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Bank segment - Loans receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 5,439,346 |  | $ 5,221,204 |  |  |
Less: Deferred fees and discounts | (12,351) |  | (10,090) |  |  |
Allowance for credit losses | (69,456) | $ (67,211) | (71,130) | $ (78,252) | $ (91,793) | $ (101,201)
Total loans, net | 5,357,539 |  | 5,139,984 |  |  |
Real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 4,630,231 |  | 4,313,934 |  |  |
Real estate | Residential 1-4 family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 2,310,041 |  | 2,299,212 |  |  |
Allowance for credit losses | (8,520) | (7,874) | (6,545) | (5,518) | (5,261) | (4,600)
Real estate | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,261,389 |  | 1,056,982 |  |  |
Allowance for credit losses | (20,900) | (20,176) | (24,696) | (28,708) | (34,345) | (35,607)
Real estate | Home equity line of credit |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 923,976 |  | 835,663 |  |  |
Allowance for credit losses | (6,096) | (5,650) | (5,657) | (5,335) | (5,901) | (6,813)
Real estate | Residential land |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 21,535 |  | 19,859 |  |  |
Allowance for credit losses | (677) | (697) | (646) | (618) | (573) | (609)
Real estate | Commercial construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 94,060 |  | 91,080 |  |  |
Allowance for credit losses | (2,634) | (2,340) | (2,186) | (1,629) | (1,453) | (4,149)
Real estate | Residential construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 19,230 |  | 11,138 |  |  |
Allowance for credit losses | (46) | (31) | (18) | (16) | (16) | (11)
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 660,478 |  | 793,304 |  |  |
Allowance for credit losses | (12,413) | (14,314) | (15,798) | (20,058) | (24,504) | (25,462)
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 148,637 |  | 113,966 |  |  |
Allowance for credit losses | $ (18,170) | $ (16,129) | $ (15,584) | $ (16,370) | $ (19,740) | $ (23,950)

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