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Residential Mortgage Servicing Rights
 9 Months Ended
Sep. 30, 2020
Transfers and Servicing [Abstract]  
Residential Mortgage Servicing Rights Residential Mortgage Servicing Rights 
 
The Company measures its residential mortgage servicing rights ("MSR") at fair value with changes in fair value reported in residential mortgage banking revenue. The following table presents the changes in the Company's residential mortgage servicing rights for the three and nine months ended September 30, 2020 and 2019: 
Three Months EndedNine Months Ended
 (in thousands) September 30, 2020September 30, 2019September 30, 2020September 30, 2019
Balance, beginning of period$96,356 $139,780 $115,010 $169,025 
Additions for new MSR capitalized14,014 7,393 37,484 16,772 
Changes in fair value:    
Changes due to collection/realization of expected cash flows over time(4,878)(6,835)(15,249)(20,171)
Changes due to valuation inputs or assumptions (1)
(12,244)11,045 (43,997)(14,243)
Balance, end of period$93,248 $151,383 $93,248 $151,383 
(1) The changes in valuation inputs and assumptions principally reflect changes in discount rates and prepayment speeds, which are primarily affected by changes in interest rates.

Information related to the Bank's serviced loan portfolio as of September 30, 2020 and December 31, 2019 is as follows: 
(dollars in thousands)September 30, 2020December 31, 2019
Balance of loans serviced for others$12,964,361 $12,276,943 
MSR as a percentage of serviced loans0.72 %0.94 %
 
The amount of contractually specified servicing fees, late fees and ancillary fees earned, recorded in residential mortgage banking revenue on the Condensed Consolidated Statements of Income, was $8.8 million and $26.2 million for the three and nine months ended September 30, 2020, respectively, as compared to $11.3 million and $33.2 million for the three and nine months ended September 30, 2019, respectively.