Investment securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Amortized cost |
|
|
| Due in one year or less |
$ 35,486
|
$ 1,148
|
| Due in one to five years |
24,278
|
11,553
|
| Due in five to ten years |
40,038
|
18,287
|
| Due in over ten years |
257,721
|
158,616
|
| Amortized cost, total |
357,523
|
189,604
|
| Amortized cost |
1,137,848
|
676,705
|
| Fair value |
|
|
| Due in one year or less |
35,662
|
1,152
|
| Due in one to five years |
24,684
|
11,676
|
| Due in five to ten years |
41,332
|
18,887
|
| Due in over ten years |
275,798
|
165,990
|
| Fair value, total |
377,476
|
197,705
|
| Total debt securities |
1,172,400
|
688,381
|
| Mortgage-backed securities - residential |
|
|
| Amortized cost |
|
|
| Mortgage-backed securities |
760,099
|
474,144
|
| Amortized cost |
760,099
|
474,144
|
| Fair value |
|
|
| Mortgage-backed securities |
773,336
|
477,312
|
| Total debt securities |
773,336
|
477,312
|
| Mortgage-backed securities - commercial |
|
|
| Amortized cost |
|
|
| Mortgage-backed securities |
20,226
|
12,957
|
| Amortized cost |
20,226
|
12,957
|
| Fair value |
|
|
| Mortgage-backed securities |
21,588
|
13,364
|
| Total debt securities |
$ 21,588
|
$ 13,364
|