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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Commitments
The Company leases its premises under non-cancelable operating leases, and at December 31, 2018, the future minimum rental commitments under these leases are as follows:
 
December 31, 2018
 
(Dollars in thousands)
2019
$
14,968

2020
13,008

2021
12,090

2022
7,964

2023
5,788

Thereafter
19,338

 
$
73,156

Commitments
Commitments at December 31, 2018 and 2017 are summarized as follows:
 
December 31,
 
2018
 
2017
 
(Dollars in thousands)
Commitments to Fund Low Income Housing Partnership Investments
$
46,507

 
$
38,467

Unused Credit Extensions
1,712,032

 
1,526,981

Standby Letters of Credit
69,763

 
74,748

Other Commercial Letters of Credit
65,822

 
74,147

 
$
1,894,124

 
$
1,714,343