Summary of Significant Accounting Policies - Additional Information (Details)	6 Months Ended		12 Months Ended
	Dec. 31, 2021 USD ($) derivativeInstument reportable_segment loan	Jun. 30, 2021 reportable_segment	Dec. 31, 2021 USD ($) derivativeInstument loan	Dec. 31, 2020 USD ($) derivativeInstument	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Outstanding balance of loans in deferral			$ 31,896,000	$ 104,597,000
Accrued interest income and fees on outstanding deferrals			124,000	726,000
Misdirected payments	$ 4,867,572,000		4,867,572,000	4,996,776,000
Accrued interest reversed			$ 0	0	$ 0
Number of days within which accrual of interest income discontinues			90 days
Period after which consumer loans are charged off			120 days
Interest income not recognized until loan balance reduced, amount			$ 0
Net reduction of retained earnings	(858,864,000)		(858,864,000)	(726,781,000)	(636,590,000)	$ (636,607,000)
ACL Allocation	42,213,000		42,213,000	95,739,000
Allowance for credit loss, debt securities, held to maturity	2,082,000		2,082,000	2,026,000	0	0
Deferred tax assets	$ 39,292,000		$ 39,292,000	38,361,000
Equipment loan term			60 months
Change in national retail sales forecast period			1 year
Change in national home price index forecast period			1 year
Change in national gross domestic product forecast period			1 year
Number of reportable segments | reportable_segment	4	3
Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Net reduction of retained earnings					1,770,000
ACL Allocation					269,000
Allowance for credit loss, debt securities, held to maturity				0	126,000	0
Credit loss, liability					1,918,000
Deferred tax assets					543,000
Retained Earnings
Summary Of Significant Accounting Policies [Line Items]
Net reduction of retained earnings	$ (399,351,000)		$ (399,351,000)	$ (289,583,000)	(229,030,000)	$ (170,486,000)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Net reduction of retained earnings					$ 1,770,000
Cash Flow Hedging
Summary Of Significant Accounting Policies [Line Items]
Number of instruments held | derivativeInstument	1		1	1
Fair Value Hedging
Summary Of Significant Accounting Policies [Line Items]
Number of instruments held | derivativeInstument	0		0	0
Automobiles
Summary Of Significant Accounting Policies [Line Items]
Useful life of assets			5 years
Aircraft
Summary Of Significant Accounting Policies [Line Items]
Useful life of assets			20 years
Paycheck Protection Program
Summary Of Significant Accounting Policies [Line Items]
Stated interest rate	1.00%		1.00%
Number of loans funded | loan	118		118
Misdirected payments	$ 27,197,000		$ 27,197,000
Proceeds and fees received			7,263,000	$ 4,570,000
Deferred fees on PPP loans	$ 841,000		$ 841,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Nonaccrual status term			90 days
Estimated useful lives			4 years
Minimum | Capitalized Software
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives			3 years
Minimum | Buildings
Summary Of Significant Accounting Policies [Line Items]
Useful life of assets			5 years
Minimum | Furniture, fixtures and equipment
Summary Of Significant Accounting Policies [Line Items]
Useful life of assets			3 years
Minimum | Paycheck Protection Program
Summary Of Significant Accounting Policies [Line Items]
Loan term			2 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives			11 years
Maximum | Capitalized Software
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives			5 years
Maximum | Buildings
Summary Of Significant Accounting Policies [Line Items]
Useful life of assets			40 years
Maximum | Furniture, fixtures and equipment
Summary Of Significant Accounting Policies [Line Items]
Useful life of assets			10 years
Maximum | Paycheck Protection Program
Summary Of Significant Accounting Policies [Line Items]
Loan term			5 years
One Customer | Payment Deferral Benchmark | Customer Concentration Risk
Summary Of Significant Accounting Policies [Line Items]
Percentage of loans			95.00%
Payment Deferrals
Summary Of Significant Accounting Policies [Line Items]
Outstanding balance of loans in deferral			$ 31,896,000
Accrued interest income and fees on outstanding deferrals			$ 124,000