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Goodwill and Other Intangibles and Mortgage Servicing Rights - Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Goodwill:    
Goodwill at beginning of year $ 151,198 $ 107,366
Acquisition 0 44,594
Impairment 0 (762)
Goodwill at end of period $ 151,198 $ 151,198