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Equity method investment (Details) - USD ($) $ in Thousands				12 Months Ended
		Mar. 01, 2016	Feb. 01, 2015	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Core deposits and other intangible assets				$ 27,465	$ 34,555
Amortization of intangibles				7,090	7,810	$ 8,518
Dividends received from equity method investment				36,694	63,114	69,996
Loans				32,676,091	29,041,605
Accounting Standards Update 2016-13
Schedule of Equity Method Investments [Line Items]
Cumulative effect of change in accounting principle	[1]			(35,002)
Cumulative effect of change in accounting principle	[1]			(35,002)
Bankers Healthcare Group, LLC | Accounting Standards Update 2016-13
Schedule of Equity Method Investments [Line Items]
Cumulative effect of change in accounting principle				35,000
Cumulative effect of change in accounting principle				35,000
Bankers Healthcare Group, LLC | Accounting Standards Update 2016-13
Schedule of Equity Method Investments [Line Items]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)				95,200
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)				$ 95,200
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				$ 6,000	6,300
Amortization of intangibles				349	512	752
Accretion income				225	718	1,500
Accretable discount				200	500
Dividends received from equity method investment				36,700	63,100	70,000
Commercial loans held for sale sold				1,400,000	1,000,000	646,600
Payments to Acquire Loans Held-for-investment				0	125,600	$ 276,700
Loans				263,000	$ 350,600
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				$ 69,400
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, 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%
[1] Represents the impact of Banker's Healthcare Group's adoption of ASU 2016-13. See Note 2. Equity Method Investment.

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