Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Long-term Purchase Commitment [Line Items]
Term of commitments to lend	365 days
Unused lines of credit
Long-term Purchase Commitment [Line Items]
Loan commitments	$ 738,189	$ 790,366
Loan commitments, available without further approval	$ 273,300
Loan commitments, portion available without approval, percent	37.00%
Minimum
Long-term Purchase Commitment [Line Items]
Interest rate of loan commitments	0.00%
Maturity period of loan commitments	1 year
Maximum
Long-term Purchase Commitment [Line Items]
Interest rate of loan commitments	12.00%
Maturity period of loan commitments	25 years