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Affordable Housing Projects Tax Credit Partnerships (Tables)
 12 Months Ended
Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of expected payments for unfunded affordable housing commitments

As of December 31, 2018, the expected payments for unfunded affordable housing commitments were as follows:

 

Years ending December 31:    
(dollars in thousands)  Amount 
2019  $6,111 
2020   4,473 
2021   3,114 
2022   155 
2023   247 
Thereafter   889 
Total unfunded commitments  $14,989