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Allowance for Credit Losses - Portfolio Credit Quality (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Loan portfolio by credit quality indicator
2026	$ 2,696,241		$ 2,696,241
2025	2,647,152		2,647,152		$ 4,033,573
2024	1,426,802		1,426,802		1,617,530
2023	1,512,688		1,512,688		1,779,177
2022	793,446		793,446		940,183
2021/Prior	707,708		707,708		506,018
Prior					583,941
Total loans	9,784,037		9,784,037		9,460,422
Current-period gross writeoffs
Total	2,392	$ 2,025	7,087	$ 14,002
Domestic \| Commercial real estate: farmland & commercial \| Current Period Gross Write-Offs
Loan portfolio by credit quality indicator
2025	47		47
Total loans	47		47
Domestic \| Commercial real estate: multifamily \| Pass
Loan portfolio by credit quality indicator
2026	110,009		110,009
2025	155,882		155,882
2024	224,780		224,780
2023	468,644		468,644
2022	23,700		23,700
2021/Prior	37,686		37,686
Total loans	1,020,701		1,020,701
Commercial, financial and agricultural
Loan portfolio by credit quality indicator
Total loans	5,990,775		5,990,775		5,603,505
Commercial, financial and agricultural \| Domestic \| Commercial
Loan portfolio by credit quality indicator
2026	707,679		707,679
2025	470,205		470,205		968,293
2024	112,386		112,386		172,877
2023	258,719		258,719		251,163
2022	48,193		48,193		84,311
2021/Prior	232,438		232,438		169,495
Prior					89,603
Total loans	1,829,620		1,829,620		1,735,742
Current-period gross writeoffs
2026			3,731
2025			2,364		5,659
2024			50		2,001
2023					12
2022			38
Prior			6
Prior					1
Total	1,954	1,968	6,189	5,505	7,673
Commercial, financial and agricultural \| Domestic \| Commercial \| Pass
Loan portfolio by credit quality indicator
2026	695,601		695,601
2025	436,549		436,549		952,495
2024	111,877		111,877		172,120
2023	213,659		213,659		204,095
2022	48,154		48,154		84,301
2021/Prior	81,093		81,093		169,430
Prior					89,567
Total loans	1,586,933		1,586,933		1,672,008
Commercial, financial and agricultural \| Domestic \| Commercial \| Special Mention
Loan portfolio by credit quality indicator
2026	438		438
Total loans	438		438
Commercial, financial and agricultural \| Domestic \| Commercial \| Watch List - Pass
Loan portfolio by credit quality indicator
2026	520		520
2025	254		254		10,358
Total loans	774		774		10,358
Commercial, financial and agricultural \| Domestic \| Commercial \| Watch List - Substandard
Loan portfolio by credit quality indicator
2026	28		28
2025	727		727		705
2024	52		52		55
2023	81		81		183
2022	39		39
Prior					36
Total loans	927		927		979
Commercial, financial and agricultural \| Domestic \| Commercial \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2026	11,092		11,092
2025	32,675		32,675		4,735
2024	457		457		702
2023	44,979		44,979		46,885
2022					10
2021/Prior	151,345		151,345		65
Total loans	240,548		240,548		52,397
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial
Loan portfolio by credit quality indicator
2026	769,281		769,281
2025	647,685		647,685		973,650
2024	500,786		500,786		576,264
2023	431,409		431,409		582,769
2022	579,347		579,347		628,707
2021/Prior	155,970		155,970		176,016
Prior					245,564
Total loans	3,084,478		3,084,478		3,182,970
Current-period gross writeoffs
Total	47		47
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Pass
Loan portfolio by credit quality indicator
2026	701,765		701,765
2025	647,007		647,007		880,871
2024	500,786		500,786		576,080
2023	430,662		430,662		582,532
2022	579,347		579,347		628,474
2021/Prior	153,078		153,078		176,016
