Summary of Significant Accounting Policies - Narrative (Details)			12 Months Ended
	Nov. 30, 2020 USD ($)	Nov. 30, 2019 USD ($)	Dec. 31, 2021 USD ($) subsidiary entity reporting_unit	Dec. 31, 2020 USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of wholly owned subsidiaries | subsidiary			5
Percentage of outstanding common stock of investees accounted for using equity method of accounting			100.00%
Number of entities non-banking activities | entity			6
Goodwill			$ 373,424,000	$ 373,424,000
Prior period reclassification adjustment			$ 0
Period for satisfactory payment of TDRs			6 months
Threshold for evaluation for expected credit loss of commercial loans			$ 1,000,000
Number of reporting units | reporting_unit			1
Number of wholly owned trust subsidiaries | subsidiary			3
Minimum | Core Deposits And Customers Lists
Summary of Significant Accounting Policies [Line Items]
Weighted average estimated useful of acquired intangibles			10 years
Maximum
Summary of Significant Accounting Policies [Line Items]
Amortization period of investments in joint ventures			10 years
Maximum | Core Deposits And Customers Lists
Summary of Significant Accounting Policies [Line Items]
Weighted average estimated useful of acquired intangibles			20 years
Corporate Joint Venture | Common Wealth Trust Life Insurance Company
Summary of Significant Accounting Policies [Line Items]
Percentage of outstanding common stock of investees accounted for using equity method of accounting			50.00%
Interest rate lock commitments
Summary of Significant Accounting Policies [Line Items]
Period for interest rate lock commitment			60 days
DNB
Summary of Significant Accounting Policies [Line Items]
Fair value of consideration	$ 200,991,000	$ 200,991,000
Total assets acquired		1,100,000,000
Loans acquired		909,000,000
Goodwill	85,978,000	84,175,000		$ 86,000,000
Deposits acquired	$ 967,265,000	$ 967,265,000