Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis by Significant Unobservable Inputs (Details) - Fair Value, Measurements, Nonrecurring	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value on a nonrecurring basis	$ 0	$ 0
Level 3
ASSETS
Total Assets	27,900,000	43,062,000
Collateral Method | Level 3
ASSETS
Loans held for investment	20,926,000
Impaired loans		38,697,000
Other real estate owned	3,045,000	3,231,000
Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights	$ 3,929,000	$ 1,134,000
Costs to sell | Collateral Method | Level 3
ASSETS
Other real estate owned, measurement input	0.07	0.07
Contractual loan rate | Discounted cash flow method | Level 3
ASSETS
Loans held for investment, measurement input	0.0325
Minimum | Costs to sell | Collateral Method | Level 3
ASSETS
Loans held for investment, measurement input	0.00
Impaired loans, measurement input		0.00
Minimum | Contractual loan rate | Discounted cash flow method | Level 3
ASSETS
Impaired loans, measurement input		0.0475
Minimum | Discount rate | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.0939	0.0939
Minimum | Constant prepayment rates | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.0746	0.0746
Maximum | Costs to sell | Collateral Method | Level 3
ASSETS
Loans held for investment, measurement input	0.17
Impaired loans, measurement input		0.20
Maximum | Contractual loan rate | Discounted cash flow method | Level 3
ASSETS
Impaired loans, measurement input		0.0550
Maximum | Discount rate | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.1254	0.1254
Maximum | Constant prepayment rates | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.1274	0.1274