Prior					245,564
Total loans	3,012,645		3,012,645		3,089,537
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Special Mention
Loan portfolio by credit quality indicator
2026	7,972		7,972
2025	441		441		18,417
2021/Prior	1		1
Total loans	8,414		8,414		18,417
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Watch List - Pass
Loan portfolio by credit quality indicator
2026	4,558		4,558
2025					27,378
2024					184
Total loans	4,558		4,558		27,562
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Watch List - Substandard
Loan portfolio by credit quality indicator
2026	15,872		15,872
2025	237		237		1,918
2023	747		747		237
2022					233
Total loans	16,856		16,856		2,388
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2026	39,114		39,114
2025					45,066
2021/Prior	2,891		2,891
Total loans	42,005		42,005		45,066
Commercial, financial and agricultural \| Domestic \| Commercial real estate: multifamily
Loan portfolio by credit quality indicator
2026	119,007		119,007
2025	168,632		168,632		230,149
2024	255,478		255,478		109,926
2023	468,644		468,644		254,234
2022	27,230		27,230		49,276
2021/Prior	37,686		37,686		12,419
Prior					28,789
Total loans	1,076,677		1,076,677		684,793
Commercial, financial and agricultural \| Domestic \| Commercial real estate: multifamily \| Pass
Loan portfolio by credit quality indicator
2025					217,455
2024					79,833
2023					254,234
2022					49,276
2021/Prior					12,419
Prior					28,789
Total loans					642,006
Commercial, financial and agricultural \| Domestic \| Commercial real estate: multifamily \| Watch List - Substandard
Loan portfolio by credit quality indicator
2026	5,034		5,034
Total loans	5,034		5,034
Commercial, financial and agricultural \| Domestic \| Commercial real estate: multifamily \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2026	3,964		3,964
2025	12,750		12,750		12,694
2024	30,698		30,698		30,093
2022	3,530		3,530
Total loans	50,942		50,942		42,787
Commercial real estate
Loan portfolio by credit quality indicator
Total loans	2,279,623		2,279,623		2,338,593
Commercial real estate \| Domestic \| Commercial
Current-period gross writeoffs
Total				8,121
Commercial real estate \| Domestic \| Commercial real estate construction development
Loan portfolio by credit quality indicator
2026	726,364		726,364
2025	949,105		949,105		1,232,753
2024	376,914		376,914		535,419
2023	191,577		191,577		497,267
2022	22,141		22,141		37,432
2021/Prior	13,522		13,522		32,409
Prior					3,313
Total loans	2,279,623		2,279,623		2,338,593
Current-period gross writeoffs
2022					8,122
Total					8,122
Commercial real estate \| Domestic \| Commercial real estate construction development \| Pass
Loan portfolio by credit quality indicator
2026	720,650		720,650
2025	945,589		945,589		1,232,753
2024	376,914		376,914		535,289
2023	191,577		191,577		497,267
2022	21,130		21,130		37,432
2021/Prior	13,522		13,522		32,409
Prior					3,313
Total loans	2,269,382		2,269,382		2,338,463
Commercial real estate \| Domestic \| Commercial real estate construction development \| Special Mention
Loan portfolio by credit quality indicator
2026	350		350
2022	1,011		1,011
Total loans	1,361		1,361
Commercial real estate \| Domestic \| Commercial real estate construction development \| Watch List - Substandard
Loan portfolio by credit quality indicator
2026	5,364		5,364
2024					130
Total loans	5,364		5,364		130
Commercial real estate \| Domestic \| Commercial real estate construction development \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2025	3,516		3,516
