Loans and Allowance for Credit Losses - Loan Classification by Risk Rating Category (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024		Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 2,074,783			$ 7,801,081
2023	6,426,531			8,956,751
2022	9,041,311			5,834,396
2021	5,710,762			2,057,226
2020	1,962,509			1,215,843
Prior	2,228,160			1,222,983
Revolving Loans	5,718,817			5,587,811
Total	33,162,873			32,676,091
Charged-off loans	(20,832)		$ (14,022)
2023
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(3,763)
2022
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(4,989)
2021
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(4,838)
2020
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(1,292)
Prior
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(315)
Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(5,635)
2024
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2,009,349			7,731,335
2023	6,331,335			8,844,015
2022	8,916,086			5,742,666
2021	5,616,935			2,038,952
2020	1,911,754			1,202,431
Prior	2,181,116			1,196,095
Revolving Loans	5,612,343			5,479,475
Total	32,578,918			32,234,969
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	28,515			15,448
2023	62,351			90,359
2022	100,558			17,757
2021	20,102			13,996
2020	47,427			5,666
Prior	21,937			11,883
Revolving Loans	67,801			45,025
Total	348,691			200,134
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	23,258	[1]		41,393
2023	17,601	[1]		14,543
2022	13,338	[1]		28,573
2021	27,987	[1]		1,290
2020	100	[1]		2,122
Prior	10,997	[1]		9,793
Revolving Loans	33,658	[1]		60,986
Total	126,939	[1]		158,700
Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	13,661			12,905
2023	15,244			7,834
2022	11,329			45,400
2021	45,738			2,987
2020	3,228			5,624
Prior	14,110			5,212
Revolving Loans	5,015			2,325
Total	108,325			82,287
Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			0
2023	0			0
2022	0			0
2021	0			1
2020	0			0
Prior	0			0
Revolving Loans	0			0
Total	0			1
Commercial real estate - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2024	136,317			794,738
2023	785,086			1,170,695
2022	1,133,185			880,637
2021	849,504			505,710
2020	494,675			273,469
Prior	585,061			362,967
Revolving Loans	61,145			56,680
Total	4,044,973			4,044,896
Charged-off loans	(94)		0
Commercial real estate - owner occupied | 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial real estate - owner occupied | 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial real estate - owner occupied | 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial real estate - owner occupied | 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial real estate - owner occupied | Prior
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(94)
Commercial real estate - owner occupied | Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial real estate - owner occupied | 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial real estate - owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	125,532			785,834
2023	777,221			1,123,425
2022	1,095,086			871,389
2021	836,473			502,260
2020	475,646			267,595
Prior	570,092			357,339
Revolving Loans	61,145			56,680
Total	3,941,195			3,964,522
Commercial real estate - owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	10,785			1,595
2023	1,534			37,324
2022	28,271			5,300
2021	7,954			2,252
2020	17,863			5,306
Prior	13,292			4,701
Revolving Loans	0			0
Total	79,699			56,478
Commercial real estate - owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	[1]		5,528
2023	0	[1]		9,331
2022	9,275	[1]		3,262
2021	3,244	[1]		1,145
2020	83	[1]		568
Prior	770	[1]		610
Revolving Loans	0	[1]		0
Total	13,372	[1]		20,444
Commercial real estate - owner occupied | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			1,781
2023	6,331			615
2022	553			686
2021	1,833			53
2020	1,083			0
Prior	907			317
Revolving Loans	0			0
Total	10,707			3,452
Commercial real estate - owner occupied | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			0
2023	0			0
2022	0			0
2021	0			0
2020	0			0
Prior	0			0
Revolving Loans	0			0
Total	0			0
Commercial real estate - non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2024	416,647			1,329,832
2023	1,265,411			2,715,626
2022	2,800,587			1,777,455
2021	2,023,505			720,724
2020	677,634			507,178
Prior	766,542			376,317
Revolving Loans	113,316			108,362
Total	8,063,642			7,535,494
Charged-off loans	(2,000)		0
Commercial real estate - non-owner occupied | 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial real estate - non-owner occupied | 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial real estate - non-owner occupied | 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(2,000)
Commercial real estate - non-owner occupied | 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial real estate - non-owner occupied | Prior
