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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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