Total loans	3,516		3,516
Real estate - mortgage
Loan portfolio by credit quality indicator
Total loans	1,091,215		1,091,215		1,074,510
Real estate - mortgage \| Domestic \| Residential First Lien
Loan portfolio by credit quality indicator
2026	208,043		208,043
2025	160,657		160,657		257,072
2024	79,970		79,970		84,639
2023	80,770		80,770		98,590
2022	59,220		59,220		71,421
2021/Prior	81,798		81,798		46,008
Prior					71,704
Total loans	670,458		670,458		629,434
Current-period gross writeoffs
2025			70
2024			100		101
2023			140
Prior			59
Prior					3
Total	165		369	49	104
Real estate - mortgage \| Domestic \| Residential First Lien \| Pass
Loan portfolio by credit quality indicator
2026	207,998		207,998
2025	160,644		160,644		257,052
2024	79,881		79,881		84,549
2023	80,770		80,770		98,590
2022	59,207		59,207		71,410
2021/Prior	81,602		81,602		45,734
Prior					71,704
Total loans	670,102		670,102		629,039
Real estate - mortgage \| Domestic \| Residential First Lien \| Watch List - Substandard
Loan portfolio by credit quality indicator
2026	45		45
2024	89		89		90
2022	13		13
2021/Prior	196		196		274
Total loans	343		343		364
Real estate - mortgage \| Domestic \| Residential First Lien \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2025	13		13		20
2022					11
Total loans	13		13		31
Real estate - mortgage \| Domestic \| Residential Junior Lien
Loan portfolio by credit quality indicator
2026	42,188		42,188
2025	45,290		45,290		55,556
2024	62,671		62,671		76,596
2023	49,422		49,422		58,790
2022	48,626		48,626		56,080
2021/Prior	172,560		172,560		59,089
Prior					138,965
Total loans	420,757		420,757		445,076
Current-period gross writeoffs
2025			72
2024					120
2022			71
2021					56
Prior			75
Prior					84
Total	105	1	218	203	260
Real estate - mortgage \| Domestic \| Residential Junior Lien \| Pass
Loan portfolio by credit quality indicator
2026	42,188		42,188
2025	45,290		45,290		55,556
2024	62,671		62,671		76,596
2023	49,422		49,422		58,790
2022	48,626		48,626		56,080
2021/Prior	172,560		172,560		59,089
Prior					138,965
Total loans	420,757		420,757		445,076
Consumer
Loan portfolio by credit quality indicator
Total loans	50,686		50,686		51,003
Consumer \| Domestic
Loan portfolio by credit quality indicator
2026	34,336		34,336
2025	12,926		12,926		39,920
2024	1,644		1,644		8,417
2023	195		195		664
2022	62		62		421
2021/Prior	1,523		1,523		128
Prior					1,453
Total loans	50,686		50,686		51,003
Current-period gross writeoffs
2026			90
2025			145		76
2024			28		99
2023					24
Prior			1
Prior					1
Total	121	$ 56	264	$ 124	200
Consumer \| Domestic \| Pass
Loan portfolio by credit quality indicator
2026	34,336		34,336
2025	12,926		12,926		39,920
2024	1,644		1,644		8,417
2023	195		195		664
2022	62		62		421
2021/Prior	1,523		1,523		128
Prior					1,453
Total loans	50,686		50,686		51,003
Foreign
Loan portfolio by credit quality indicator
Total loans	371,738		371,738		392,811
Foreign \| Foreign
Loan portfolio by credit quality indicator
2026	89,343		89,343
2025	192,652		192,652		276,180
2024	36,953		36,953		53,392
2023	31,952		31,952		35,700
2022	8,627		8,627		12,535
2021/Prior	12,211		12,211		10,454
Prior					4,550
Total loans	371,738		371,738		392,811
Foreign \| Foreign \| Pass
Loan portfolio by credit quality indicator
2026	89,343		89,343
2025	192,652		192,652		276,180
2024	36,953		36,953		53,392
2023	31,952		31,952		35,700
2022	8,627		8,627		12,535
2021/Prior	12,211		12,211		10,454
Prior					4,550
Total loans	$ 371,738		$ 371,738		$ 392,811