Loans and Allowance for Credit Losses - Loan Classification by Risk Rating Category (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
2022		$ 5,871,234
2021		7,662,897
2020		3,446,781
2019		2,153,822
2018		1,023,159
Prior		1,435,075
Revolving Loans		4,740,128
Total		26,333,096	$ 23,414,262
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022		5,821,426
2021		7,589,789
2020		3,363,237
2019		2,075,206
2018		1,011,557
Prior		1,388,571
Revolving Loans		4,647,762
Total		25,897,548
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022		33,417
2021		56,613
2020		76,379
2019		60,926
2018		7,393
Prior		38,856
Revolving Loans		61,444
Total		335,028
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	[1]	16,207
2021	[1]	13,986
2020	[1]	6,118
2019	[1]	12,881
2018	[1]	1,583
Prior	[1]	3,823
Revolving Loans	[1]	30,463
Total	[1]	85,061
Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		184
2021		2,509
2020		1,047
2019		4,809
2018		2,626
Prior		3,825
Revolving Loans		459
Total		15,459
Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving Loans		0
Total		0
Commercial real estate - Owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2022		600,675
2021		881,006
2020		669,563
2019		363,080
2018		283,213
Prior		380,578
Revolving Loans		64,903
Total		3,243,018	3,048,822
Commercial real estate - Owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022		574,287
2021		858,414
2020		658,343
2019		355,582
2018		280,823
Prior		366,273
Revolving Loans		51,913
Total		3,145,635
Commercial real estate - Owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022		24,128
2021		20,434
2020		9,556
2019		1,621
2018		1,247
Prior		11,280
Revolving Loans		12,990
Total		81,256
Commercial real estate - Owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	[1]	2,260
2021	[1]	1,007
2020	[1]	1,664
2019	[1]	5,620
2018	[1]	184
Prior	[1]	2,636
Revolving Loans	[1]	0
Total	[1]	13,371
Commercial real estate - Owner occupied | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		1,151
2020		0
2019		257
2018		959
Prior		389
Revolving Loans		0
Total		2,756
Commercial real estate - Owner occupied | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving Loans		0
Total		0
Commercial real estate - Non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,343,590
2021		1,605,864
2020		1,051,304
2019		844,396
2018		381,914
Prior		566,622
Revolving Loans		67,906
Total		5,861,596	5,221,704
Commercial real estate - Non-owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,336,133
2021		1,589,780
2020		987,203
2019		829,154
2018		381,453
Prior		539,685
Revolving Loans		67,906
Total		5,731,314
Commercial real estate - Non-owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022		7,457
2021		13,390
2020		60,295
2019		13,927
2018		0
Prior		26,254
Revolving Loans		0
Total		121,323
Commercial real estate - Non-owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	[1]	0
2021	[1]	1,654
2020	[1]	3,806
2019	[1]	1,315
2018	[1]	0
Prior	[1]	0
Revolving Loans	[1]	0
Total	[1]	6,775
Commercial real estate - Non-owner occupied | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		1,040
2020		0
2019		0
2018		461
Prior		683
Revolving Loans		0
Total		2,184
Commercial real estate - Non-owner occupied | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving Loans		0
Total		0
Consumer real estate – mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022		572,274
2021		1,187,157
2020		525,144
2019		265,549
2018		149,667
Prior		306,541
Revolving Loans		1,040,719
Total		4,047,051	3,680,684
Consumer real estate – mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022		572,274
2021		1,186,965
2020		523,748
2019		261,456
2018		148,454
Prior		304,406
Revolving Loans		1,040,556
Total		4,037,859
Consumer real estate – mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		0
2018		224
Prior		48
Revolving Loans		0
Total		272
Consumer real estate – mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	[1]	0
2021	[1]	0
2020	[1]	349
2019	[1]	0
2018	[1]	0
Prior	[1]	0
Revolving Loans	[1]	0
Total	[1]	349
Consumer real estate – mortgage | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		192
2020		1,047
2019		4,093
2018		989
Prior		2,087
Revolving Loans		163
Total		8,571
Consumer real estate – mortgage | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving Loans		0
Total		0
Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,028,112
2021		1,642,080
2020		515,833
2019		167,583
2018		8,294
Prior		10,793
Revolving Loans		14,171
Total		3,386,866	2,903,017
Construction and land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,027,671
2021		1,642,080
2020		515,833
2019		157,522
2018		8,281
Prior		10,448
Revolving Loans		14,171
Total		3,376,006
Construction and land development | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		9,849
2018		0
Prior		0
Revolving Loans		0
Total		9,849
Construction and land development | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	[1]	441
2021	[1]	0
2020	[1]	0
2019	[1]	8
2018	[1]	13
Prior	[1]	146
Revolving Loans	[1]	0
Total	[1]	608
Construction and land development | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		204
2018		0
Prior		199
Revolving Loans		0
Total		403
Construction and land development | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving Loans		0
Total		0
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2022		2,241,878
2021		2,221,961
2020		616,683
2019		509,743
2018		198,706
Prior		168,765
Revolving Loans		3,338,072
Total		9,295,808	8,074,546
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022		2,226,356
2021		2,187,721
2020		609,856
2019		468,021
2018		191,181
Prior		165,983
Revolving Loans		3,258,859
Total		9,107,977
Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,832
2021		22,789
2020		6,528
2019		35,529
2018		5,922
Prior		1,274
Revolving Loans		48,454
Total		122,328
Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	[1]	13,506
2021	[1]	11,325
2020	[1]	299
2019	[1]	5,938
2018	[1]	1,386
Prior	[1]	1,041
Revolving Loans	[1]	30,463
Total	[1]	63,958
Commercial and industrial | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		184
2021		126
2020		0
2019		255
2018		217
Prior		467
Revolving Loans		296
Total		1,545
Commercial and industrial | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving Loans		0
Total		0
Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2022		84,705
2021		124,829
2020		68,254
2019		3,471
2018		1,365
Prior		1,776
Revolving Loans		214,357
Total		498,757	$ 485,489
Consumer and other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022		84,705
2021		124,829
2020		68,254
2019		3,471
2018		1,365
Prior		1,776
Revolving Loans		214,357
Total		498,757
Consumer and other | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving Loans		0
Total		0
Consumer and other | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	[1]	0
2021	[1]	0
2020	[1]	0
2019	[1]	0
2018	[1]	0
Prior	[1]	0
Revolving Loans	[1]	0
Total	[1]	0
Consumer and other | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving Loans		0
Total		0
Consumer and other | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving Loans		0
Total		$ 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 troubled debt restructurings. Potential problem loans, which are not included in nonaccrual loans, amounted to approximately $85.1 million at June 30, 2022, compared to $109.6 million at December 31, 2021.