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Equity method investment (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 01, 2016 | Feb. 01, 2015 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Core deposits and other intangible assets |  |  |  | $ 21,423 | $ 27,465 |
Amortization of intangibles |  |  |  | 6,254 | 7,090 | $ 7,810
Dividends received from equity method investment |  |  |  | 71,689 | 36,694 | 63,114
Payments to Acquire Loans Held-for-investment |  |  |  | 10,042 | 0 | 125,600
Cumulative effect of change in accounting principle | [1] |  |  |  | (35,002) |
Financing Receivable, before Allowance for Credit Loss |  |  |  | 35,485,776 | 32,676,091 |
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price |  |  |  | 24,157 |  |
Financing Receivable, Purchased with Credit Deterioration, Amount at Par Value |  |  |  | 10,042 |  |
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  |  |  | 14,115 |  |
Cumulative effect of change in accounting principle | [1] |  |  |  | (35,002) |
Bankers Healthcare Group, LLC | Accounting Standards Update 2016-13 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  | 35,000 |  |
Cumulative effect of change in accounting principle |  |  |  | 35,000 |  |
Bankers Healthcare Group, LLC | Accounting Standards Update 2016-13 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) |  |  |  | 95,200 |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) |  |  |  | $ 95,200 |  |
Bankers Healthcare Group, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 49.00% |  |
Payments to Acquire Businesses, Gross |  | $ 74,100 |  |  |  |
Additional ownership percentage |  | 19.00% |  |  |  |
Core deposits and other intangible assets |  |  |  | $ 5,700 | 6,000 |
Amortization of intangibles |  |  |  | 237 | 349 | 512
Accretion income |  |  |  | 139 | 225 | 718
Accretable discount |  |  |  | 100 | 200 |
Dividends received from equity method investment |  |  |  | 71,700 | 36,700 | 63,100
Commercial loans held for sale sold |  |  |  | 1,800,000 | 1,400,000 | 1,000,000
Payments to Acquire Loans Held-for-investment |  |  |  | 0 | 0 | $ 125,600
Financing Receivable, before Allowance for Credit Loss |  |  |  | 161,700 | $ 263,000 |
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price |  |  |  | 24,200 |  |
Financing Receivable, Purchased with Credit Deterioration, Amount at Par Value |  |  |  | 10,000 |  |
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  |  |  | 14,200 |  |
Proceeds from Sale, Loan, Held-for-Investment |  |  |  | 30,700 |  |
Bankers Healthcare Group, LLC | Loan #1 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 150,000 |  |
Proceeds from Lines of Credit |  |  |  | $ 82,800 |  |
Line of Credit Facility, Interest Rate Description |  |  |  | SOFR plus 200 basis points |  |
Bankers Healthcare Group, LLC | Loan #2 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Line of Credit Facility, Interest Rate Description |  |  |  | SOFR plus 200 basis points |  |
Bankers Healthcare Group, LLC | Loan #3 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 50,000 |  |
Proceeds from Lines of Credit |  |  |  | $ 0 |  |
Line of Credit Facility, Interest Rate Description |  |  |  | SOFR plus 300 basis points |  |
Bankers Healthcare Group, LLC | Bankers Healthcare Group, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Common stock issued (in shares) |  | 860,470 |  |  |  |
Common stock issued in the purchase agreement (value) |  | $ 39,900 |  |  |  |
Bankers Healthcare Group, LLC | Pinnacle Financial |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Additional ownership percentage |  | 8.55% |  |  |  |
Bankers Healthcare Group, LLC | Pinnacle Bank |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 30.00% |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 75,000 |  |  |
Additional ownership percentage |  | 10.45% |  |  |  |
[1] | Represents the impact of Banker's Healthcare Group's adoption of ASU 2016-13. See Note 2. Equity Method Investment.

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