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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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Loan portfolio by credit quality indicator
2026	$ 1,963,360		$ 1,963,360
2025	3,005,044		3,005,044		$ 4,033,573
2024	1,506,590		1,506,590		1,617,530
2023	1,626,595		1,626,595		1,779,177
2022	829,215		829,215		940,183
2021/Prior	932,395		932,395		506,018
Prior					583,941
Total loans	9,863,199		9,863,199		9,460,422
Current-period gross writeoffs
Total	2,068	$ 9,978	4,695	$ 11,977
Domestic \| Commercial real estate: multifamily \| Pass
Loan portfolio by credit quality indicator
2026	107,231		107,231
2025	156,623		156,623
2024	166,280		166,280
2023	453,165		453,165
2022	27,330		27,330
2021/Prior	38,144		38,144
Total loans	948,773		948,773
Commercial, financial and agricultural
Loan portfolio by credit quality indicator
Total loans	6,036,796		6,036,796		5,603,505
Commercial, financial and agricultural \| Domestic \| Commercial
Loan portfolio by credit quality indicator
2026	476,949		476,949
2025	645,941		645,941		968,293
2024	135,677		135,677		172,877
2023	175,574		175,574		251,163
2022	56,363		56,363		84,311
2021/Prior	252,849		252,849		169,495
Prior					89,603
Total loans	1,743,353		1,743,353		1,735,742
Current-period gross writeoffs
2026			1,777
2025			2,364		5,659
2024			50		2,001
2023					12
2022			38
Prior			6
Prior					1
Total	1,794	1,749	4,235	3,537	7,673
Commercial, financial and agricultural \| Domestic \| Commercial \| Pass
Loan portfolio by credit quality indicator
2026	465,235		465,235
2025	611,770		611,770		952,495
2024	135,095		135,095		172,120
2023	128,757		128,757		204,095
2022	56,317		56,317		84,301
2021/Prior	101,508		101,508		169,430
Prior					89,567
Total loans	1,498,682		1,498,682		1,672,008
Commercial, financial and agricultural \| Domestic \| Commercial \| Special Mention
Loan portfolio by credit quality indicator
2025	448		448
Total loans	448		448
Commercial, financial and agricultural \| Domestic \| Commercial \| Watch List - Pass
Loan portfolio by credit quality indicator
2026	615		615
2025	263		263		10,358
2021/Prior	36,597		36,597
Total loans	37,475		37,475		10,358
Commercial, financial and agricultural \| Domestic \| Commercial \| Watch List - Substandard
Loan portfolio by credit quality indicator
2026	35		35
2025	1,112		1,112		705
2024	53		53		55
2023	106		106		183
2022	46		46
Prior					36
Total loans	1,352		1,352		979
Commercial, financial and agricultural \| Domestic \| Commercial \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2026	11,064		11,064
2025	32,348		32,348		4,735
2024	529		529		702
2023	46,711		46,711		46,885
2022					10
2021/Prior	114,744		114,744		65
Total loans	205,396		205,396		52,397
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial
Loan portfolio by credit quality indicator
2026	702,636		702,636
2025	723,620		723,620		973,650
2024	523,266		523,266		576,264
2023	549,654		549,654		582,769
2022	600,710		600,710		628,707
2021/Prior	200,262		200,262		176,016
Prior					245,564
Total loans	3,300,148		3,300,148		3,182,970
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Pass
Loan portfolio by credit quality indicator
2026	646,887		646,887
2025	705,901		705,901		880,871
2024	523,096		523,096		576,080
2023	548,906		548,906		582,532
2022	600,710		600,710		628,474
2021/Prior	200,262		200,262		176,016
Prior					245,564
Total loans	3,225,762		3,225,762		3,089,537
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Special Mention
Loan portfolio by credit quality indicator
2026	155		155
2025	8,006		8,006		18,417
Total loans	8,161		8,161		18,417
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Watch List - Pass
Loan portfolio by credit quality indicator
2026	4,419		4,419
2025					27,378
2024	170		170		184
Total loans	4,589		4,589		27,562
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Watch List - Substandard
Loan portfolio by credit quality indicator
2026	15,952		15,952
2025	1,566		1,566		1,918
2023	748		748		237
2022					233
Total loans	18,266		18,266		2,388
Commercial, financial and agricultural \| Domestic \| Commercial real estate: farmland & commercial \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2026	35,223		35,223
2025	8,147		8,147		45,066
Total loans	43,370		43,370		45,066
Commercial, financial and agricultural \| Domestic \| Commercial real estate: multifamily
Loan portfolio by credit quality indicator
2026	108,977		108,977
2025	169,306		169,306		230,149
2024	196,373		196,373		109,926
2023	453,165		453,165		254,234
2022	27,330		27,330		49,276
2021/Prior	38,144		38,144		12,419
Prior					28,789
Total loans	993,295		993,295		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 - Doubtful
Loan portfolio by credit quality indicator
2026	1,746		1,746
2025	12,683		12,683		12,694
2024	30,093		30,093		30,093
Total loans	44,522		44,522		42,787
Commercial real estate
