Loans and Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 30,297,871		$ 29,041,605
Percentage of loan portfolio as commercial loan	78.90%
Risk rated loans	$ 1,500
Percentage of credit exposure to risk based capital	25.00%
Loans and other extensions of credit granted to directors, executive officers, and their related entities	$ 21,000		20,900
Amount drawn from loans and other extensions of credit granted	16,700		16,000
Commercial loans held-for-sale	23,087		21,093
Mortgage loans held-for-sale	15,600		$ 12,900
Loans sold	120,100	$ 270,800
Gain (Loss) on Sale of Mortgage Loans	$ 2,053	$ 4,066
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of credit exposure to risk based capital	88.50%		85.90%
Non-owner occupied commercial real estate and multifamily loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of credit exposure to risk based capital	261.10%		249.60%