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Commitments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
Heartland leases certain land and facilities under operating leases. Minimum future rental commitments at December 31, 2017 for all non-cancelable leases were as follows, in thousands:
2018
$
5,774

2019
5,626

2020
5,411

2021
5,034

2022
4,175

Thereafter
22,817

 
$
48,837