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Bank segment - Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 6,221,102 |  | $ 6,005,021 |  |  |
Less: Deferred fees and discounts | (30,096) |  | (26,115) |  |  |
Allowance for credit losses | (76,366) | $ (69,068) | (72,216) | $ (70,406) | $ (69,456) | $ (71,130)
Loans held for investment, net | 6,114,640 |  | 5,906,690 |  |  |
Real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 5,205,698 |  | 4,970,621 |  |  |
Real estate | Residential 1-4 family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 2,566,300 |  | 2,479,637 |  |  |
Allowance for credit losses | (6,467) | (4,708) | (6,270) | (7,584) | (8,520) | (6,545)
Real estate | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,400,570 |  | 1,358,123 |  |  |
Allowance for credit losses | (22,458) | (20,278) | (21,898) | (21,036) | (20,900) | (24,696)
Real estate | Home equity line of credit |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,032,749 |  | 1,002,905 |  |  |
Allowance for credit losses | (7,775) | (7,139) | (6,125) | (5,943) | (6,096) | (5,657)
Real estate | Residential land |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 20,245 |  | 20,679 |  |  |
Allowance for credit losses | (621) | (653) | (717) | (689) | (677) | (646)
Real estate | Commercial construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 168,539 |  | 88,489 |  |  |
Allowance for credit losses | (3,624) | (2,549) | (1,195) | (999) | (2,634) | (2,186)
Real estate | Residential construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 17,295 |  | 20,788 |  |  |
Allowance for credit losses | (42) | (26) | (46) | (49) | (46) | (18)
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 732,458 |  | 779,691 |  |  |
Allowance for credit losses | (10,783) | (11,358) | (12,426) | (12,951) | (12,413) | (15,798)
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 282,946 |  | 254,709 |  |  |
Allowance for credit losses | $ (24,596) | $ (22,357) | $ (23,539) | $ (21,155) | $ (18,170) | $ (15,584)

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