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial real estate - non-owner occupied | Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial real estate - non-owner occupied | 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial real estate - non-owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	392,120			1,304,109
2023	1,251,928			2,682,275
2022	2,767,542			1,737,275
2021	1,985,325			713,979
2020	653,531			505,767
Prior	758,134			370,420
Revolving Loans	112,795			107,841
Total	7,921,375			7,421,666
Commercial real estate - non-owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	11,229			0
2023	0			30,229
2022	29,956			0
2021	0			6,745
2020	24,103			216
Prior	6,689			5,335
Revolving Loans	0			0
Total	71,977			42,525
Commercial real estate - non-owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	[1]		25,723
2023	13,483	[1]		2,969
2022	2,962	[1]		0
2021	0	[1]		0
2020	0	[1]		1,195
Prior	1,246	[1]		73
Revolving Loans	0	[1]		0
Total	17,691	[1]		29,960
Commercial real estate - non-owner occupied | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	13,298			0
2023	0			153
2022	127			40,180
2021	38,180			0
2020	0			0
Prior	473			489
Revolving Loans	521			521
Total	52,599			41,343
Commercial real estate - non-owner occupied | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			0
2023	0			0
2022	0			0
2021	0			0
2020	0			0
Prior	0			0
Revolving Loans	0			0
Total	0			0
Consumer real estate – mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2024	61,138			573,808
2023	556,673			978,271
2022	960,846			1,059,671
2021	1,040,618			450,945
2020	436,451			213,055
Prior	513,570			322,176
Revolving Loans	1,259,120			1,253,605
Total	4,828,416			4,851,531
Charged-off loans	(623)		(130)
Consumer real estate – mortgage | 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Consumer real estate – mortgage | 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(308)
Consumer real estate – mortgage | 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(120)
Consumer real estate – mortgage | 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(134)
Consumer real estate – mortgage | Prior
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(61)
Consumer real estate – mortgage | Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Consumer real estate – mortgage | 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Consumer real estate – mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	61,138			573,120
2023	554,848			976,006
2022	957,384			1,056,720
2021	1,036,933			448,420
2020	434,418			207,790
Prior	502,025			318,505
Revolving Loans	1,258,040			1,253,091
Total	4,804,786			4,833,652
Consumer real estate – mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			0
2023	0			0
2022	0			0
2021	0			0
2020	0			0
Prior	0			0
Revolving Loans	0			0
Total	0			0
Consumer real estate – mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	[1]		0
2023	0	[1]		0
2022	0	[1]		0
2021	0	[1]		0
2020	0	[1]		0
Prior	0	[1]		0
Revolving Loans	0	[1]		0
Total	0	[1]		0
Consumer real estate – mortgage | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			688
2023	1,825			2,265
2022	3,462			2,951
2021	3,685			2,525
2020	2,033			5,265
Prior	11,545			3,671
Revolving Loans	1,080			514
Total	23,630			17,879
Consumer real estate – mortgage | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			0
2023	0			0
2022	0			0
2021	0			0
2020	0			0
Prior	0			0
Revolving Loans	0			0
Total	0			0
Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
2024	233,751			1,155,865
2023	987,746			1,930,670
2022	1,905,633			884,060
2021	620,421			16,569
2020	16,106			5,580
Prior	10,186			6,451
Revolving Loans	44,491			41,886
Total	3,818,334			4,041,081
Charged-off loans	0		0
Construction and land development | 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Construction and land development | 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Construction and land development | 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Construction and land development | 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Construction and land development | Prior
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Construction and land development | Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Construction and land development | 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Construction and land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	233,531			1,153,137
2023	985,950			1,930,062
2022	1,904,713			884,060
2021	620,421			12,102
2020	11,167			5,580
Prior	10,104			6,369
Revolving Loans	44,491			41,886
Total	3,810,377			4,033,196
Construction and land development | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	220			2,728
2023	1,796			0
2022	326			0
2021	0			4,467
2020	4,914			0
Prior	0			0
Revolving Loans	0			0
Total	7,256			7,195
Construction and land development | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	[1]		0
2023	0	[1]		0
2022	0	[1]		0
2021	0	[1]		0
2020	0	[1]		0
