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Bank segment - Credit risk profile - payment activity and assigned grades (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Credit risk profile by internally assigned grade for loans
Current Year	$ 956,609	$ 1,339,586
One Year before Current Year	965,198	590,363
Two Years before Current Year	427,762	382,648
Three Years before Current Year	269,681	335,784
Four Years before Current Year	251,518	368,904
Prior	1,221,251	1,172,236
Revolving	978,579	1,093,287
Converted to term loans	62,986	62,418
Total	5,133,584	5,345,226
Real estate
Credit risk profile by internally assigned grade for loans
Total	4,252,590	4,239,745
Real estate | Residential 1-4 family
Credit risk profile by internally assigned grade for loans
Current Year	541,140	567,282
One Year before Current Year	472,035	219,464
Two Years before Current Year	154,653	111,243
Three Years before Current Year	76,251	204,269
Four Years before Current Year	142,235	184,888
Prior	785,759	857,093
Revolving	0	0
Converted to term loans	0	0
Total	2,172,073	2,144,239
Real estate | Home equity line of credit
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	810,828	929,388
Converted to term loans	40,588	34,190
Total	851,416	963,578
Real estate | Residential land
Credit risk profile by internally assigned grade for loans
Current Year	8,905	8,357
One Year before Current Year	7,341	3,427
Two Years before Current Year	1,659	1,598
Three Years before Current Year	647	939
Four Years before Current Year	268	22
Prior	579	1,274
Revolving	0	0
Converted to term loans	0	0
Total	19,399	15,617
Real estate | Residential construction
Credit risk profile by internally assigned grade for loans
Current Year	4,664	6,919
One Year before Current Year	4,238	3,093
Two Years before Current Year	0	385
Three Years before Current Year	0	625
Four Years before Current Year	268	0
Prior	0	0
Revolving	0	0
Converted to term loans	0	0
Total	9,170	11,022
Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Current Year	144,337	280,864
One Year before Current Year	283,178	114,426
Two Years before Current Year	111,545	124,301
Three Years before Current Year	108,493	64,087
Four Years before Current Year	80,689	127,799
Prior	351,286	261,388
Revolving	11,288	11,000
Converted to term loans	0	0
Total	1,090,816	983,865
Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Current Year	11,225	16,390
One Year before Current Year	39,137	31,965
Two Years before Current Year	25,913	26,990
Three Years before Current Year	11,342	18,000
Four Years before Current Year	0	5,562
Prior	0	0
Revolving	22,099	22,517
Converted to term loans	0	0
Total	109,716	121,424
Consumer
Credit risk profile by internally assigned grade for loans
Current Year	27,318	29,546
One Year before Current Year	19,012	69,325
Two Years before Current Year	39,833	38,635
Three Years before Current Year	17,016	7,646
Four Years before Current Year	1,015	307
Prior	283	348
Revolving	14,081	18,848
Converted to term loans	4,098	4,078
Total	122,656	168,733
Commercial
Credit risk profile by internally assigned grade for loans
Current Year	219,020	430,228
One Year before Current Year	140,257	148,663
Two Years before Current Year	94,159	79,496
Three Years before Current Year	55,932	40,218
Four Years before Current Year	27,043	50,326
Prior	83,344	52,133
Revolving	120,283	111,534
Converted to term loans	18,300	24,150
Total	758,338	936,748
Pass | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Current Year	142,977	270,603
One Year before Current Year	278,941	63,301
Two Years before Current Year	62,907	62,168
Three Years before Current Year	60,174	28,432
Four Years before Current Year	55,824	55,089
Prior	257,110	155,654
Revolving	11,288	11,000
Converted to term loans	0	0
Total	869,221	646,247
Pass | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Current Year	11,225	14,480
One Year before Current Year	39,137	31,965
Two Years before Current Year	25,913	26,990
Three Years before Current Year	11,342	0
Four Years before Current Year	0	5,562
Prior	0	0
Revolving	22,099	22,517
Converted to term loans	0	0
Total	109,716	101,514
Pass | Commercial
Credit risk profile by internally assigned grade for loans
Current Year	218,541	392,088
One Year before Current Year	112,545	117,791
Two Years before Current Year	78,076	75,533
Three Years before Current Year	53,829	29,211
