Fair value of financial instruments - Differences between Fair Value and Principal Balance for Loans Held for Sale Measured at Fair Value (Details) - USD ($)
$ in Thousands |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Aggregate fair value |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Mortgage loans held for sale measured at fair value |
$ 683,770
|
$ 262,518
|
| Past due loans of 90 days or more |
83
|
0
|
| Nonaccrual loans |
6,406
|
0
|
| Aggregate fair value | Commercial |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Mortgage loans held for sale measured at fair value |
208,914
|
|
| Aggregate Unpaid Principal Balance |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Mortgage loans held for sale measured at fair value |
651,887
|
254,868
|
| Past due loans of 90 days or more |
163
|
0
|
| Nonaccrual loans |
12,033
|
0
|
| Aggregate Unpaid Principal Balance | Commercial |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Mortgage loans held for sale measured at fair value |
226,867
|
|
| Difference |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Mortgage loans held for sale measured at fair value |
31,883
|
7,650
|
| Past due loans of 90 days or more |
(80)
|
0
|
| Nonaccrual loans |
(5,627)
|
$ 0
|
| Difference | Commercial |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Mortgage loans held for sale measured at fair value |
$ (17,953)
|
|