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Allowance for Credit Losses - Portfolio Credit Quality (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Loan portfolio by credit quality indicator
2025	$ 2,134,384		$ 2,134,384
2024	2,336,859		2,336,859		$ 3,472,021
2023	2,090,563		2,090,563		2,298,973
2022	1,120,841		1,120,841		1,284,843
2021	662,226		662,226		826,553
2020/Prior	793,747		793,747		404,659
Prior					522,777
Total loans	9,138,620		9,138,620		8,809,826
Current-period gross writeoffs
Total	9,978	$ 4,260	11,977	$ 32,084
Commercial, financial and agricultural
Loan portfolio by credit quality indicator
Total loans	5,288,360		5,288,360		5,089,721
Commercial, financial and agricultural \| Domestic \| Commercial
Loan portfolio by credit quality indicator
2025	621,545		621,545
2024	453,902		453,902		995,267
2023	341,927		341,927		405,836
2022	109,732		109,732		135,176
2021	182,716		182,716		214,824
2020/Prior	97,036		97,036		37,670
Prior					63,030
Total loans	1,806,858		1,806,858		1,851,803
Current-period gross writeoffs
2025			3,022
2024			515		5,711
2023					2,689
2022					25,686
2021					44
2020					14
Prior					5
Total	1,749	1,979	3,537	29,720	34,149
Commercial, financial and agricultural \| Domestic \| Commercial \| Pass
Loan portfolio by credit quality indicator
2025	606,234		606,234
2024	451,967		451,967		993,045
2023	294,786		294,786		343,212
2022	109,643		109,643		135,057
2021	182,551		182,551		214,702
2020/Prior	96,997		96,997		37,670
Prior					63,030
Total loans	1,742,178		1,742,178		1,786,716
Commercial, financial and agricultural \| Domestic \| Commercial \| Watch List - Pass
Loan portfolio by credit quality indicator
2025	10,855		10,855
2024	61		61
2023					11,113
Total loans	10,916		10,916		11,113
Commercial, financial and agricultural \| Domestic \| Commercial \| Watch List - Substandard
Loan portfolio by credit quality indicator
2025	17		17
2024	1,010		1,010		1,341
2023	267		267		327
2022	71		71		74
2021	93		93		122
2020/Prior	38		38
Total loans	1,496		1,496		1,864
Commercial, financial and agricultural \| Domestic \| Commercial \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2025	4,439		4,439
2024	864		864		881
2023	46,874		46,874		51,184
2022	18		18		45
2021	72		72
2020/Prior	1		1
Total loans	52,268		52,268		52,110
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial
Loan portfolio by credit quality indicator
2025	489,342		489,342
2024	740,672		740,672		903,313
2023	646,993		646,993		699,730
2022	515,290		515,290		545,802
2021	306,286		306,286		312,757
2020/Prior	406,719		406,719		220,867
Prior					245,334
Total loans	3,105,302		3,105,302		2,927,803
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Pass
Loan portfolio by credit quality indicator
2025	417,160		417,160
2024	725,235		725,235		814,273
2023	579,807		579,807		631,806
2022	500,224		500,224		531,035
2021	306,286		306,286		312,757
2020/Prior	406,368		406,368		220,510
Prior					245,334
Total loans	2,935,080		2,935,080		2,755,715
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Special Mention
Loan portfolio by credit quality indicator
2025	18,046		18,046
2024	463		463		643
2023	66,946		66,946		67,567
Total loans	85,455		85,455		68,210
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Watch List - Pass
Loan portfolio by credit quality indicator
2025	16,036		16,036
2024	199		199		16,490
2022	2,076		2,076
Total loans	18,311		18,311		16,490
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Watch List - Substandard
Loan portfolio by credit quality indicator
2024	2,073		2,073		18,934
2023	240		240		242
2022	445		445		2,122
2020/Prior	351		351		357
Total loans	3,109		3,109		21,655
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2025	38,100		38,100
2024	12,702		12,702		52,973
2023					115
2022	12,545		12,545		12,645
Total loans	63,347		63,347		65,733
Commercial, financial and agricultural \| Domestic \| Commercial real estate: multifamily
Loan portfolio by credit quality indicator
2025	113,499		113,499
2024	73,365		73,365		107,993
2023	20,837		20,837		36,602
2022	117,619		117,619		108,830
2021	18,253		18,253		18,621
2020/Prior	32,627		32,627		8,198
Prior					29,871
Total loans	376,200		376,200		310,115
Commercial, financial and agricultural \| Domestic \| Commercial real estate: multifamily \| Pass
Loan portfolio by credit quality indicator
2025	100,592		100,592
2024	43,234		43,234		90,092
2023	20,837		20,837		11,538
2022	117,619		117,619		108,830
2021	18,253		18,253		18,621
2020/Prior	32,627		32,627		8,198
Prior					29,871
Total loans	333,162		333,162		267,150
Commercial, financial and agricultural \| Domestic \| Commercial real estate: multifamily \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2025	12,907		12,907
