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Securities - Schedule of Debt Securities, AFS and HTM (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Debt securities AFS:            
Amortized Cost $ 2,071,078   $ 1,234,036      
Gross Unrealized Gains 8,997   9,769      
Gross Unrealized Losses (12,407)   (11,978)      
Estimated Fair Value 2,067,668   1,231,827      
Allowance for Securities Credit Losses 0   0      
Total excluding fair value hedge basis adjustment, amortized cost 2,083,301   1,238,074      
Total excluding fair value hedge basis adjustment, gross unrealized gains 8,997   9,769      
Total excluding fair value hedge basis adjustment, gross unrealized losses (24,630)   (16,016)      
Total excluding fair value hedge basis adjustment, estimated fair value 2,067,668   1,231,827      
Total excluding fair value hedge basis adjustment, allowance for securities credit losses 0   0      
Fair value hedge basis adjustment, amortized cost (12,223)   (4,038)      
Fair value hedge basis adjustment, gross unrealized losses 12,223   4,038      
Debt securities HTM:            
Amortized Cost 2,862,859   882,379      
Gross Unrealized Gains 4,258   2,481      
Gross Unrealized Losses (63,651)   (59,070)      
Estimated Fair Value 2,803,466   825,790      
Allowance for Securities Credit Losses (663) $ (754) (811) $ (809) $ (898) $ (967)
Total, amortized cost 4,933,937   2,116,415      
Total, gross unrealized gains 13,255   12,250      
Total, gross unrealized losses (76,058)   (71,048)      
Total, estimated fair value 4,871,134   2,057,617      
Total mortgage-backed securities            
Debt securities AFS:            
Amortized Cost 1,287,523   965,149      
Gross Unrealized Gains 1,005   1,775      
Gross Unrealized Losses (21,771)   (12,891)      
Estimated Fair Value 1,266,757   954,033      
Allowance for Securities Credit Losses 0   0      
Debt securities HTM:            
Amortized Cost 2,666,778   668,126      
Gross Unrealized Gains 3,409   1,796      
Gross Unrealized Losses (56,098)   (49,860)      
Estimated Fair Value 2,614,089   620,062      
Allowance for Securities Credit Losses (12)   (17)      
U.S. government and agency obligations            
Debt securities AFS:            
Amortized Cost 54,631   54,607      
Gross Unrealized Gains 0   0      
Gross Unrealized Losses (2,544)   (2,666)      
Estimated Fair Value 52,087   51,941      
Allowance for Securities Credit Losses 0   0      
State and municipal debt obligations            
Debt securities AFS:            
Amortized Cost 135,335   75,776      
Gross Unrealized Gains 6,937   7,359      
Gross Unrealized Losses 0   0      
Estimated Fair Value 142,272   83,135      
Allowance for Securities Credit Losses 0   0      
Debt securities HTM:            
Amortized Cost 150,074   165,267      
Gross Unrealized Gains 622   434      
Gross Unrealized Losses (7,155)   (8,518)      
Estimated Fair Value 143,541   157,183      
Allowance for Securities Credit Losses (20)   (22)      
Corporate debt securities            
Debt securities AFS:            
Amortized Cost 144,760   27,947      
Gross Unrealized Gains 952   575      
Gross Unrealized Losses (158)   (298)      
Estimated Fair Value 145,554   28,224      
Allowance for Securities Credit Losses 0   0      
Debt securities HTM:            
Amortized Cost 46,007   48,986      
Gross Unrealized Gains 227   251      
Gross Unrealized Losses (398)   (692)      
Estimated Fair Value 45,836   48,545      
Allowance for Securities Credit Losses (631)   (772)      
Asset-backed securities            
Debt securities AFS:            
Amortized Cost 461,052   114,595      
Gross Unrealized Gains 103   60      
Gross Unrealized Losses (157)   (161)      
Estimated Fair Value 460,998   114,494      
Allowance for Securities Credit Losses 0   0      
Agency residential            
Debt securities AFS:            
Amortized Cost 1,179,978   857,079      
Gross Unrealized Gains 1,005   1,773      
Gross Unrealized Losses (12,322)   (3,830)      
Estimated Fair Value 1,168,661   855,022      
Allowance for Securities Credit Losses 0   0      
Debt securities HTM:            
Amortized Cost 2,520,815   589,078      
Gross Unrealized Gains 3,134   1,788      
Gross Unrealized Losses (49,788)   (44,521)      
Estimated Fair Value 2,474,161   546,345      
Allowance for Securities Credit Losses 0   0      
Agency commercial            
Debt securities AFS:            
Amortized Cost 107,545   108,070      
Gross Unrealized Gains 0   2      
Gross Unrealized Losses (9,449)   (9,061)      
Estimated Fair Value 98,096   99,011      
Allowance for Securities Credit Losses 0   0      
Debt securities HTM:            
Amortized Cost 144,905   77,517      
Gross Unrealized Gains 275   8      
Gross Unrealized Losses (6,227)   (5,256)      
Estimated Fair Value 138,953   72,269      
Allowance for Securities Credit Losses 0   0      
Non-agency commercial            
Debt securities HTM:            
Amortized Cost 1,058   1,531      
Gross Unrealized Gains 0   0      
Gross Unrealized Losses (83)   (83)      
Estimated Fair Value 975   1,448      
Allowance for Securities Credit Losses $ (12)   $ (17)