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Bank segment - Loans Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 6,168,406 |  | $ 6,005,021 |  |  |
Less: Deferred fees and discounts | (30,224) |  | (26,115) |  |  |
Allowance for credit losses | (69,068) | $ (71,296) | (72,216) | $ (69,456) | $ (67,211) | $ (71,130)
Loans held for investment, net | 6,069,114 |  | 5,906,690 |  |  |
Real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 5,130,145 |  | 4,970,621 |  |  |
Real estate | Residential 1-4 family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 2,548,160 |  | 2,479,637 |  |  |
Allowance for credit losses | (4,708) | (4,612) | (6,270) | (8,520) | (7,874) | (6,545)
Real estate | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,382,376 |  | 1,358,123 |  |  |
Allowance for credit losses | (20,278) | (22,701) | (21,898) | (20,900) | (20,176) | (24,696)
Real estate | Home equity line of credit |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,035,099 |  | 1,002,905 |  |  |
Allowance for credit losses | (7,139) | (6,053) | (6,125) | (6,096) | (5,650) | (5,657)
Real estate | Residential land |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 21,226 |  | 20,679 |  |  |
Allowance for credit losses | (653) | (620) | (717) | (677) | (697) | (646)
Real estate | Commercial construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 128,748 |  | 88,489 |  |  |
Allowance for credit losses | (2,549) | (735) | (1,195) | (2,634) | (2,340) | (2,186)
Real estate | Residential construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 14,536 |  | 20,788 |  |  |
Allowance for credit losses | (26) | (28) | (46) | (46) | (31) | (18)
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 747,343 |  | 779,691 |  |  |
Allowance for credit losses | (11,358) | (11,936) | (12,426) | (12,413) | (14,314) | (15,798)
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 290,918 |  | 254,709 |  |  |
Allowance for credit losses | $ (22,357) | $ (24,611) | $ (23,539) | $ (18,170) | $ (16,129) | $ (15,584)

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