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Loans - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) loan	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($) loan	Dec. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium)		$ 4,100		$ 16,100
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available		2,700,000		2,500,000
Financing Receivable, Paycheck Protection Program		446,400		709,900
Financing Receivable, Paycheck Protection Program, Net of Deferred Fees		439,000		698,600
Financing Receivable, Paycheck Protection Program, Unearned Fees		7,400		11,300
Nonperforming loan balances, excluding government guaranteed balances				5,400
Other Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable		31,600		31,100
Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post-Modification Outstanding Recorded Balance	$ 3,933		$ 7,819
Financing Receivable, Modifications, Number of Contracts | loan	3		6
Restructured, accruing		2,947		3,559
Loans, before unearned loan fees		9,126,796		7,241,074
Financing receivable, allowance for credit loss	$ 123,270	152,096	$ 123,270	136,671	$ 128,185	$ 110,270	$ 69,995	$ 43,288
Nonperforming loan balances, excluding government guaranteed balances		5,100
Non-Covered Loans | Enterprise Value Lending Portfolio Niche Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss		17,200
Non-Covered Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured, accruing		0		0
Loans, before unearned loan fees		270,037		187,083
Financing receivable, allowance for credit loss	$ 2,008	5,566	$ 2,008	$ 2,787	$ 6,958	$ 1,729	$ 1,050	$ 1,134
Non-Covered Loans | Agriculture Portfolio Niche Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss		19,000
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss		$ 18,300

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