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Deposits
12 Months Ended
Dec. 31, 2018
Banking and Thrift [Abstract]  
Deposits
13.    
DEPOSITS
The composition of deposits is summarized for the periods presented in the table below.
 
 
 
As of December 31,
 
 
 
2018
 
 
2017
 
 
 
Amount
 
 
Percent
 
 
Amount
 
 
Percent
 
 
 
(Dollars in thousands)
 
Noninterest-bearing deposits
 
$
5,204,787
 
 
 
58.96
%
 
$
3,846,436
 
 
 
58.75
%
Interest-bearing deposits:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Investment checking
 
 
460,972
 
 
 
5.22
%
 
 
433,971
 
 
 
6.63
%
Money market
 
 
2,236,018
 
 
 
25.33
%
 
 
1,517,050
 
 
 
23.17
%
Savings
 
 
393,769
 
 
 
4.46
%
 
 
364,049
 
 
 
5.56
%
Time deposits
 
 
531,944
 
 
 
6.03
%
 
 
385,347
 
 
 
5.89
%
Total deposits
 
$
8,827,490
 
 
 
100.00
%
 
$
6,546,853
 
 
 
100.00
%
Time deposits with balances of $250,000 or more amounted to approximately $125.4 million and $
108.5 million at December 31, 2018 and 2017, respectively. Interest expense on such deposits amounted to approximately $1.1 million, $545,000 and $444,000, for the years ended December 31, 2018, 2017 and 2016, respectively.
At December 
31
,
2018
, the scheduled maturities of time certificates of deposit are as follows.
 
 
 
December 31, 2018
 
Year of maturity:
 
(Dollars in thousands)
 
2019
 
$
398,735
 
2020
 
 
70,898
 
2021
 
 
46,710
 
2022
 
 
5,320
 
2023 and thereafter
 
 
10,281
 
Total
 
$
531,944