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Fair Value of Financial Instruments, Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Financial assets [Abstract]    
Securities held-to-maturity, fair value $ 2,775,184 $ 2,744,946
Securities Purchased under Agreements to Resell 558,009 513,276
Quoted Market Prices in an Active Market (Level 1)    
Financial assets [Abstract]    
Securities held-to-maturity, fair value 0 0
Loans Receivable, Fair Value Disclosure 0 0
Consumer loans held-for-sale 0 0
Commercial loans held-for-sale 0 0
Securities Purchased under Agreements to Resell 0 0
Financial liabilities [Abstract]    
Deposits and securities sold under agreements to repurchase, fair value disclosure 0 0
Federal Home Loan Bank advances 0 0
Subordinated debt and other borrowings 0 0
Models with Significant Observable Market Parameters (Level 2)    
Financial assets [Abstract]    
Securities held-to-maturity, fair value 2,775,184 2,744,946
Loans Receivable, Fair Value Disclosure 0 0
Consumer loans held-for-sale 104,626 42,353
Commercial loans held-for-sale 9,316 21,151
Securities Purchased under Agreements to Resell 0 0
Financial liabilities [Abstract]    
Deposits and securities sold under agreements to repurchase, fair value disclosure 0 0
Federal Home Loan Bank advances 0 0
Subordinated debt and other borrowings 0 0
Models with Significant Unobservable Market Parameters (Level 3)    
Financial assets [Abstract]    
Securities held-to-maturity, fair value 0 0
Loans Receivable, Fair Value Disclosure 31,863,583 27,901,662
Consumer loans held-for-sale 0 0
Commercial loans held-for-sale 0 0
Securities Purchased under Agreements to Resell 461,375 440,390
Financial liabilities [Abstract]    
Deposits and securities sold under agreements to repurchase, fair value disclosure 37,954,938 34,435,447
Federal Home Loan Bank advances 2,166,912 477,673
Subordinated debt and other borrowings 462,399 430,884
Reported Value Measurement [Member]    
Financial assets [Abstract]    
Securities held-to-maturity, fair value 3,006,357 3,079,050
Loans Receivable, Fair Value Disclosure 32,323,036 28,740,940
Consumer loans held-for-sale 104,217 42,237
Commercial loans held-for-sale 9,280 21,093
Securities Purchased under Agreements to Resell 558,009 513,276
Financial liabilities [Abstract]    
Deposits and securities sold under agreements to repurchase, fair value disclosure 38,749,299 35,156,148
Federal Home Loan Bank advances 2,138,169 464,436
Subordinated debt and other borrowings 424,938 424,055
Estimate of Fair Value Measurement [Member]    
Financial assets [Abstract]    
Securities held-to-maturity, fair value [1] 2,775,184 2,744,946
Loans Receivable, Fair Value Disclosure [1] 31,863,583 27,901,662
Consumer loans held-for-sale [1] 104,626 42,353
Commercial loans held-for-sale [1] 9,316 21,151
Securities Purchased under Agreements to Resell 461,375 [1] 440,390
Financial liabilities [Abstract]    
Deposits and securities sold under agreements to repurchase, fair value disclosure [1] 37,954,938 34,435,447
Federal Home Loan Bank advances [1] 2,166,912 477,673
Subordinated debt and other borrowings [1] $ 462,399 $ 430,884
[1] Estimated fair values are consistent with an exit-price concept. The assumptions used to estimate the fair values are intended to approximate those that a market-participant would realize in a hypothetical orderly transaction.