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Equity method investment (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 01, 2016 | Feb. 01, 2015 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Core deposits and other intangible assets |  |  | $ 42,336 | $ 51,130 |
Amortization of intangibles |  |  | 9,793 | 9,908 | $ 10,549
Dividends received from equity method investment |  |  | 53,020 | 51,312 | 33,651
Payments to Acquire Loans Held-for-investment |  |  | $ 100,000 |  |
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 |  |  | $ 7,600 | 8,800 |
Amortization of intangibles |  |  | 1,200 | 1,900 | 2,800
Accretion income |  |  | 2,100 | 2,600 | 2,900
Accretable discount |  |  | 2,700 | 4,800 |
Common stock issued (in shares) | 860,470 |  |  |  |
Common stock issued in the purchase agreement (value) | $ 39,900 |  |  |  |
Dividends received from equity method investment |  |  | 53,000 | 51,300 | 33,700
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 100,000 |  |
Proceeds from Lines of Credit |  |  | $ 0 |  |
Line of Credit Facility, Interest Rate Description |  |  | LIBOR plus 225 basis points |  |
Payments to Acquire Loans Receivable |  |  | $ 453,800 | $ 337,800 | $ 129,800
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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