Four Years before Current Year	19,043	12,520
Prior	60,661	35,770
Revolving	93,979	74,520
Converted to term loans	16,334	11,004
Total	653,008	748,437
Special Mention | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Current Year	1,360	10,261
One Year before Current Year	4,237	36,405
Two Years before Current Year	34,617	57,952
Three Years before Current Year	46,447	33,763
Four Years before Current Year	23,027	68,287
Prior	42,850	48,094
Revolving	0	0
Converted to term loans	0	0
Total	152,538	254,762
Special Mention | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Current Year	0	1,910
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	18,000
Four Years before Current Year	0	0
Prior	0	0
Revolving	0	0
Converted to term loans	0	0
Total	0	19,910
Special Mention | Commercial
Credit risk profile by internally assigned grade for loans
Current Year	52	37,836
One Year before Current Year	27,498	23,087
Two Years before Current Year	11,810	1,920
Three Years before Current Year	279	6,990
Four Years before Current Year	2,682	30,264
Prior	19,495	13,250
Revolving	20,459	31,362
Converted to term loans	21	11,218
Total	82,296	155,927
Substandard | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	14,720
Two Years before Current Year	14,021	4,181
Three Years before Current Year	1,872	1,892
Four Years before Current Year	1,838	4,423
Prior	51,326	57,640
Revolving	0	0
Converted to term loans	0	0
Total	69,057	82,856
Substandard | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	0	0
Converted to term loans	0	0
Total	0	0
Substandard | Commercial
Credit risk profile by internally assigned grade for loans
Current Year	427	304
One Year before Current Year	214	7,785
Two Years before Current Year	4,273	2,043
Three Years before Current Year	1,824	4,017
Four Years before Current Year	5,318	7,542
Prior	3,188	3,113
Revolving	5,845	5,265
Converted to term loans	1,945	1,928
Total	23,034	31,997
Doubtful | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	0	0
Converted to term loans	0	0
Total	0	0
Doubtful | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	0	0
Converted to term loans	0	0
Total	0	0
Doubtful | Commercial
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	0	387
Converted to term loans	0	0
Total	0	387
Current | Real estate | Residential 1-4 family
Credit risk profile by internally assigned grade for loans
Current Year	541,140	567,282
One Year before Current Year	471,759	218,988
Two Years before Current Year	150,704	111,243
Three Years before Current Year	75,827	203,916
Four Years before Current Year	142,235	184,888
Prior	778,048	849,788
Revolving	0	0
Converted to term loans	0	0
Total	2,159,713	2,136,105
Current | Real estate | Home equity line of credit
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	809,566	927,106
Converted to term loans	39,932	33,228
Total	849,498	960,334
Current | Real estate | Residential land
Credit risk profile by internally assigned grade for loans
Current Year	8,905	8,357
One Year before Current Year	7,341	3,427
Two Years before Current Year	1,659	1,598
Three Years before Current Year	647	939
Four Years before Current Year	268	22
Prior	182	272
Revolving	0	0
Converted to term loans	0	0
Total	19,002	14,615
Current | Real estate | Residential construction
Credit risk profile by internally assigned grade for loans
Current Year	4,664	6,919
One Year before Current Year	4,238	3,093
Two Years before Current Year	0	385
Three Years before Current Year	0	625
Four Years before Current Year	268	0
Prior	0	0
Revolving	0	0
Converted to term loans	0	0
Total	9,170	11,022
Current | Consumer
Credit risk profile by internally assigned grade for loans
Current Year	27,059	28,818
One Year before Current Year	18,662	67,159
Two Years before Current Year	38,546	37,072
Three Years before Current Year	16,378	7,207
Four Years before Current Year	907	293
Prior	283	348
Revolving	13,745	18,351
Converted to term loans	3,819	3,758
Total	119,399	163,006
30-59 days past due
Credit risk profile by internally assigned grade for loans
Total	4,940	7,394
30-59 days past due | Real estate | Residential 1-4 family
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	2,224	2,629
Revolving	0	0
Converted to term loans	0	0
Total	2,224	2,629
30-59 days past due | Real estate | Home equity line of credit
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	126	552
Converted to term loans	129	298