Prior	0	[1]		82
Revolving Loans	0	[1]		0
Total	0	[1]		82
Construction and land development | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			0
2023	0			608
2022	594			0
2021	0			0
2020	25			0
Prior	82			0
Revolving Loans	0			0
Total	701			608
Construction and land development | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			0
2023	0			0
2022	0			0
2021	0			0
2020	0			0
Prior	0			0
Revolving Loans	0			0
Total	0			0
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,126,400			3,810,029
2023	2,797,264			2,132,715
2022	2,215,635			1,166,447
2021	1,115,687			326,263
2020	303,750			216,020
Prior	351,817			154,416
Revolving Loans	3,982,645			3,860,801
Total	11,893,198			11,666,691
Charged-off loans	(14,808)		(10,649)
Commercial and industrial | 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(3,605)
Commercial and industrial | 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(4,613)
Commercial and industrial | 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(1,723)
Commercial and industrial | 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(577)
Commercial and industrial | Prior
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(135)
Commercial and industrial | Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(4,155)
Commercial and industrial | 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,096,498			3,778,326
2023	2,727,037			2,103,473
2022	2,165,936			1,127,096
2021	1,076,829			325,176
2020	303,099			215,158
Prior	339,780			142,806
Revolving Loans	3,877,845			3,753,575
Total	11,587,024			11,445,610
Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	6,281			11,125
2023	59,021			22,806
2022	42,005			12,457
2021	12,148			532
2020	547			144
Prior	1,956			1,847
Revolving Loans	67,801			45,025
Total	189,759			93,936
Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	23,258	[1]		10,142
2023	4,118	[1]		2,243
2022	1,101	[1]		25,311
2021	24,743	[1]		145
2020	17	[1]		359
Prior	8,981	[1]		9,028
Revolving Loans	33,658	[1]		60,986
Total	95,876	[1]		108,214
Commercial and industrial | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	363			10,436
2023	7,088			4,193
2022	6,593			1,583
2021	1,967			409
2020	87			359
Prior	1,100			735
Revolving Loans	3,341			1,215
Total	20,539			18,930
Commercial and industrial | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			0
2023	0			0
2022	0			0
2021	0			1
2020	0			0
Prior	0			0
Revolving Loans	0			0
Total	0			1
Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	100,530			136,809
2023	34,351			28,774
2022	25,425			66,126
2021	61,027			37,015
2020	33,893			541
Prior	984			656
Revolving Loans	258,100			266,477
Total	514,310			536,398
Charged-off loans	(3,307)		$ (3,243)
Consumer and other | 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(158)
Consumer and other | 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(68)
Consumer and other | 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(995)
Consumer and other | 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(581)
Consumer and other | Prior
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(25)
Consumer and other | Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	(1,480)
Consumer and other | 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Charged-off loans	0
Consumer and other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	100,530			136,809
2023	34,351			28,774
2022	25,425			66,126
2021	60,954			37,015
2020	33,893			541
Prior	981			656
Revolving Loans	258,027			266,402
Total	514,161			536,323
Consumer and other | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			0
2023	0			0
2022	0			0
2021	0			0
2020	0			0
Prior	0			0
Revolving Loans	0			0
Total	0			0
Consumer and other | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	[1]		0
2023	0	[1]		0
2022	0	[1]		0
2021	0	[1]		0
2020	0	[1]		0
Prior	0	[1]		0
Revolving Loans	0	[1]		0
Total	0	[1]		0
Consumer and other | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			0
2023	0			0
2022	0			0
2021	73			0
2020	0			0
Prior	3			0
Revolving Loans	73			75
Total	149			75
Consumer and other | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0			0
2023	0			0
2022	0			0
2021	0			0
2020	0			0
Prior	0			0
Revolving Loans	0			0
Total	$ 0			$ 0

[1] Potential problem loans represent those loans with a well-defined weakness and where information about possible credit problems of borrowers has caused management to have doubts about the borrower's ability to comply with present repayment terms. This definition is believed to be substantially consistent with the standards established by Pinnacle Bank's primary regulators for loans classified as substandard, excluding loan modifications made to borrowers experiencing financial difficulty. Potential problem loans, which are not included in nonaccrual loans, amounted to approximately $94.2 million at March 31, 2024, compared to $127.4 million at December 31, 2023.