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Bank segment - Loans receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, gross | $ 5,325,770 | $ 5,345,226 |  |
Deferred fees and discounts | (15,689) | (11,383) |  |
Allowance for credit losses | (91,793) | (101,201) | $ (77,084) | $ (53,355)
Total loans, net | 5,218,288 | 5,232,642 |  |
Real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, gross | 4,167,255 | 4,239,745 |  |
Real estate | Residential 1-4 family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, gross | 2,107,537 | 2,144,239 |  |
Allowance for credit losses | (5,261) | (4,600) | (4,476) | (2,380)
Real estate | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, gross | 1,012,968 | 983,865 |  |
Allowance for credit losses | (34,345) | (35,607) | (16,587) | (15,053)
Real estate | Home equity line of credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, gross | 901,462 | 963,578 |  |
Allowance for credit losses | (5,901) | (6,813) | (6,225) | (6,922)
Real estate | Residential land |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, gross | 17,468 | 15,617 |  |
Allowance for credit losses | (573) | (609) | (352) | (449)
Real estate | Commercial construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, gross | 114,455 | 121,424 |  |
Allowance for credit losses | (1,453) | (4,149) | (3,446) | (2,097)
Real estate | Residential construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, gross | 13,365 | 11,022 |  |
Allowance for credit losses | (16) | (11) | (14) | (3)
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, gross | 1,010,004 | 936,748 |  |
Allowance for credit losses | (24,504) | (25,462) | (12,977) | (10,245)
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, gross | 148,511 | 168,733 |  |
Allowance for credit losses | $ (19,740) | $ (23,950) | $ (33,007) | $ (16,206)

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