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Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Financial assets:    
Securities purchased with agreement to resell $ 66,480 $ 558,009
Securities held-to-maturity 2,713,901 2,775,184
Quoted market prices in an active market (Level 1)    
Financial assets:    
Securities purchased with agreement to resell 0 0
Securities held-to-maturity 0 0
Loans, net 0 0
Consumer loans held-for-sale 0 0
Commercial loans held-for-sale 0 0
Financial liabilities:    
Deposits and securities sold under agreements to repurchase 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:    
Securities purchased with agreement to resell 0 0
Securities held-to-maturity 2,713,901 2,775,184
Loans, net 0 0
Consumer loans held-for-sale 179,257 104,626
Commercial loans held-for-sale 8,649 9,316
Financial liabilities:    
Deposits and securities sold under agreements to repurchase 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:    
Securities purchased with agreement to resell 66,483 461,375
Securities held-to-maturity 0 0
Loans, net 33,484,235 31,863,583
Consumer loans held-for-sale 0 0
Commercial loans held-for-sale 0 0
Financial liabilities:    
Deposits and securities sold under agreements to repurchase 40,320,965 37,954,938
Federal Home Loan Bank advances 2,187,199 2,166,912
Subordinated debt and other borrowings 430,367 462,399
Carrying Amount    
Financial assets:    
Securities purchased with agreement to resell 66,480 558,009
Securities held-to-maturity 2,902,253 3,006,357
Loans, net 33,916,776 32,323,036
Consumer loans held-for-sale 178,600 104,217
Commercial loans held-for-sale 8,617 9,280
Financial liabilities:    
Deposits and securities sold under agreements to repurchase 41,164,844 38,749,299
Federal Home Loan Bank advances 2,146,395 2,138,169
Subordinated debt and other borrowings 425,600 424,938
Estimated Fair Value    
Financial assets:    
Securities purchased with agreement to resell 66,483 [1] 461,375
Securities held-to-maturity [1] 2,713,901 2,775,184
Loans, net [1] 33,484,235 31,863,583
Consumer loans held-for-sale [1] 179,257 104,626
Commercial loans held-for-sale [1] 8,649 9,316
Financial liabilities:    
Deposits and securities sold under agreements to repurchase [1] 40,320,965 37,954,938
Federal Home Loan Bank advances [1] 2,187,199 2,166,912
Subordinated debt and other borrowings [1] $ 430,367 $ 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.