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Interest-Bearing Deposits (Tables)
 12 Months Ended
Dec. 31, 2017
Deposits [Abstract]  
Components of Interest-Bearing Deposits
Components of interest-bearing deposits at December 31 were as follows:
 
2017
 
2016
 
(dollars in thousands)
Interest-bearing demand deposits
$
187,281

 
$
114,043

Savings deposits
3,361,840

 
2,972,747

Time deposits
614,813

 
591,832

Total interest-bearing deposits
$
4,163,934

 
$
3,678,622
Scheduled Maturities of Time Deposits
Included in time deposits at December 31, 2017, were certificates of deposit with the following scheduled maturities (dollars in thousands):
2018
$
376,181

2019
144,091

2020
43,463

2021
35,530

2022 and thereafter
15,548

Total
$
614,813