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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Certain Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks $ 251,869 $ 202,427
Interest-earning deposits in financial institutions 2,302,358 5,175,149
Securities available-for-sale, Carrying Amount 2,300,284 2,346,864
Investment in FHLB stock, Carrying Amount 145,123 126,346
Investment in FHLB stock, Fair Value 145,123 126,346
Loans Held-for-sale, Fair Value Disclosure 29,355 126,646
Loans held for sale 28,639 122,757
Securities held-to-maturity, at amortized cost, net of allowance for credit losses (fair value of $2,145,929 and $2,168,316, respectively) 2,301,263 [1] 2,287,291 [2]
Loans and leases, net [3] 23,273,432 25,208,000
Loans and leases held for investment, net 22,198,131 23,551,725
Servicing Asset 20,102 22,174
Equity Securities, FV-NI 1 1
Servicing rights 20,661 22,174
Demand, interest checking, money market, and savings deposits 22,383,666 23,768,896
Time deposits 4,444,603 6,632,873
Time deposits 4,513,879 6,732,246
Borrowings (including $119,624 and $123,116 at fair value, respectively) 1,591,833 2,911,322
Borrowings 1,564,364 2,908,527
Subordinated debt 942,151 936,599
Subordinated Debt Obligations, Fair Value Disclosure 886,815 851,625
Derivative Liability 13,327 10,549
Securities held to maturity, fair value 2,229,482 [1] 2,168,316 [2]
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,613,901 and $2,699,255, respectively) 2,300,284 2,346,864
U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities held-to-maturity, at amortized cost, net of allowance for credit losses (fair value of $2,145,929 and $2,168,316, respectively) 189,239 187,033
Securities held to maturity, fair value 180,427 175,579
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks 251,869 202,427
Interest-earning deposits in financial institutions 2,302,358 5,175,149
Investment in FHLB stock, Fair Value 0 0
Loans Held-for-sale, Fair Value Disclosure 0 0
Demand, interest checking, money market, and savings deposits 0 0
Time deposits 0 0
Borrowings 0 0
Subordinated Debt Obligations, Fair Value Disclosure 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks 0 0
Interest-earning deposits in financial institutions 0 0
Investment in FHLB stock, Fair Value 145,123 126,346
Loans Held-for-sale, Fair Value Disclosure 29,355 126,646
Demand, interest checking, money market, and savings deposits 22,383,666 23,768,896
Time deposits 4,513,879 6,732,246
Borrowings 1,444,740 2,785,411
Subordinated Debt Obligations, Fair Value Disclosure 886,815 851,625
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks 0 0
Interest-earning deposits in financial institutions 0 0
Investment in FHLB stock, Fair Value 0 0
Loans Held-for-sale, Fair Value Disclosure 0 0
Loans and leases held for investment, net 22,163,927 23,547,674
Equity warrants   3,689
Demand, interest checking, money market, and savings deposits 0 0
Time deposits 0 0
Borrowings 119,624 123,116
Subordinated Debt Obligations, Fair Value Disclosure 0 0
Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity warrants 3,297 3,689
Other derivative assets, Fair Value 7,565 8,309
Derivative liabilities 13,327 10,549
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,613,901 and $2,699,255, respectively) 2,300,284  
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity warrants 0 0
Other derivative assets, Fair Value 0 0
Equity Securities, FV-NI 1 1
Servicing rights 0 0
Derivative liabilities 0 0
Securities held to maturity, fair value 180,427  
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,613,901 and $2,699,255, respectively) 0 4,968
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity warrants 0 0
Other derivative assets, Fair Value 7,565 8,309
Equity Securities, FV-NI 0 0
Servicing rights 0 0
Derivative liabilities 13,327 10,549
Securities held to maturity, fair value 2,045,576 1,976,015
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,613,901 and $2,699,255, respectively) 2,284,875 2,301,647
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity warrants 3,297 3,689
Other derivative assets, Fair Value 0 0
Equity Securities, FV-NI 0 0
Servicing rights 20,661 22,174
Derivative liabilities 0 0
Securities held to maturity, fair value 3,479 16,722
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,613,901 and $2,699,255, respectively) 15,409 40,249
NonPCI and PCI Loans | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans and leases held for investment, net 0 0
NonPCI and PCI Loans | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans and leases held for investment, net $ 34,204 $ 4,051
[1] Excludes accrued interest receivable of $11.3 million at September 30, 2024 which is recorded in "Other assets" on the condensed consolidated balance sheets
[2] Excludes accrued interest receivable of $13.4 million at December 31, 2023 which is recorded in "Other assets" on the condensed consolidated balance sheets
[3] Excludes accrued interest receivable of $99.0 million and $111.3 million at September 30, 2024 and December 31, 2023, respectively, which is recorded in "Other assets" on the condensed consolidated balance sheets.