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Equity method investment (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 01, 2016 | Feb. 01, 2015 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Core deposits and other intangible assets |  |  | $ 34,555 | $ 33,819 |
Amortization of intangibles |  |  | 7,810 | 8,518 | $ 9,793
Dividends received from equity method investment |  |  | 63,114 | 69,996 | 53,020
Loans |  |  | $ 29,041,605 | 23,414,262 |
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 |  |  | $ 6,300 | 6,800 |
Amortization of intangibles |  |  | 512 | 752 | 1,200
Accretion income |  |  | 718 | 1,500 | 2,100
Accretable discount |  |  | 500 | 1,200 |
Dividends received from equity method investment |  |  | 63,100 | 70,000 | 53,000
Commercial loans held for sale sold |  |  | 1,000,000 | 646,600 | 453,800
Payments to Acquire Loans Held-for-investment |  |  | 125,600 | 276,700 | $ 100,000
Loans |  |  | 350,600 | $ 319,100 |
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 |  |  | $ 88,300 |  |
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, Maximum Borrowing Capacity |  |  | $ 30,000 |  |
Proceeds from Lines of Credit |  |  | $ 10,000 |  |
Line of Credit Facility, Interest Rate Description |  |  | SOFR plus 200 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% |  |  |  |

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