New Accounting Standards (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unfunded commitments, allowance for credit loss	$ 41,900	$ 22,400
Undivided profits	$ 1,255,586	$ 1,093,270
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans			$ 151,400
Unfunded commitments, allowance for credit loss			24,000
Debt securities, allowance for credit loss			742
Undivided profits			$ 128,100