Premises and equipment - Premises and Equipment and Related Accumulated Depreciation (Details) - USD ($)
$ in Thousands |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Property, Plant and Equipment [Line Items] |
|
|
| Finance lease |
$ 1,588
|
$ 0
|
| Premises and equipment and finance lease, gross |
206,881
|
144,761
|
| Less: accumulated depreciation and amortization |
(61,766)
|
(54,630)
|
| Total Premises and Equipment |
145,115
|
90,131
|
| Land |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Premises and equipment, gross |
33,151
|
26,283
|
| Premises |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Premises and equipment, gross |
108,579
|
65,569
|
| Furniture and fixtures |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Premises and equipment, gross |
26,729
|
23,545
|
| Leasehold improvements |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Premises and equipment, gross |
18,429
|
12,989
|
| Equipment |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Premises and equipment, gross |
16,904
|
15,575
|
| Construction in process |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Premises and equipment, gross |
$ 1,501
|
$ 800
|