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Loans and Allowance for Credit Losses - Loan Classification by Risk Rating Category (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 $ 2,789,843   $ 8,026,428
2024 6,939,340   4,748,138
2023 4,465,192   8,284,234
2022 8,029,518   4,846,765
2021 4,429,704   1,575,443
Prior 2,911,654   1,594,205
Revolving Loans 6,571,495   6,410,563
Charged-off loans (17,972) $ (20,832)  
Potential problem loans 54,300   46,900
Financing Receivable, before Allowance for Credit Loss 36,136,746   35,485,776
2024      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (1,984)    
2023      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (3,247)    
2022      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (3,319)    
2021      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (1,921)    
Prior      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (764)    
Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (6,737)    
2025      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 2,761,146   7,926,441
2024 6,865,526   4,612,540
2023 4,330,891   8,154,123
2022 7,833,544   4,720,082
2021 4,213,252   1,559,402
Prior 2,852,204   1,559,598
Revolving Loans 6,492,935   6,329,457
Financing Receivable, before Allowance for Credit Loss 35,349,498   34,861,643
Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 23,385   85,197
2024 65,143   99,687
2023 80,629   91,000
2022 124,330   61,027
2021 162,285   11,821
Prior 29,741   7,536
Revolving Loans 71,273   73,126
Financing Receivable, before Allowance for Credit Loss 556,786   429,394
Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 4,354 [1]   6,597
2024 1,099 [1]   6,607
2023 21,035 [1]   19,743
2022 18,940 [1]   342
2021 237 [1]   76
Prior 9,037 [1]   8,891
Revolving Loans 4,190 [1]   4,658
Financing Receivable, before Allowance for Credit Loss 58,892 [1]   46,914
Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 958   8,193
2024 7,572   29,304
2023 32,637   19,368
2022 52,704   65,314
2021 53,930   4,144
Prior 20,672   18,180
Revolving Loans 3,097   3,322
Financing Receivable, before Allowance for Credit Loss     147,825
Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior 0   0
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss 0   0
Substandard Nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss 171,570    
Commercial real estate - owner occupied      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 270,827   780,700
2024 792,843   781,372
2023 792,174   1,079,445
2022 1,066,533   789,220
2021 768,312   444,307
Prior 833,052   446,464
Revolving Loans 70,635   67,023
Charged-off loans (173) (94)  
Financing Receivable, before Allowance for Credit Loss 4,594,376   4,388,531
Commercial real estate - owner occupied | 2024      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (111)    
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 | Prior      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (62)    
Commercial real estate - owner occupied | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Commercial real estate - owner occupied | 2025      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Commercial real estate - owner occupied | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 270,827   759,519
2024 778,636   771,996
2023 770,986   1,064,314
2022 1,043,020   784,688
2021 762,808   432,886
Prior 812,956   439,607
Revolving Loans 70,635   67,023
Financing Receivable, before Allowance for Credit Loss 4,509,868   4,320,033
Commercial real estate - owner occupied | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   16,638
2024 10,256   0
2023 12,279   14,231
2022 22,041   3,192
2021 4,193   9,582
Prior 16,044   5,032
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss 64,813   48,675
Commercial real estate - owner occupied | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 [1]   599
2024 0 [1]   3,983
2023 3,953 [1]   900
2022 897 [1]   337
2021 160 [1]   59
Prior 197 [1]   198
Revolving Loans 0 [1]   0
Financing Receivable, before Allowance for Credit Loss 5,207 [1]   6,076
Commercial real estate - owner occupied | Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   3,944
2024 3,951   5,393
2023 4,956   0
2022 575   1,003
2021 1,151   1,780
Prior 3,855   1,627
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss     13,747
Commercial real estate - owner occupied | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior 0   0
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss 0   0
Commercial real estate - owner occupied | Substandard Nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss 14,488    
Commercial real estate - non-owner occupied      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 445,318   1,279,066
2024 1,155,377   867,374
2023 843,986   3,072,258
2022 3,272,003   1,858,013
2021 1,675,263   475,619
Prior 816,962   452,817
Revolving Loans 129,189   124,971
Charged-off loans 0 (2,000)  
Financing Receivable, before Allowance for Credit Loss 8,338,098   8,130,118
Commercial real estate - non-owner occupied | 2024      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 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 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 | 2025      
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]      
2025 445,318   1,273,096
2024 1,149,465   862,747
2023 838,286   3,040,361
2022 3,163,570   1,789,729
2021 1,579,816   474,094
Prior 803,024   449,924
