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Short-term borrowings (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Short-term Debt
The detail of short-term borrowings for the years 2019, 2018 and 2017 is presented in the following table:
(Dollars in thousands)
 
Federal Funds
Purchased
 
Securities Sold
Under Agreements
to Repurchase
 
Trading
Liabilities
 
Other
Short-term
Borrowings
2019
 
 
 
 
 
 
 
 
Average balance
 
$
737,715

 
$
701,164

 
$
503,302

 
$
538,249

Year-end balance
 
548,344

 
716,925

 
505,581

 
2,253,045

Maximum month-end outstanding
 
1,281,853

 
772,092

 
754,220

 
2,276,139

Average rate for the year
 
2.08
%
 
1.89
%
 
2.48
%
 
2.34
%
Average rate at year-end
 
1.55

 
1.72

 
2.07

 
2.14

2018
 
 
 
 
 
 
 
 
Average balance
 
$
405,110

 
$
713,841

 
$
682,943

 
$
1,046,585

Year-end balance
 
256,567

 
762,592

 
335,380

 
114,764

Maximum month-end outstanding
 
503,138

 
891,425

 
890,717

 
2,229,155

Average rate for the year
 
1.89
%
 
1.40
%
 
2.83
%
 
1.82
%
Average rate at year-end
 
2.50

 
1.66

 
3.21

 
2.48

2017
 
 
 
 
 
 
 
 
Average balance
 
$
447,137

 
$
578,666

 
$
685,891

 
$
554,502

Year-end balance
 
399,820

 
656,602

 
638,515

 
2,626,213

Maximum month-end outstanding
 
568,490

 
743,684

 
896,943

 
2,626,213

Average rate for the year
 
1.06
%
 
0.72
%
 
2.26
%
 
1.28
%
Average rate at year-end
 
1.48

 
0.64

 
2.22

 
1.44