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Securities Sold Under Agreements to Repurchase (Tables)
 3 Months Ended
Mar. 31, 2020
Transfers and Servicing [Abstract]  
Carrying Value of Repurchase Agreements The following tables summarize the carrying value of the Company’s repurchase agreements by remaining contractual maturity and category of collateral:
March 31, 2020
Remaining Contractual Maturity
of the Agreements
(Dollars in thousands)Overnight and ContinuousTotal
Residential mortgage-backed securities$328,722  328,722  
Commercial mortgage-backed securities251,613  251,613  
Total$580,335  580,335  

December 31, 2019
Remaining Contractual Maturity
of the Agreements
(Dollars in thousands)Overnight and ContinuousTotal
Residential mortgage-backed securities$312,015  312,015  
Commercial mortgage-backed securities257,809  257,809  
Total$569,824  569,824