2024	30,131		30,131		17,901
2023					25,064
Total loans	43,038		43,038		42,965
Commercial real estate
Loan portfolio by credit quality indicator
Total loans	2,563,794		2,563,794		2,484,454
Commercial real estate \| Domestic \| Commercial real estate construction development
Loan portfolio by credit quality indicator
2025	616,399		616,399
2024	792,615		792,615		1,029,750
2023	879,835		879,835		937,180
2022	227,451		227,451		330,470
2021	34,959		34,959		144,221
2020/Prior	12,535		12,535		39,908
Prior					2,925
Total loans	2,563,794		2,563,794		2,484,454
Current-period gross writeoffs
2023					1,146
2022			8,121		1,082
Total	8,121	2,228	8,121	2,228	2,228
Commercial real estate \| Domestic \| Commercial real estate construction development \| Pass
Loan portfolio by credit quality indicator
2025	598,585		598,585
2024	792,337		792,337		1,029,399
2023	879,835		879,835		921,180
2022	227,451		227,451		322,348
2021	34,959		34,959		144,221
2020/Prior	12,535		12,535		39,908
Prior					2,925
Total loans	2,545,702		2,545,702		2,459,981
Commercial real estate \| Domestic \| Commercial real estate construction development \| Special Mention
Loan portfolio by credit quality indicator
2025	17,814		17,814
2023					16,000
Total loans	17,814		17,814		16,000
Commercial real estate \| Domestic \| Commercial real estate construction development \| Watch List - Substandard
Loan portfolio by credit quality indicator
2024	278		278		278
Total loans	278		278		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	1,050,280		1,050,280		999,313
Real estate - mortgage \| Domestic \| Residential First Lien
Loan portfolio by credit quality indicator
2025	177,047		177,047
2024	96,392		96,392		180,861
2023	107,988		107,988		107,100
2022	75,175		75,175		81,640
2021	48,457		48,457		57,777
2020/Prior	83,206		83,206		29,316
Prior					73,390
Total loans	588,265		588,265		530,084
Current-period gross writeoffs
2025			48
Prior			1
Prior					46
Total	3	1	49	46	46
Real estate - mortgage \| Domestic \| Residential First Lien \| Pass
Loan portfolio by credit quality indicator
2025	177,047		177,047
2024	96,279		96,279		180,743
2023	107,988		107,988		107,100
2022	75,158		75,158		81,618
2021	48,162		48,162		57,503
2020/Prior	83,206		83,206		29,316
Prior					73,390
Total loans	587,840		587,840		529,670
Real estate - mortgage \| Domestic \| Residential First Lien \| Watch List - Substandard
Loan portfolio by credit quality indicator
2024	91		91		95
2021	295		295		274
Total loans	386		386		369
Real estate - mortgage \| Domestic \| Residential First Lien \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2024	22		22		23
2022	17		17		22
Total loans	39		39		45
Real estate - mortgage \| Domestic \| Residential Junior Lien
Loan portfolio by credit quality indicator
2025	29,907		29,907
2024	86,397		86,397		91,343
2023	66,502		66,502		73,740
2022	61,011		61,011		65,144
2021	64,754		64,754		70,969
2020/Prior	153,444		153,444		65,799
Prior					102,234
Total loans	462,015		462,015		469,229
Current-period gross writeoffs
2025			120
Prior			82
Total	82		202
Real estate - mortgage \| Domestic \| Residential Junior Lien \| Pass
Loan portfolio by credit quality indicator
2025	29,766		29,766
2024	86,397		86,397		91,202
2023	66,502		66,502		73,740
2022	61,011		61,011		65,144
2021	64,754		64,754		70,969
2020/Prior	153,444		153,444		65,799
Prior					102,234
Total loans	461,874		461,874		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	52,211		52,211		49,777
Consumer \| Domestic
Loan portfolio by credit quality indicator
2025	27,093		27,093
2024	19,416		19,416		38,778
2023	3,345		3,345		8,137
2022	591		591		904
2021	316		316		422
2020/Prior	1,450		1,450		22
Prior					1,514
Total loans	52,211		52,211		49,777
Current-period gross writeoffs
2025			32
2024			30		43
2023			5		120
2022					22
Prior			1
Total	23	$ 52	68	$ 90	185
Consumer \| Domestic \| Pass
Loan portfolio by credit quality indicator
2025	27,093		27,093
2024	19,416		19,416		38,778
2023	3,345		3,345		8,137
2022	591		591		904
2021	316		316		422
2020/Prior	1,450		1,450		22
Prior					1,514
Total loans	52,211		52,211		49,777
Foreign
Loan portfolio by credit quality indicator
Total loans	183,975		183,975		186,561
Foreign \| Foreign
Loan portfolio by credit quality indicator
2025	59,552		59,552
2024	74,100		74,100		124,716
2023	23,136		23,136		30,648
2022	13,972		13,972		16,877
2021	6,485		6,485		6,962
2020/Prior	6,730		6,730		2,879
Prior					4,479
Total loans	183,975		183,975		186,561
Foreign \| Foreign \| Pass
Loan portfolio by credit quality indicator
2025	59,552		59,552
2024	74,100		74,100		124,716
2023	23,136		23,136		30,648
2022	13,972		13,972		16,877
2021	6,485		6,485		6,962
2020/Prior	6,730		6,730		2,879
Prior					4,479
Total loans	$ 183,975		$ 183,975		$ 186,561