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Mortgage Servicing Rights - Change in MSRs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in mortgage servicing rights    
Beginning balance $ 48,230 $ 39,339
Capitalization 13,823 13,905
Amortization (7,009) (5,014)
Valuation adjustment 1,836  
Ending balance $ 53,208 $ 48,230