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Mortgage Servicing Rights (Tables)
3 Months Ended
Mar. 31, 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 March 31
 20212020
 (in thousands)
Amortized cost:
Balance at beginning of period$38,745 $39,267 
Originations of MSRs2,811 1,478 
Amortization(3,753)(1,891)
Balance at end of period$37,803 $38,854 
Valuation allowance:
Balance at beginning of period$(10,500)$— 
Reduction (addition) to valuation allowance6,100 (1,100)
Balance at end of period$(4,400)$(1,100)
Net MSRs at end of period$33,403 $37,754