Revolving Loans 128,755   124,971
Financing Receivable, before Allowance for Credit Loss 8,108,234   8,014,922
Commercial real estate - non-owner occupied | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   5,970
2024 5,912   0
2023 1,610   31,783
2022 73,967   29,828
2021 65,573   1,525
Prior 12,818   1,827
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss 159,880   70,933
Commercial real estate - non-owner occupied | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 [1]   0
2024 0 [1]   0
2023 0 [1]   0
2022 0 [1]   0
2021 0 [1]   0
Prior 0 [1]   0
Revolving Loans 0 [1]   0
Financing Receivable, before Allowance for Credit Loss 0 [1]   0
Commercial real estate - non-owner occupied | Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   0
2024 0   4,627
2023 4,090   114
2022 34,466   38,456
2021 29,874   0
Prior 1,120   1,066
Revolving Loans 434   0
Financing Receivable, before Allowance for Credit Loss     44,263
Commercial real estate - non-owner occupied | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior 0   0
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss 0   0
Commercial real estate - non-owner occupied | Substandard Nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss 69,984    
Consumer real estate – mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 173,874   398,076
2024 365,680   493,173
2023 480,060   886,036
2022 869,486   979,444
2021 958,562   399,585
Prior 805,828   443,552
Revolving Loans 1,323,868   1,314,616
Charged-off loans (450) (623)  
Financing Receivable, before Allowance for Credit Loss     4,914,482
Consumer real estate – mortgage | 2024      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Consumer real estate – mortgage | 2023      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (50)    
Consumer real estate – mortgage | 2022      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (29)    
Consumer real estate – mortgage | 2021      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (25)    
Consumer real estate – mortgage | Prior      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (40)    
Consumer real estate – mortgage | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (306)    
Consumer real estate – mortgage | 2025      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Consumer real estate – mortgage | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 173,764   397,681
2024 364,988   487,027
2023 473,240   879,118
2022 860,568   972,489
2021 943,317   397,775
Prior 791,731   428,832
Revolving Loans 1,322,635   1,312,971
Financing Receivable, before Allowance for Credit Loss     4,875,893
Consumer real estate – mortgage | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   0
2024 0   0
2023 0   0
2022 2,697   367
2021 10,458   0
Prior 0   0
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss     367
Consumer real estate – mortgage | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 [1]   0
2024 0 [1]   0
2023 0 [1]   0
2022 0 [1]   0
2021 0 [1]   0
Prior 0 [1]   0
Revolving Loans 0 [1]   0
Financing Receivable, before Allowance for Credit Loss     0
Consumer real estate – mortgage | Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 110   395
2024 692   6,146
2023 6,820   6,918
2022 6,221   6,588
2021 4,787   1,810
Prior 14,097   14,720
Revolving Loans 1,233   1,645
Financing Receivable, before Allowance for Credit Loss     38,222
Consumer real estate – mortgage | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior 0   0
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss     0
Construction and land development      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 277,615   1,055,831
2024 926,546   588,842
2023 561,875   1,589,567
2022 1,333,106   372,660
2021 330,313   7,415
Prior 13,963   7,992
Revolving Loans 82,442   77,014
Charged-off loans 0 0  
Financing Receivable, before Allowance for Credit Loss 3,525,860   3,699,321
Construction and land development | 2024      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 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 | 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 | 2025      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Construction and land development | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 269,220   1,052,892
2024 923,846   586,930
2023 559,236   1,589,567
2022 1,333,106   347,539
2021 262,128   7,415
Prior 13,963   7,992
Revolving Loans 82,436   77,014
Financing Receivable, before Allowance for Credit Loss 3,443,935   3,669,349
Construction and land development | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 8,395   2,464
2024 2,229   0
2023 858   0
2022 0   25,121
2021 68,185   0
Prior 0   0
Revolving Loans 6   0
Financing Receivable, before Allowance for Credit Loss 79,673   27,585
Construction and land development | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 [1]   0
2024 0 [1]   0
2023 0 [1]   0
2022 0 [1]   0
2021 0 [1]   0
Prior 0 [1]   0
Revolving Loans 0 [1]   0
Financing Receivable, before Allowance for Credit Loss 0 [1]   0
Construction and land development | Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   475
2024 471   1,912
2023 1,781   0
2022 0   0
2021 0   0
Prior 0   0
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss     2,387
Construction and land development | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior 0   0
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss 0   0
