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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Certain Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks $ 199,922 $ 202,427
Interest-earning deposits in financial institutions 2,885,306 5,175,149
Securities available-for-sale, Carrying Amount 2,286,682 2,346,864
Investment in FHLB stock, Carrying Amount 129,314 126,346
Investment in FHLB stock, Fair Value 129,314 126,346
Loans Held-for-sale, Fair Value Disclosure 82,383 126,646
Loans held for sale 80,752 122,757
Securities held-to-maturity, at amortized cost, net of allowance for credit losses (fair value of $2,153,349 and $2,168,316, respectively) 2,291,984 [1] 2,287,291 [2]
Loans and leases, net [3] 25,181,519 25,208,000
Loans and leases held for investment, net 23,553,410 23,551,725
Servicing Asset 21,384 22,174
Equity Securities, FV-NI 1 1
Servicing rights 22,242 22,174
Demand, interest checking, money market, and savings deposits 22,706,213 23,768,896
Time deposits 6,186,194 6,632,873
Time deposits 6,260,651 6,732,246
Borrowings (including $123,824 and $123,116 at fair value, respectively) 2,139,498 2,911,322
Borrowings 2,135,757 2,908,527
Subordinated debt 937,717 936,599
Subordinated Debt Obligations, Fair Value Disclosure 850,984 851,625
Derivative Liability 7,337 10,549
Securities held to maturity, fair value 2,153,349 [1] 2,168,316 [2]
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively) 2,286,682 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 $2,153,349 and $2,168,316, respectively) 187,759 187,033
Securities held to maturity, fair value 172,338 175,579
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks 199,922 202,427
Interest-earning deposits in financial institutions 2,885,306 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 129,314 126,346
Loans Held-for-sale, Fair Value Disclosure 82,383 126,646
Demand, interest checking, money market, and savings deposits 22,706,213 23,768,896
Time deposits 6,260,651 6,732,246
Borrowings 2,011,933 2,785,411
Subordinated Debt Obligations, Fair Value Disclosure 850,984 851,625
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 23,550,808 23,547,674
Equity warrants   3,689
Demand, interest checking, money market, and savings deposits 0 0
Time deposits 0 0
Borrowings 123,824 123,116
Subordinated Debt Obligations, Fair Value Disclosure 0 0
Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity warrants 3,708 3,689
Other derivative assets, Fair Value 10,205 8,309
Derivative liabilities 7,337 10,549
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively) 2,286,682  
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 172,338  
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 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 10,205 8,309
Equity Securities, FV-NI 0 0
Servicing rights 0 0
Derivative liabilities 7,337 10,549
Securities held to maturity, fair value 1,963,818 1,976,015
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively) 2,284,582 2,301,647
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity warrants 3,708 3,689
Other derivative assets, Fair Value 0 0
Equity Securities, FV-NI 0 0
Servicing rights 22,242 22,174
Derivative liabilities 0 0
Securities held to maturity, fair value 17,193 16,722
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively) 2,100 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 $ 2,602 $ 4,051
[1] Excludes accrued interest receivable of $11.3 million at March 31, 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 $109.3 million and $111.3 million at March 31, 2024 and December 31, 2023, respectively, which is recorded in "Other assets" on the condensed consolidated balance sheets.