Loan portfolio by credit quality indicator
Total loans	2,279,481		2,279,481		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	458,900		458,900
2025	1,008,316		1,008,316		1,232,753
2024	468,158		468,158		535,419
2023	289,093		289,093		497,267
2022	27,241		27,241		37,432
2021/Prior	27,773		27,773		32,409
Prior					3,313
Total loans	2,279,481		2,279,481		2,338,593
Current-period gross writeoffs
2022					8,122
Total		8,121			8,122
Commercial real estate \| Domestic \| Commercial real estate construction development \| Pass
Loan portfolio by credit quality indicator
2026	453,146		453,146
2025	1,004,142		1,004,142		1,232,753
2024	468,031		468,031		535,289
2023	289,093		289,093		497,267
2022	26,215		26,215		37,432
2021/Prior	27,773		27,773		32,409
Prior					3,313
Total loans	2,268,400		2,268,400		2,338,463
Commercial real estate \| Domestic \| Commercial real estate construction development \| Special Mention
Loan portfolio by credit quality indicator
2025	350		350
2022	1,026		1,026
Total loans	1,376		1,376
Commercial real estate \| Domestic \| Commercial real estate construction development \| Watch List - Substandard
Loan portfolio by credit quality indicator
2026	5,754		5,754
2024	127		127		130
Total loans	5,881		5,881		130
Commercial real estate \| Domestic \| Commercial real estate construction development \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2025	3,824		3,824
Total loans	3,824		3,824
Real estate - mortgage
Loan portfolio by credit quality indicator
Total loans	1,095,001		1,095,001		1,074,510
Real estate - mortgage \| Domestic \| Residential First Lien
Loan portfolio by credit quality indicator
2026	91,101		91,101
2025	154,889		154,889		257,072
2024	68,625		68,625		84,639
2023	73,802		73,802		98,590
2022	57,385		57,385		71,421
2021/Prior	216,984		216,984		46,008
Prior					71,704
Total loans	662,786		662,786		629,434
Current-period gross writeoffs
2024			42		101
2023			140
Prior			22
Prior					3
Total	52	3	204	49	104
Real estate - mortgage \| Domestic \| Residential First Lien \| Pass
Loan portfolio by credit quality indicator
2026	91,055		91,055
2025	154,874		154,874		257,052
2024	68,536		68,536		84,549
2023	73,802		73,802		98,590
2022	57,379		57,379		71,410
2021/Prior	216,770		216,770		45,734
Prior					71,704
Total loans	662,416		662,416		629,039
Real estate - mortgage \| Domestic \| Residential First Lien \| Watch List - Substandard
Loan portfolio by credit quality indicator
2026	46		46
2024	89		89		90
2021/Prior	213		213		274
Total loans	348		348		364
Real estate - mortgage \| Domestic \| Residential First Lien \| Watch List - Doubtful
Loan portfolio by credit quality indicator
2025	15		15		20
2022	6		6		11
2021/Prior	1		1
Total loans	22		22		31
Real estate - mortgage \| Domestic \| Residential Junior Lien
Loan portfolio by credit quality indicator
2026	27,269		27,269
2025	54,270		54,270		55,556
2024	66,418		66,418		76,596
2023	51,988		51,988		58,790
2022	50,652		50,652		56,080
2021/Prior	181,618		181,618		59,089
Prior					138,965
Total loans	432,215		432,215		445,076
Current-period gross writeoffs
2024					120
2022			71
2021					56
Prior			42
Prior					84
Total	113	82	113	202	260
Real estate - mortgage \| Domestic \| Residential Junior Lien \| Pass
Loan portfolio by credit quality indicator
2026	27,269		27,269
2025	54,270		54,270		55,556
2024	66,418		66,418		76,596
2023	51,988		51,988		58,790
2022	50,652		50,652		56,080
2021/Prior	181,618		181,618		59,089
Prior					138,965
Total loans	432,215		432,215		445,076
Consumer
Loan portfolio by credit quality indicator
Total loans	50,120		50,120		51,003
Consumer \| Domestic
Loan portfolio by credit quality indicator
2026	25,345		25,345
2025	19,385		19,385		39,920
2024	3,357		3,357		8,417
2023	232		232		664
2022	266		266		421
2021/Prior	1,535		1,535		128
Prior					1,453
Total loans	50,120		50,120		51,003
Current-period gross writeoffs
2026			40
2025			78		76
2024			24		99
2023					24
Prior			1
Prior					1
Total	109	$ 23	143	$ 68	200
Consumer \| Domestic \| Pass
Loan portfolio by credit quality indicator
2026	25,345		25,345
2025	19,385		19,385		39,920
2024	3,357		3,357		8,417
2023	232		232		664
2022	266		266		421
2021/Prior	1,535		1,535		128
Prior					1,453
Total loans	50,120		50,120		51,003
Foreign
Loan portfolio by credit quality indicator
Total loans	401,801		401,801		392,811
Foreign \| Foreign
Loan portfolio by credit quality indicator
2026	72,183		72,183
2025	229,317		229,317		276,180
2024	44,716		44,716		53,392
2023	33,087		33,087		35,700
2022	9,268		9,268		12,535
2021/Prior	13,230		13,230		10,454
Prior					4,550
Total loans	401,801		401,801		392,811
Foreign \| Foreign \| Pass
Loan portfolio by credit quality indicator
2026	72,183		72,183
2025	229,317		229,317		276,180
2024	44,716		44,716		53,392
2023	33,087		33,087		35,700
2022	9,268		9,268		12,535
2021/Prior	13,230		13,230		10,454
Prior					4,550
Total loans	$ 401,801		$ 401,801		$ 392,811