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Securities - Schedule of Debt Securities, Available-for-Sale and Held-to-Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Debt securities available-for-sale:            
Amortized Cost $ 1,272,455   $ 847,272      
Gross Unrealized Gains 6,815   1,545      
Gross Unrealized Losses (17,690)   (21,317)      
Estimated Fair Value 1,261,580   827,500      
Allowance for Securities Credit Losses 0   0      
Total excluding fair value hedge basis adjustment 1,272,796          
Total excluding fair value hedge basis adjustment 6,815          
Total excluding fair value hedge basis adjustment (18,031)          
Total excluding fair value hedge basis adjustment 1,261,580          
Total excluding fair value hedge basis adjustment 0          
Fair value hedge basis adjustment, amortized cost (341)          
Fair value hedge basis adjustment, gross unrealized losses 341          
Debt securities held-to-maturity:            
Amortized Cost 920,702   1,046,842      
Gross Unrealized Gains 1,889   1,019      
Gross Unrealized Losses (66,041)   (94,944)      
Estimated Fair Value 856,550   952,917      
Allowance for Securities Credit Losses (968) $ (809) (967) $ (902) $ (958) $ (1,133)
Total, amortized cost 2,193,157   1,894,114      
Total, gross unrealized gains 8,704   2,564      
Total, gross unrealized losses (83,731)   (116,261)      
Total, estimated fair value 2,118,130   1,780,417      
U.S. government and agency obligations            
Debt securities available-for-sale:            
Amortized Cost 56,940   62,396      
Gross Unrealized Gains 2   11      
Gross Unrealized Losses (3,092)   (5,022)      
Estimated Fair Value 53,850   57,385      
Allowance for Securities Credit Losses 0   0      
State and municipal debt obligations            
Debt securities available-for-sale:            
Amortized Cost 75,357          
Gross Unrealized Gains 4,977          
Gross Unrealized Losses 0          
Estimated Fair Value 80,334          
Allowance for Securities Credit Losses 0          
Debt securities held-to-maturity:            
Amortized Cost 168,446   201,369      
Gross Unrealized Gains 295   199      
Gross Unrealized Losses (10,220)   (13,665)      
Estimated Fair Value 158,521   187,903      
Allowance for Securities Credit Losses (25)   (31)      
Corporate debt securities            
Debt securities available-for-sale:            
Amortized Cost 27,587   14,042      
Gross Unrealized Gains 502   43      
Gross Unrealized Losses (269)   (762)      
Estimated Fair Value 27,820   13,323      
Allowance for Securities Credit Losses 0   0      
Debt securities held-to-maturity:            
Amortized Cost 53,699   65,350      
Gross Unrealized Gains 148   775      
Gross Unrealized Losses (1,271)   (1,416)      
Estimated Fair Value 52,576   64,709      
Allowance for Securities Credit Losses (798)   (734)      
Asset-backed securities            
Debt securities available-for-sale:            
Amortized Cost 129,623   197,116      
Gross Unrealized Gains 195   235      
Gross Unrealized Losses (27)   (84)      
Estimated Fair Value 129,791   197,267      
Allowance for Securities Credit Losses 0   0      
Agency residential            
Debt securities available-for-sale:            
Amortized Cost 874,956   465,108      
Gross Unrealized Gains 1,139   1,256      
Gross Unrealized Losses (4,712)   (801)      
Estimated Fair Value 871,383   465,563      
Allowance for Securities Credit Losses 0   0      
Debt securities held-to-maturity:            
Amortized Cost 611,238   680,052      
Gross Unrealized Gains 1,438   44      
Gross Unrealized Losses (48,937)   (73,110)      
Estimated Fair Value 563,739   606,986      
Allowance for Securities Credit Losses 0   0      
Agency commercial            
Debt securities available-for-sale:            
Amortized Cost 108,333   108,610      
Gross Unrealized Gains 0   0      
Gross Unrealized Losses (9,931)   (14,648)      
Estimated Fair Value 98,402   93,962      
Allowance for Securities Credit Losses 0   0      
Debt securities held-to-maturity:            
Amortized Cost 78,304   79,925      
Gross Unrealized Gains 7   1      
Gross Unrealized Losses (5,383)   (5,878)      
Estimated Fair Value 72,928   74,048      
Allowance for Securities Credit Losses 0   0      
Non-agency commercial            
Debt securities held-to-maturity:            
Amortized Cost 9,015   20,146      
Gross Unrealized Gains 1   0      
Gross Unrealized Losses (230)   (875)      
Estimated Fair Value 8,786   19,271      
Allowance for Securities Credit Losses (145)   (202)      
Total mortgage-backed securities            
Debt securities available-for-sale:            
Amortized Cost 983,289   573,718      
Gross Unrealized Gains 1,139   1,256      
Gross Unrealized Losses (14,643)   (15,449)      
Estimated Fair Value 969,785   559,525      
Allowance for Securities Credit Losses 0   0      
Debt securities held-to-maturity:            
Amortized Cost 698,557   780,123      
Gross Unrealized Gains 1,446   45      
Gross Unrealized Losses (54,550)   (79,863)      
Estimated Fair Value 645,453   700,305      
Allowance for Securities Credit Losses $ (145)   $ (202)