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Equity method investment (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 01, 2016 USD ($) shares | Feb. 01, 2015 USD ($) Rate | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 01, 2016 USD ($) | Mar. 01, 2016 Rate
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Core deposits and other intangible assets |  |  | $ 46,161,000 | $ 56,710,000 |  |  |
Amortization of intangibles |  |  | 10,549,000 | 8,816,000 | $ 4,281,000 |  |
Dividends received from equity method investment |  |  | $ 33,651,000 | 21,650,000 | $ 28,982,000 |  |
Bankers Healthcare Group, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 49.00% |  |  |  |
Payments to Acquire Businesses, Gross | $ 74,100,000 |  |  |  |  |  |
Additional ownership percentage | 19.00% |  |  |  |  |  | 19.00%
Common stock issued in the purchase agreement (in shares) | shares | 860,470 |  |  |  |  |  |
Common stock issued in the purchase agreement (value) |  |  |  |  |  | $ 39,900,000 |
Number of board of managers designated by bank | 2 |  |  |  |  |  |
Number of board managers | 5 |  |  |  |  |  |
Period of inability of members to transfer of ownership interest | 5 years |  |  |  |  |  |
Core deposits and other intangible assets |  |  | $ 10,700,000 | 13,400,000 |  |  |
Amortization of intangibles |  |  | 2,800,000 | 3,300,000 |  |  |
Accretion income |  |  | 2,900,000 | 3,100,000 |  |  |
Accretable discount |  |  | 7,400,000 | 10,300,000 |  |  |
Dividends received from equity method investment |  |  | $ 33,700,000 | $ 21,700,000 |  |  |
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 | Rate |  | 30.00% |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 75,000,000 |  |  |  |  |
Additional ownership percentage | Rate |  |  |  |  |  |  | 10.45%

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