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Loan Servicing (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |
Unpaid balance of loans serviced for others | $ 635,224 | $ 514,294 | $ 533,386
Federal Home Loan Mortgage Corporation |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |
Unpaid balance of loans serviced for others | 514,539 | 354,393 | 351,672
Fannie Mae |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |
Unpaid balance of loans serviced for others | 69,072 | 82,922 | 92,552
Federal Home Loan Bank |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |
Unpaid balance of loans serviced for others | 51,479 | 76,815 | 88,931
Chevy Chase Mortgage Company |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |
Unpaid balance of loans serviced for others | $ 134 | $ 164 | $ 231

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