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Fair Value Measurements - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments $ 2,855,893 $ 10,472,084
Securities available for sale 7,128,277 11,976,514
Total held to maturity securities 5,837,706 1,480,416
Trading securities 14,390 31,875
Other securities 333,732 327,098
Loans, exclusive of allowance for credit losses 19,886,443 17,172,148
Derivatives 50,470 57,680
Demand and savings deposits 30,936,421 34,748,286
Time deposits 869,967 851,641
Other borrowings 2,314,168 3,238,435
Long-term debt 381,543 271,544
Derivatives 131,294 13,944
Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments 2,855,893 10,472,084
Securities available for sale 7,128,277 11,976,514
Total held to maturity securities 5,079,806 1,442,391
Trading securities 14,390 31,875
Other securities 333,732 327,098
Loans, exclusive of allowance for credit losses 19,516,058 17,506,662
Derivatives 50,470 57,680
Demand and savings deposits 30,936,421 34,748,286
Time deposits 869,967 851,641
Other borrowings 2,314,168 3,238,435
Long-term debt 420,467 285,961
Derivatives 131,294 13,944
Commitments to extend credit for loans 6,346 7,841
Commercial letters of credit 152 179
Standby letters of credit 3,017 3,553
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments 2,148,354 9,255,727
Securities available for sale 1,102,763 387,020
Trading securities 6,110 5,985
Other securities 28,182 64,149
Demand and savings deposits 30,936,421 34,748,286
Other borrowings 54,440 12,597
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments 707,539 1,216,357
Securities available for sale 6,025,514 11,589,494
Total held to maturity securities 5,079,806 1,442,391
Trading securities 8,280 25,890
Other securities 305,550 262,949
Loans, exclusive of allowance for credit losses 19,516,058 17,506,662
Derivatives 50,470 57,680
Time deposits 869,967 851,641
Other borrowings 2,259,728 3,225,838
Long-term debt 420,467 285,961
Derivatives $ 131,294 $ 13,944