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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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Loan portfolio by credit quality indicator
2025	$ 3,083,828		$ 3,083,828
2024	2,001,886		2,001,886		$ 3,472,021
2023	1,938,258		1,938,258		2,298,973
2022	1,072,088		1,072,088		1,284,843
2021	599,048		599,048		826,553
2020/Prior	705,861		705,861		404,659
Prior					522,777
Total loans	9,400,969		9,400,969		8,809,826
Current-period gross writeoffs
Total	2,025	$ 2,371	14,002	$ 34,455
Commercial, financial and agricultural
Loan portfolio by credit quality indicator
Total loans	5,824,284		5,824,284		5,089,721
Commercial, financial and agricultural \| Domestic \| Commercial
Loan portfolio by credit quality indicator
2025	888,879		888,879
2024	278,871		278,871		995,267
2023	269,786		269,786		405,836
2022	96,728		96,728		135,176
2021	172,361		172,361		214,824
2020/Prior	96,017		96,017		37,670
Prior					63,030
Total loans	1,802,642		1,802,642		1,851,803
Current-period gross writeoffs
2025			3,517
2024			1,985		5,711
2023					2,689
2022					25,686
2021					44
2020					14
Prior			3
Prior					5
Total	1,968	2,329	5,505	32,049	34,149
Commercial, financial and agricultural \| Domestic \| Commercial \| Pass
Loan portfolio by credit quality indicator
2025	872,922		872,922
2024	277,736		277,736		993,045
2023	222,694		222,694		343,212
2022	96,728		96,728		135,057
2021	172,289		172,289		214,702
2020/Prior	96,017		96,017		37,670
Prior					63,030
Total loans	1,738,386		1,738,386		1,786,716
Commercial, financial and agricultural \| Domestic \| Commercial \| Special Mention
Loan portfolio by credit quality indicator
2024	48		48
Total loans	48		48
Commercial, financial and agricultural \| Domestic \| Commercial \| Watch List - Pass
Loan portfolio by credit quality indicator
2025	10,536		10,536
2023					11,113
Total loans	10,536		10,536		11,113
Commercial, financial and agricultural \| Domestic \| Commercial \| Watch List - Substandard
Loan portfolio by credit quality indicator
2025	734		734
2024	356		356		1,341
2023	219		219		327
2022					74
2021	72		72		122
Total loans	1,381		1,381		1,864
Commercial, financial and agricultural \| Domestic \| Commercial \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2025	4,687		4,687
2024	731		731		881
2023	46,873		46,873		51,184
2022					45
Total loans	52,291		52,291		52,110
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial
Loan portfolio by credit quality indicator
2025	729,284		729,284
2024	695,739		695,739		903,313
2023	716,057		716,057		699,730
2022	656,014		656,014		545,802
2021	259,581		259,581		312,757
2020/Prior	343,159		343,159		220,867
Prior					245,334
Total loans	3,399,834		3,399,834		2,927,803
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Pass
Loan portfolio by credit quality indicator
2025	648,406		648,406
2024	691,463		691,463		814,273
2023	650,682		650,682		631,806
2022	641,119		641,119		531,035
2021	259,581		259,581		312,757
2020/Prior	342,471		342,471		220,510
Prior					245,334
Total loans	3,233,722		3,233,722		2,755,715
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Special Mention
Loan portfolio by credit quality indicator
2025	18,463		18,463
2024	2,657		2,657		643
2023	65,135		65,135		67,567
2022	2,053		2,053
2020/Prior	339		339
Total loans	88,647		88,647		68,210
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Watch List - Pass
Loan portfolio by credit quality indicator
2025	15,928		15,928
2024	193		193		16,490
Total loans	16,121		16,121		16,490
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Watch List - Substandard
Loan portfolio by credit quality indicator
2025	147		147
2024	1,426		1,426		18,934
2023	240		240		242
2022	447		447		2,122
2020/Prior	349		349		357
Total loans	2,609		2,609		21,655
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2025	46,340		46,340
2024					52,973
2023					115
2022	12,395		12,395		12,645
Total loans	58,735		58,735		65,733
Commercial, financial and agricultural \| Domestic \| Commercial real estate: multifamily
Loan portfolio by credit quality indicator
2025	124,415		124,415
2024	88,761		88,761		107,993
2023	249,721		249,721		36,602
2022	116,980		116,980		108,830
2021	12,535		12,535		18,621
2020/Prior	29,396		29,396		8,198
Prior					29,871
Total loans	621,808		621,808		310,115
Commercial, financial and agricultural \| Domestic \| Commercial real estate: multifamily \| Pass
Loan portfolio by credit quality indicator
2025	111,717		111,717
2024	58,696		58,696		90,092
2023	249,721		249,721		11,538
2022	116,980		116,980		108,830
2021	12,535		12,535		18,621
2020/Prior	29,396		29,396		8,198
Prior					29,871
Total loans	579,045		579,045		267,150
Commercial, financial and agricultural \| Domestic \| Commercial real estate: multifamily \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2025	12,698		12,698
2024	30,065		30,065		17,901
2023					25,064
Total loans	42,763		42,763		42,965
Commercial real estate
Loan portfolio by credit quality indicator
