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Mortgage Servicing Rights (Tables)
9 Months Ended
Sep. 30, 2021
Transfers and Servicing [Abstract]  
Summary of Changes in Mortgage Servicing Rights
The following table summarizes the changes in MSRs, which are included in other assets on the consolidated balance sheets:
Three months ended September 30Nine months ended September 30
 2021202020212020
 (in thousands)
Amortized cost:
Balance at beginning of period$36,062 $38,692 $38,745 $39,267 
Originations of MSRs2,637 4,319 6,905 8,569 
Amortization(2,661)(4,129)(9,612)(8,954)
Balance at end of period$36,038 $38,882 $36,038 $38,882 
Valuation allowance:
Balance at beginning of period$(6,600)$(7,700)$(10,500)$— 
Reduction (addition) to valuation allowance3,500 (1,500)7,400 (9,200)
Balance at end of period$(3,100)$(9,200)$(3,100)$(9,200)
Net MSRs at end of period$32,938 $29,682 $32,938 $29,682