Construction and land development | Substandard Nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss 2,252    
Commercial and industrial      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 1,537,736   4,403,071
2024 3,660,766   1,991,044
2023 1,764,947   1,629,782
2022 1,464,187   804,118
2021 658,547   224,428
Prior 419,920   242,717
Revolving Loans 4,625,209   4,520,657
Charged-off loans (14,524) (14,808)  
Financing Receivable, before Allowance for Credit Loss 14,131,312   13,815,817
Commercial and industrial | 2024      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (1,818)    
Commercial and industrial | 2023      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (3,140)    
Commercial and industrial | 2022      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (3,290)    
Commercial and industrial | 2021      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (856)    
Commercial and industrial | Prior      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (346)    
Commercial and industrial | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (5,074)    
Commercial and industrial | 2025      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Commercial and industrial | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 1,518,057   4,334,110
2024 3,610,503   1,877,507
2023 1,667,177   1,553,642
2022 1,409,099   782,366
2021 626,476   223,143
Prior 408,601   232,580
Revolving Loans 4,548,322   4,441,222
Financing Receivable, before Allowance for Credit Loss 13,788,235   13,444,570
Commercial and industrial | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 14,990   60,125
2024 46,746   99,687
2023 65,882   44,986
2022 25,625   2,519
2021 13,876   714
Prior 879   677
Revolving Loans 71,267   73,126
Financing Receivable, before Allowance for Credit Loss 239,265   281,834
Commercial and industrial | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 4,354 [1]   5,998
2024 1,099 [1]   2,624
2023 17,082 [1]   18,843
2022 18,043 [1]   5
2021 77 [1]   17
Prior 8,840 [1]   8,693
Revolving Loans 4,190 [1]   4,658
Financing Receivable, before Allowance for Credit Loss 53,685 [1]   40,838
Commercial and industrial | Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 335   2,838
2024 2,418   11,226
2023 14,806   12,311
2022 11,420   19,228
2021 18,118   554
Prior 1,600   767
Revolving Loans 1,430   1,651
Financing Receivable, before Allowance for Credit Loss     48,575
Commercial and industrial | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior 0   0
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss 0   0
Commercial and industrial | Substandard Nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss 50,127    
Consumer and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 84,473   109,684
2024 38,128   26,333
2023 22,150   27,146
2022 24,203   43,310
2021 38,707   24,089
Prior 21,929   663
Revolving Loans 340,152   306,282
Charged-off loans (2,825) $ (3,307)  
Financing Receivable, before Allowance for Credit Loss 569,742   537,507
Consumer and other | 2024      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (55)    
Consumer and other | 2023      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (57)    
Consumer and other | 2022      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Consumer and other | 2021      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (1,040)    
Consumer and other | Prior      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (316)    
Consumer and other | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (1,357)    
Consumer and other | 2025      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Consumer and other | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 83,960   109,143
2024 38,088   26,333
2023 21,966   27,121
2022 24,181   43,271
2021 38,707   24,089
Prior 21,929   663
Revolving Loans 340,152   306,256
Financing Receivable, before Allowance for Credit Loss 568,983   536,876
Consumer and other | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior 0   0
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss 0   0
Consumer and other | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0 [1]   0
2024 0 [1]   0
2023 0 [1]   0
2022 0 [1]   0
2021 0 [1]   0
Prior 0 [1]   0
Revolving Loans 0 [1]   0
Financing Receivable, before Allowance for Credit Loss 0 [1]   0
Consumer and other | Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 513   541
2024 40   0
2023 184   25
2022 22   39
2021 0   0
Prior 0   0
Revolving Loans 0   26
Financing Receivable, before Allowance for Credit Loss     631
Consumer and other | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior 0   0
Revolving Loans 0   0
Financing Receivable, before Allowance for Credit Loss 0   0
Consumer and other | Substandard Nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss 759    
Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss 4,977,358   $ 4,914,482
Residential Mortgage | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss 4,930,243    
Residential Mortgage | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss 13,155    
Residential Mortgage | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss [1] 0    
Residential Mortgage | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss 0    
Residential Mortgage | Substandard Nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 33,960    
[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 $54.3 million at March 31, 2025, compared to $46.9 million at December 31, 2024.