Total loans	2,226,013		2,226,013		2,484,454
Commercial real estate \| Domestic \| Commercial real estate construction development
Loan portfolio by credit quality indicator
2025	935,552		935,552
2024	691,572		691,572		1,029,750
2023	500,643		500,643		937,180
2022	56,591		56,591		330,470
2021	33,689		33,689		144,221
2020/Prior	7,966		7,966		39,908
Prior					2,925
Total loans	2,226,013		2,226,013		2,484,454
Current-period gross writeoffs
2023					1,146
2022			8,121		1,082
Total			8,121	2,228	2,228
Commercial real estate \| Domestic \| Commercial real estate construction development \| Pass
Loan portfolio by credit quality indicator
2025	917,894		917,894
2024	691,297		691,297		1,029,399
2023	500,643		500,643		921,180
2022	56,591		56,591		322,348
2021	33,689		33,689		144,221
2020/Prior	7,966		7,966		39,908
Prior					2,925
Total loans	2,208,080		2,208,080		2,459,981
Commercial real estate \| Domestic \| Commercial real estate construction development \| Special Mention
Loan portfolio by credit quality indicator
2025	17,658		17,658
2023					16,000
Total loans	17,658		17,658		16,000
Commercial real estate \| Domestic \| Commercial real estate construction development \| Watch List - Substandard
Loan portfolio by credit quality indicator
2024	275		275		278
Total loans	275		275		278
Commercial real estate \| Domestic \| Commercial real estate construction development \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2024					73
2022					8,122
Total loans					8,195
Real estate - mortgage
Loan portfolio by credit quality indicator
Total loans	1,057,166		1,057,166		999,313
Real estate - mortgage \| Domestic \| Residential First Lien
Loan portfolio by credit quality indicator
2025	208,962		208,962
2024	93,195		93,195		180,861
2023	101,093		101,093		107,100
2022	73,446		73,446		81,640
2021	47,066		47,066		57,777
2020/Prior	76,759		76,759		29,316
Prior					73,390
Total loans	600,521		600,521		530,084
Current-period gross writeoffs
2024			46
Prior			3
Prior					46
Total			49	46	46
Real estate - mortgage \| Domestic \| Residential First Lien \| Pass
Loan portfolio by credit quality indicator
2025	208,940		208,940
2024	93,104		93,104		180,743
2023	101,093		101,093		107,100
2022	73,430		73,430		81,618
2021	46,778		46,778		57,503
2020/Prior	76,759		76,759		29,316
Prior					73,390
Total loans	600,104		600,104		529,670
Real estate - mortgage \| Domestic \| Residential First Lien \| Watch List - Substandard
Loan portfolio by credit quality indicator
2024	91		91		95
2021	288		288		274
Total loans	379		379		369
Real estate - mortgage \| Domestic \| Residential First Lien \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2025	22		22
2024					23
2022	16		16		22
Total loans	38		38		45
Real estate - mortgage \| Domestic \| Residential Junior Lien
Loan portfolio by credit quality indicator
2025	47,248		47,248
2024	81,204		81,204		91,343
2023	62,592		62,592		73,740
2022	58,044		58,044		65,144
2021	62,637		62,637		70,969
2020/Prior	144,920		144,920		65,799
Prior					102,234
Total loans	456,645		456,645		469,229
Current-period gross writeoffs
2024			120
Prior			83
Total	1		203
Real estate - mortgage \| Domestic \| Residential Junior Lien \| Pass
Loan portfolio by credit quality indicator
2025	47,107		47,107
2024	81,204		81,204		91,202
2023	62,592		62,592		73,740
2022	58,044		58,044		65,144
2021	62,637		62,637		70,969
2020/Prior	144,920		144,920		65,799
Prior					102,234
Total loans	456,504		456,504		469,088
Real estate - mortgage \| Domestic \| Residential Junior Lien \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2025	141		141
2024					141
Total loans	141		141		141
Consumer
Loan portfolio by credit quality indicator
Total loans	50,741		50,741		49,777
Consumer \| Domestic
Loan portfolio by credit quality indicator
2025	34,388		34,388
2024	12,760		12,760		38,778
2023	1,488		1,488		8,137
2022	499		499		904
2021	154		154		422
2020/Prior	1,452		1,452		22
Prior					1,514
Total loans	50,741		50,741		49,777
Current-period gross writeoffs
2025			24
2024			77		43
2023			23		120
2022					22
Total	56	$ 42	124	$ 132	185
Consumer \| Domestic \| Pass
Loan portfolio by credit quality indicator
2025	34,388		34,388
2024	12,760		12,760		38,778
2023	1,488		1,488		8,137
2022	499		499		904
2021	154		154		422
2020/Prior	1,452		1,452		22
Prior					1,514
Total loans	50,741		50,741		49,777
Foreign
Loan portfolio by credit quality indicator
Total loans	242,765		242,765		186,561
Foreign \| Foreign
Loan portfolio by credit quality indicator
2025	115,100		115,100
2024	59,784		59,784		124,716
2023	36,878		36,878		30,648
2022	13,786		13,786		16,877
2021	11,025		11,025		6,962
2020/Prior	6,192		6,192		2,879
Prior					4,479
Total loans	242,765		242,765		186,561
Foreign \| Foreign \| Pass
Loan portfolio by credit quality indicator
2025	115,100		115,100
2024	59,784		59,784		124,716
2023	36,878		36,878		30,648
2022	13,786		13,786		16,877
2021	11,025		11,025		6,962
2020/Prior	6,192		6,192		2,879
Prior					4,479
Total loans	$ 242,765		$ 242,765		$ 186,561