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Affordable Housing Projects Tax Credit Partnerships (Tables)
 12 Months Ended
Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of expected payments for unfunded affordable housing commitments

As of December 31, 2017, the expected payments for unfunded affordable housing commitments were as follows:

 

Years ending December 31:      
(dollars in thousands)   Amount  
2018   $ 4,044  
2019   5,736  
2020   2,208  
2021   226  
2022   147  
Thereafter   800  
Total unfunded commitments   $ 13,161