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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Certain Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks $ 205,364 $ 192,006
Interest-earning deposits in financial institutions 2,192,901 2,310,206
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) 2,426,734 2,246,839
Securities available-for-sale, Carrying Amount 2,426,734 2,246,839
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) 2,303,657 [1] 2,306,149 [2]
Securities held to maturity, fair value 2,223,622 [1] 2,156,694 [2]
Investment in FHLB stock, Carrying Amount 159,337 147,773
Investment in FHLB stock, Fair Value 159,337 147,773
Loans held for sale 211,454 26,331
Loans Held-for-sale, Fair Value Disclosure 211,613 26,562
Loans and leases held for investment, net 22,968,320 22,412,073
Equity Securities, FV-NI 3 3
Servicing Asset 17,998 19,623
Servicing rights 19,818 21,040
Demand, interest checking, money market, and savings deposits 22,458,245 22,625,485
Time deposits 4,726,520 4,566,424
Time deposits 4,721,428 4,556,575
Borrowings (including $115,022 and $118,838 at fair value, respectively) 2,005,022 1,391,814
Borrowings 2,008,135 1,382,742
Subordinated debt 950,888 941,923
Subordinated Debt Obligations, Fair Value Disclosure 934,793 901,532
Derivative Liability 4,343 7,562
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks 205,364 192,006
Interest-earning deposits in financial institutions 2,192,901 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 190,000 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 159,337 147,773
Loans Held-for-sale, Fair Value Disclosure 211,613 26,562
Demand, interest checking, money market, and savings deposits 22,458,245 22,625,485
Time deposits 4,721,428 4,556,575
Borrowings 1,703,113 1,263,904
Subordinated Debt Obligations, Fair Value Disclosure 934,793 901,532
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 22,952,072 22,366,111
Equity warrants   3,763
Demand, interest checking, money market, and savings deposits 0 0
Time deposits 0 0
Borrowings 115,022 118,838
Subordinated Debt Obligations, Fair Value Disclosure 0 0
Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) 2,426,734  
Equity warrants 3,418 [3] 3,763
Cash flow hedges in Cash, Fair Value Disclosure, Liabilities [3] 4,394 1,442
Other derivative assets, Fair Value 4,396 [3] 7,031
Interest rate and foreign exchange contracts 4,343 [3] 7,562
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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
Securities held to maturity, fair value 183,536 173,283
Equity Securities, FV-NI 3 3
Equity warrants 0 [3] 0
Cash flow hedges in Cash, Fair Value Disclosure, Liabilities [3] 0 0
Other derivative assets, Fair Value 0 [3] 0
Servicing rights 0 0
Interest rate and foreign exchange contracts 0 [3] 0
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) 2,424,409 2,244,709
Securities held to maturity, fair value 2,036,210 1,976,265
Equity Securities, FV-NI 0 0
Equity warrants 0 [3] 0
Cash flow hedges in Cash, Fair Value Disclosure, Liabilities [3] 4,394 1,442
Other derivative assets, Fair Value 4,396 [3] 7,031
Servicing rights 0 0
Interest rate and foreign exchange contracts 4,343 [3] 7,562
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) 2,325 2,130
Securities held to maturity, fair value 3,876 7,146
Equity Securities, FV-NI 0 0
Equity warrants 3,418 [3] 3,763
Cash flow hedges in Cash, Fair Value Disclosure, Liabilities 0 0
Other derivative assets, Fair Value 0 [3] 0
Servicing rights 19,818 21,040
Interest rate and foreign exchange contracts 0 [3] 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 $ 16,248 $ 45,962
[1] Excludes accrued interest receivable of $11.2 million at September 30, 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