Fair Value of Assets and Liabilities - Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases held for investment, net		$ 0
Loans held for sale at fair value	$ 180,061	121,902
Other assets	10,040
Total assets	952,219	1,007,115
Other liabilities	21,324	12,270
Total liabilities	523,579	801,852
Level 1 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale at fair value	0	0
Other assets	0
Total assets	0	0
Other liabilities	0	0
Total liabilities	0	0
Level 2 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale at fair value	0	0
Other assets	4,048
Total assets	235,635	75,572
Other liabilities	0	0
Total liabilities	0	0
Level 3 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale at fair value	180,061	121,902
Other assets	5,992
Total assets	716,584	931,543
Other liabilities	21,324	12,270
Total liabilities	523,579	801,852
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases held for investment, net	2,299,045
Loans held for sale at fair value	46,267
Other assets	12,495	914
Cash and cash equivalents		524,963
Restricted cash		103,522
Total assets	2,357,807	629,399
Deposits	63,236
Short-term borrowings	68,781	104,989
Advances from PPPLF	195,481
Other long-term debt	15,650
Other liabilities	50,056	57,536
Total liabilities	393,204	162,525
Balance at Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases held for investment, net	2,396,529
Loans held for sale at fair value	46,961
Other assets	13,258	914
Cash and cash equivalents		524,963
Restricted cash		103,522
Total assets	2,456,748	629,399
Deposits	63,236
Short-term borrowings	68,781	104,989
Advances from PPPLF	195,481
Other long-term debt	15,650
Other liabilities	50,056	57,536
Total liabilities	393,204	162,525
Balance at Fair Value | Level 1 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases held for investment, net	0
Loans held for sale at fair value	0
Other assets	0	0
Cash and cash equivalents		0
Restricted cash		0
Total assets	0	0
Deposits	0
Short-term borrowings	0	0
Advances from PPPLF	0
Other long-term debt	0
Other liabilities	0	0
Total liabilities	0	0
Balance at Fair Value | Level 2 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases held for investment, net	0
Loans held for sale at fair value	0
Other assets	10,220	914
Cash and cash equivalents		524,963
Restricted cash		103,522
Total assets	10,220	629,399
Deposits	0
Short-term borrowings	37,554	65,121
Advances from PPPLF	0
Other long-term debt	0
Other liabilities	30,475	43,984
Total liabilities	68,029	109,105
Balance at Fair Value | Level 3 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases held for investment, net	2,396,529
Loans held for sale at fair value	46,961
Other assets	3,038	0
Cash and cash equivalents		0
Restricted cash		0
Total assets	2,446,528	0
Deposits	63,236
Short-term borrowings	31,227	39,868
Advances from PPPLF	195,481
Other long-term debt	15,650
Other liabilities	19,581	13,552
Total liabilities	$ 325,175	$ 53,420