Bank segment - Credit Risk Profile - Payment Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Credit risk profile based on payment activity for loans
Total financing receivables	$ 6,064,848	$ 6,210,578
Amortized cost> 90 days and accruing	0	425
Real estate | Residential 1-4 family
Credit risk profile based on payment activity for loans
Total financing receivables	2,608,281	2,595,162
Amortized cost> 90 days and accruing	0	425
Real estate | Commercial real estate
Credit risk profile based on payment activity for loans
Total financing receivables	1,366,214	1,374,038
Amortized cost> 90 days and accruing	0	0
Real estate | Home equity line of credit
Credit risk profile based on payment activity for loans
Total financing receivables	959,607	1,017,207
Amortized cost> 90 days and accruing	0	0
Real estate | Residential land
Credit risk profile based on payment activity for loans
Total financing receivables	19,900	18,364
Amortized cost> 90 days and accruing	0	0
Real estate | Commercial construction
Credit risk profile based on payment activity for loans
Total financing receivables	208,867	172,405
Amortized cost> 90 days and accruing	0	0
Real estate | Residential construction
Credit risk profile based on payment activity for loans
Total financing receivables	16,998	17,843
Amortized cost> 90 days and accruing	0	0
Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	645,571	743,303
Amortized cost> 90 days and accruing	0	0
Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	239,410	272,256
Amortized cost> 90 days and accruing	0	0
30-59 days past due
Credit risk profile based on payment activity for loans
Total financing receivables	6,559	8,712
30-59 days past due | Real estate | Residential 1-4 family
Credit risk profile based on payment activity for loans
Total financing receivables	2,138	4,501
30-59 days past due | Real estate | Commercial real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
30-59 days past due | Real estate | Home equity line of credit
Credit risk profile based on payment activity for loans
Total financing receivables	1,388	1,481
30-59 days past due | Real estate | Residential land
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
30-59 days past due | Real estate | Commercial construction
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
30-59 days past due | Real estate | Residential construction
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
30-59 days past due | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	309	163
30-59 days past due | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	2,724	2,567
60-89 days past due
Credit risk profile based on payment activity for loans
Total financing receivables	3,606	8,148
60-89 days past due | Real estate | Residential 1-4 family
Credit risk profile based on payment activity for loans
Total financing receivables	891	5,165
60-89 days past due | Real estate | Commercial real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
60-89 days past due | Real estate | Home equity line of credit
Credit risk profile based on payment activity for loans
Total financing receivables	1,073	597
60-89 days past due | Real estate | Residential land
Credit risk profile based on payment activity for loans
Total financing receivables	0	675
60-89 days past due | Real estate | Commercial construction
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
60-89 days past due | Real estate | Residential construction
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
60-89 days past due | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	9	135
60-89 days past due | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	1,633	1,576
90 days or more past due
Credit risk profile based on payment activity for loans
Total financing receivables	18,262	23,073
90 days or more past due | Real estate | Residential 1-4 family
Credit risk profile based on payment activity for loans
Total financing receivables	5,278	8,670
90 days or more past due | Real estate | Commercial real estate
Credit risk profile based on payment activity for loans
Total financing receivables	10,698	11,048
90 days or more past due | Real estate | Home equity line of credit
Credit risk profile based on payment activity for loans
Total financing receivables	836	1,522
90 days or more past due | Real estate | Residential land
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
90 days or more past due | Real estate | Commercial construction
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
90 days or more past due | Real estate | Residential construction
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
90 days or more past due | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	74	244
90 days or more past due | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	1,376	1,589
Total past due
Credit risk profile based on payment activity for loans
Total financing receivables	28,427	39,933
Total past due | Real estate | Residential 1-4 family
Credit risk profile based on payment activity for loans
Total financing receivables	8,307	18,336
Total past due | Real estate | Commercial real estate
Credit risk profile based on payment activity for loans
Total financing receivables	10,698	11,048
Total past due | Real estate | Home equity line of credit
Credit risk profile based on payment activity for loans
Total financing receivables	3,297	3,600
Total past due | Real estate | Residential land
Credit risk profile based on payment activity for loans
Total financing receivables	0	675
Total past due | Real estate | Commercial construction
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
Total past due | Real estate | Residential construction
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
Total past due | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	392	542
Total past due | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	5,733	5,732
Current
Credit risk profile based on payment activity for loans
Total financing receivables	6,036,421	6,170,645
Current | Real estate | Residential 1-4 family
Credit risk profile based on payment activity for loans
Total financing receivables	2,599,974	2,576,826
Current | Real estate | Commercial real estate
Credit risk profile based on payment activity for loans
Total financing receivables	1,355,516	1,362,990
Current | Real estate | Home equity line of credit
Credit risk profile based on payment activity for loans
Total financing receivables	956,310	1,013,607
Current | Real estate | Residential land
Credit risk profile based on payment activity for loans
Total financing receivables	19,900	17,689
Current | Real estate | Commercial construction
Credit risk profile based on payment activity for loans
Total financing receivables	208,867	172,405
Current | Real estate | Residential construction
Credit risk profile based on payment activity for loans
Total financing receivables	16,998	17,843
Current | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	645,179	742,761
Current | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	$ 233,677	$ 266,524