Outstanding Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Credit Commitments and Contingencies
Total commitments	$ 1,999,155	$ 2,016,207
Commitments to extend credit
Credit Commitments and Contingencies
Total commitments	1,969,861	1,983,655
Standby letters of credit
Credit Commitments and Contingencies
Total commitments	$ 29,294	$ 32,552