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Deposits (Tables)
 12 Months Ended
Dec. 31, 2018
Banking and Thrift [Abstract]  
Scheduled maturities for time deposits
At December 31, 2018, the scheduled maturities for time deposits were as follows:
 
December 31, 2018
 
(Dollars in thousands)
Scheduled maturities in:
 
2019
$
5,183,279

2020
635,279

2021
31,059

2022
1,828

2023 and thereafter
19,179

Total
$
5,870,624

The following table presents the maturity schedules of time deposits in amounts of more than $250 thousand as of December 31, 2018:
 
More than $250,000
 
(Dollars in thousands)
Three months or less
$
571,535

Over three months through six months
332,352

Over six months through twelve months
774,224

Over twelve months
95,319

Total
$
1,773,430
Summary of interest expense on deposits
Interest expense on deposits for the periods indicated is summarized as follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(Dollars in thousands)
Money market and NOW
$
43,252

 
$
31,856

 
$
21,136

Savings deposits
1,889

 
1,354

 
1,282

Time deposits
89,817

 
41,692

 
25,673

Total deposit interest expense
$
134,958

 
$
74,902

 
$
48,091