Commitments and Contingencies (Outstanding Financial Instruments Contract Amounts Represent Credit Risk) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	$ 11,671,663	$ 7,152,331
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	380,655	224,061
Letter of Credit [Member]
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	53,512	58,175
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	$ 11,237,496	$ 6,870,095