Non-interest Revenue and Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total non-interest income	$ 1,643	$ 899	$ 1,973	$ 1,683	$ 824	$ 965	$ 1,009	$ 941	$ 6,198	$ 3,739
Noninterest income out of scope of Topic 606
Disaggregation of Revenue [Line Items]
Total non-interest income									1,994	230
Noninterest income in scope of Topic 606
Disaggregation of Revenue [Line Items]
Total non-interest income									4,204	3,509
Deposit Account | Noninterest income in scope of Topic 606
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer									2,637	3,147
Mortgage Banking | Noninterest income in scope of Topic 606
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer									288	307
Financial Service, Other | Noninterest income in scope of Topic 606
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer									$ 1,279	$ 55