Total	255	850
30-59 days past due | Real estate | Residential land
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	97	702
Revolving	0	0
Converted to term loans	0	0
Total	97	702
30-59 days past due | Real estate | Residential construction
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	0	0
Converted to term loans	0	0
Total	0	0
30-59 days past due | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Total	0	0
30-59 days past due | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Total	0	0
30-59 days past due | Consumer
Credit risk profile by internally assigned grade for loans
Current Year	206	406
One Year before Current Year	152	1,085
Two Years before Current Year	523	727
Three Years before Current Year	282	155
Four Years before Current Year	21	4
Prior	0	0
Revolving	126	138
Converted to term loans	117	90
Total	1,427	2,605
30-59 days past due | Commercial
Credit risk profile by internally assigned grade for loans
Total	937	608
60-89 days past due
Credit risk profile by internally assigned grade for loans
Total	2,640	5,411
60-89 days past due | Real estate | Residential 1-4 family
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	276	476
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	1,308	2,314
Revolving	0	0
Converted to term loans	0	0
Total	1,584	2,790
60-89 days past due | Real estate | Home equity line of credit
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	107	267
Converted to term loans	101	75
Total	208	342
60-89 days past due | Real estate | Residential land
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	0	0
Converted to term loans	0	0
Total	0	0
60-89 days past due | Real estate | Residential construction
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	0	0
Converted to term loans	0	0
Total	0	0
60-89 days past due | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Total	0	488
60-89 days past due | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Total	0	0
60-89 days past due | Consumer
Credit risk profile by internally assigned grade for loans
Current Year	24	191
One Year before Current Year	58	549
Two Years before Current Year	368	427
Three Years before Current Year	198	165
Four Years before Current Year	43	3
Prior	0	0
Revolving	61	97
Converted to term loans	28	59
Total	780	1,491
60-89 days past due | Commercial
Credit risk profile by internally assigned grade for loans
Total	68	300
Greater than 89 days past due
Credit risk profile by internally assigned grade for loans
Total	11,467	6,830
Greater than 89 days past due | Real estate | Residential 1-4 family
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	3,949	0
Three Years before Current Year	424	353
Four Years before Current Year	0	0
Prior	4,179	2,362
Revolving	0	0
Converted to term loans	0	0
Total	8,552	2,715
Greater than 89 days past due | Real estate | Home equity line of credit
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	1,029	1,463
Converted to term loans	426	589
Total	1,455	2,052
Greater than 89 days past due | Real estate | Residential land
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	300	300
Revolving	0	0
Converted to term loans	0	0
Total	300	300
Greater than 89 days past due | Real estate | Residential construction
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year before Current Year	0	0
Two Years before Current Year	0	0
Three Years before Current Year	0	0
Four Years before Current Year	0	0
Prior	0	0
Revolving	0	0
Converted to term loans	0	0
Total	0	0
Greater than 89 days past due | Real estate | Commercial real estate
Credit risk profile by internally assigned grade for loans
Total	0	0
Greater than 89 days past due | Real estate | Commercial construction
Credit risk profile by internally assigned grade for loans
Total	0	0
Greater than 89 days past due | Consumer
Credit risk profile by internally assigned grade for loans
Current Year	29	131
One Year before Current Year	140	532
Two Years before Current Year	396	409
Three Years before Current Year	158	119
Four Years before Current Year	44	7
Prior	0	0
Revolving	149	262
Converted to term loans	134	171
Total	1,050	1,631
Greater than 89 days past due | Commercial
Credit risk profile by internally assigned grade for loans
Total	$ 110	$ 132

X

- Definition

Amount, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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