2016 are summarized as follows (in thousands):
 
2017
 
Weighted
average
interest rate
 
2016
 
Weighted
average
interest rate
Savings deposits
$
1,083,012

 
0.17
%
 
$
1,099,020

 
0.17
%
Money market accounts
1,532,024

 
0.36

 
1,582,750

 
0.31

NOW accounts
2,011,334

 
0.46

 
1,871,298

 
0.33

Non-interest bearing deposits
1,452,987

 

 
1,349,378

 

Certificates of deposit
634,809

 
0.94

 
651,183

 
0.72

Total deposits
$
6,714,166

 
 
 
$
6,553,629

 
 

 Scheduled maturities of certificates of deposit accounts at December 31, 2017 and 2016 are as follows (in thousands):
 
2017
 
2016
Within one year
$
424,448

 
439,035

One to three years
150,280

 
134,941

Three to five years
56,529

 
75,751

Five years and thereafter
3,552

 
1,456

 
$
634,809

 
651,183


Interest expense on deposits for the years ended December 31, 2017, 2016 and 2015 is summarized as follows (in thousands):
 
Years ended December 31,
 
2017
 
2016
 
2015
Savings deposits
$
2,092

 
1,709

 
1,039

NOW and money market accounts
12,205

 
10,106

 
8,046

Certificates of deposits
5,144

 
5,132

 
5,436

 
$
19,441

 
16,947

 
14,521