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Loans and Allowance for Credit Losses (Schedule of Loans) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 23,933,527 |  | $ 24,297,980 |  |  |
Allowance for credit losses | (222,730) | $ (219,747) | (223,153) | $ (225,698) | $ (217,556) | $ (202,689)
Loans, net | $ 23,710,797 |  | $ 24,074,827 |  |  |
Percent of Total Loans | 100.00% |  | 100.00% |  |  |
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 16,629,530 |  | $ 16,717,166 |  |  |
Allowance for credit losses | $ (208,961) | (204,180) | $ (211,203) | (219,472) | (210,929) | (195,058)
Percent of Total Loans | 69.50% |  | 68.80% |  |  |
Residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 7,303,997 |  | $ 7,580,814 |  |  |
Allowance for credit losses | $ (13,769) | $ (15,567) | $ (11,950) | $ (6,226) | $ (6,627) | $ (7,631)
Percent of Total Loans | 30.50% |  | 31.20% |  |  |
Non-owner occupied commercial real estate | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 5,829,835 |  | $ 5,652,203 |  |  |
Percent of Total Loans | 24.40% |  | 23.30% |  |  |
Construction and land | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 643,630 |  | $ 561,989 |  |  |
Percent of Total Loans | 2.70% |  | 2.30% |  |  |
Owner occupied commercial real estate | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 1,942,076 |  | $ 1,941,004 |  |  |
Percent of Total Loans | 8.10% |  | 8.00% |  |  |
Commercial and industrial | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 6,743,739 |  | $ 7,042,222 |  |  |
Percent of Total Loans | 28.20% |  | 28.90% |  |  |
Pinnacle - municipal finance |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 694,639 |  | $ 720,661 |  |  |
Pinnacle - municipal finance | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 694,639 |  | $ 720,661 |  |  |
Percent of Total Loans | 2.90% |  | 3.00% |  |  |
Franchise and equipment finance |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 149,022 |  | $ 213,477 |  |  |
Franchise and equipment finance | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 149,022 |  | $ 213,477 |  |  |
Percent of Total Loans | 0.60% |  | 0.90% |  |  |
Mortgage warehouse lending |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 626,589 |  | $ 585,610 |  |  |
Mortgage warehouse lending | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 626,589 |  | $ 585,610 |  |  |
Percent of Total Loans | 2.60% |  | 2.40% |  |  |
1-4 single family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 6,310,932 |  | $ 6,508,922 |  |  |
1-4 single family residential | Residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 6,310,932 |  | $ 6,508,922 |  |  |
Percent of Total Loans | 26.40% |  | 26.80% |  |  |
Government insured residential | Residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 993,065 |  | $ 1,071,892 |  |  |
Percent of Total Loans | 4.10% |  | 4.40% |  |  |

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