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Investment Securities - Summary of Securities Available for Sale (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Debt securities AFS:      
Amortized Cost   $ 2,018,391,000 $ 2,122,680,000
Gross Unrealized Gains   7,267,000 337,000
Gross Unrealized Losses   (192,576,000) (299,774,000)
Fair Value   1,833,082,000 1,823,243,000
Debt securities HTM:      
Amortized Cost   239,782,000 252,385,000
Gross Unrealized Gains   18,000 0
Gross Unrealized Losses   (12,776,000) (21,261,000)
Fair Value   227,024,000 231,124,000
Accrued interest receivable for investment securities available for sale   $ 8,300,000 $ 7,600,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]   Accrued interest receivable Accrued interest receivable
Unrealized gains on securities available for sale net of taxes   $ (148,307,000) $ (227,872,000)
Net gains on sales of securities available for sale $ (38,900,000) (37,700,000) 936,000
Available-for-sale Securities      
Debt securities HTM:      
Unrealized gains on securities available for sale net of taxes   (129,300,000) (210,500,000)
CMOs      
Debt securities AFS:      
Amortized Cost   706,528,000 861,179,000
Gross Unrealized Gains   1,116,000 152,000
Gross Unrealized Losses   (91,137,000) (139,425,000)
Fair Value   616,507,000 721,906,000
Residential      
Debt securities AFS:      
Amortized Cost   521,939,000 473,099,000
Gross Unrealized Gains   3,549,000 0
Gross Unrealized Losses   (48,105,000) (86,039,000)
Fair Value   477,383,000 387,060,000
Debt securities HTM:      
Amortized Cost   133,121,000 142,059,000
Gross Unrealized Gains   0 0
Gross Unrealized Losses   (7,358,000) (12,629,000)
Fair Value   125,763,000 129,430,000
Corporate securities      
Debt securities AFS:      
Amortized Cost   23,009,000 23,254,000
Gross Unrealized Gains   0 0
Gross Unrealized Losses   (1,873,000) (2,560,000)
Fair Value   21,136,000 20,694,000
Municipal securities      
Debt securities AFS:      
Amortized Cost   134,969,000 191,138,000
Gross Unrealized Gains   645,000 28,000
Gross Unrealized Losses   (8,300,000) (15,615,000)
Fair Value   127,314,000 175,551,000
Asset-backed securities      
Debt securities AFS:      
Amortized Cost   129,854,000 103,081,000
Gross Unrealized Gains   150,000 157,000
Gross Unrealized Losses   (4,000) (14,000)
Fair Value   130,000,000 103,224,000
Agency securities      
Debt securities AFS:      
Amortized Cost   0 4,000,000
Gross Unrealized Gains   0 0
Gross Unrealized Losses   0 (43,000)
Fair Value   0 3,957,000
Commercial      
Debt securities AFS:      
Amortized Cost   502,092,000 466,929,000
Gross Unrealized Gains   1,807,000 0
Gross Unrealized Losses   (43,157,000) (56,078,000)
Fair Value   460,742,000 410,851,000
Debt securities HTM:      
Amortized Cost   106,661,000 110,326,000
Gross Unrealized Gains   18,000 0
Gross Unrealized Losses   (5,418,000) (8,632,000)
Fair Value   $ 101,261,000 $ 101,694,000