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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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