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Fair Value of Financial Instruments, Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Financial assets [Abstract]    
Securities held-to-maturity, fair value $ 2,560,252 $ 2,775,184
Securities Purchased under Agreements to Resell 66,449 558,009
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 2,560,252 2,775,184
Loans Receivable, Fair Value Disclosure 0 0
Consumer loans held-for-sale 175,838 104,626
Commercial loans held-for-sale 19,724 9,316
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 34,440,683 31,863,583
Consumer loans held-for-sale 0 0
Commercial loans held-for-sale 0 0
Securities Purchased under Agreements to Resell 66,451 461,375
Financial liabilities [Abstract]    
Deposits and securities sold under agreements to repurchase, fair value disclosure 42,190,235 37,954,938
Federal Home Loan Bank advances 1,874,588 2,166,912
Subordinated debt and other borrowings 431,996 462,399
Reported Value Measurement [Member]    
Financial assets [Abstract]    
Securities held-to-maturity, fair value 2,798,899 3,006,357
Loans Receivable, Fair Value Disclosure 35,071,282 32,323,036
Consumer loans held-for-sale 175,627 104,217
Commercial loans held-for-sale 19,700 9,280
Securities Purchased under Agreements to Resell 66,449 558,009
Financial liabilities [Abstract]    
Deposits and securities sold under agreements to repurchase, fair value disclosure 43,073,236 38,749,299
Federal Home Loan Bank advances 1,874,134 2,138,169
Subordinated debt and other borrowings 425,821 424,938
Estimate of Fair Value Measurement [Member]    
Financial assets [Abstract]    
Securities held-to-maturity, fair value [1] 2,560,252 2,775,184
Loans Receivable, Fair Value Disclosure [1] 34,440,683 31,863,583
Consumer loans held-for-sale [1] 175,838 104,626
Commercial loans held-for-sale [1] 19,724 9,316
Securities Purchased under Agreements to Resell 66,451 [1] 461,375
Financial liabilities [Abstract]    
Deposits and securities sold under agreements to repurchase, fair value disclosure [1] 42,190,235 37,954,938
Federal Home Loan Bank advances [1] 1,874,588 2,166,912
Subordinated debt and other borrowings [1] $ 431,996 $ 462,399
[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.