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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Certain Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks $ 215,591 $ 192,006
Interest-earning deposits in financial institutions 2,128,298 2,310,206
Securities available-for-sale, Carrying Amount 2,334,058 2,246,839
Investment in FHLB stock, Carrying Amount 155,330 147,773
Investment in FHLB stock, Fair Value 155,330 147,773
Loans Held-for-sale, Fair Value Disclosure 26,015 26,562
Loans held for sale 25,797 26,331
Securities held-to-maturity, at amortized cost, net of allowance for credit losses (fair value of $2,179,910 and $2,156,694, respectively)(ACL of $600 and $1,500, respectively) 2,311,912 [1] 2,306,149 [2]
Loans and leases held for investment, net 22,732,328 22,412,073
Servicing Asset 19,062 19,623
Equity Securities, FV-NI 2 3
Servicing rights 20,336 21,040
Demand, interest checking, money market, and savings deposits 22,707,851 22,625,485
Time deposits 4,485,340 4,566,424
Time deposits 4,477,629 4,556,575
Borrowings (including $117,196 and $118,838 at fair value, respectively) 1,670,782 1,391,814
Borrowings 1,670,940 1,382,742
Subordinated debt 944,908 941,923
Subordinated Debt Obligations, Fair Value Disclosure 915,685 901,532
Derivative Liability 5,480 7,562
Securities held to maturity, fair value 2,179,910 [1] 2,156,694 [2]
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) 2,334,058 2,246,839
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 $2,179,910 and $2,156,694, respectively)(ACL of $600 and $1,500, respectively) 190,726 189,985
Securities held to maturity, fair value 178,435 173,283
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks 215,591 192,006
Interest-earning deposits in financial institutions 2,128,298 2,310,206
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 100,000 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 155,330 147,773
Loans Held-for-sale, Fair Value Disclosure 26,015 26,562
Demand, interest checking, money market, and savings deposits 22,707,851 22,625,485
Time deposits 4,477,629 4,556,575
Borrowings 1,453,744 1,263,904
Subordinated Debt Obligations, Fair Value Disclosure 915,685 901,532
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 22,706,057 22,366,111
Equity warrants   3,763
Demand, interest checking, money market, and savings deposits 0 0
Time deposits 0 0
Borrowings 117,196 118,838
Subordinated Debt Obligations, Fair Value Disclosure 0 0
Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity warrants 3,497 [3] 3,763
Other derivative assets, Fair Value 5,877 [3] 7,031
Interest rate and foreign exchange contracts 5,480 [3] 7,562
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) 2,334,058  
Cash Flow Hedge Derivative Instrument Assets at Fair Value [3] 2,081 1,442
Cash flow hedges in Cash, Fair Value Disclosure, Liabilities [3] 2,081 1,442
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity warrants 0 [3] 0
Other derivative assets, Fair Value 0 [3] 0
Equity Securities, FV-NI 2 3
Servicing rights 0 0
Interest rate and foreign exchange contracts 0 [3] 0
Securities held to maturity, fair value 178,435  
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) 0 0
Cash Flow Hedge Derivative Instrument Assets at Fair Value [3] 0 0
Cash flow hedges in Cash, Fair Value Disclosure, Liabilities [3] 0 0
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity warrants 0 [3] 0
Other derivative assets, Fair Value 5,877 [3] 7,031
Equity Securities, FV-NI 0 0
Servicing rights 0 0
Interest rate and foreign exchange contracts 5,480 [3] 7,562
Securities held to maturity, fair value 1,997,862 1,976,265
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) 2,331,898 2,244,709
Cash Flow Hedge Derivative Instrument Assets at Fair Value [3] 2,081 1,442
Cash flow hedges in Cash, Fair Value Disclosure, Liabilities [3] 2,081 1,442
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity warrants 3,497 [3] 3,763
Other derivative assets, Fair Value 0 [3] 0
Equity Securities, FV-NI 0 0
Servicing rights 20,336 21,040
Interest rate and foreign exchange contracts 0 [3] 0
Securities held to maturity, fair value 3,613 7,146
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) 2,160 2,130
Cash Flow Hedge Derivative Instrument Assets at Fair Value [3] 0 0
Cash flow hedges in Cash, Fair Value Disclosure, Liabilities 0 0
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 $ 26,271 $ 45,962
[1] Excludes accrued interest receivable of $11.3 million at March 31, 2025 which is recorded in "Other assets" on the condensed consolidated balance sheets
[2] Excludes accrued interest receivable of $13.4 million at December 31, 2024 which is recorded in "Other assets" on the condensed consolidated balance sheets
[3] For information regarding derivative instruments, see Note 9. Derivatives