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Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More $ 323,111 $ 315,180
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,684,138 1,732,850
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 14,339 1,985
Twelve Months or More 441,570 420,004
Securities Available for Sale, Fair Value    
Less Than Twelve Months 1,669,898 665,711
Twelve Months or More 2,553,189 2,633,067
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 16,892 15,767
Securities Held to Maturity, Fair Value    
Twelve Months or More 116,022 117,146
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 181,274 177,101
Securities Held to Maturity, Fair Value    
Twelve Months or More 942,578 975,923
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 4,751 459
Twelve Months or More 142,770 137,848
Securities Available for Sale, Fair Value    
Less Than Twelve Months 563,659 145,357
Twelve Months or More 774,259 803,407
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 58,553 55,232
Securities Held to Maturity, Fair Value    
Twelve Months or More 313,553 323,874
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 3,122 46
Twelve Months or More 49,755 47,059
Securities Available for Sale, Fair Value    
Less Than Twelve Months 413,837 40,399
Twelve Months or More 267,423 278,620
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 58,228 58,332
Securities Held to Maturity, Fair Value    
Twelve Months or More 274,391 278,579
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 3,447 228
Twelve Months or More 75,197 73,814
Securities Available for Sale, Fair Value    
Less Than Twelve Months 391,493 152,299
Twelve Months or More 395,381 423,165
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2,715 572
Twelve Months or More 148,308 134,645
Securities Available for Sale, Fair Value    
Less Than Twelve Months 131,282 43,620
Twelve Months or More 855,726 903,784
Small Business Administration loan-backed securities    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 8,164 8,748
Securities Held to Maturity, Fair Value    
Twelve Months or More 37,594 37,328
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 302 680
Twelve Months or More 24,246 25,408
Securities Available for Sale, Fair Value    
Less Than Twelve Months 159,630 284,036
Twelve Months or More 248,694 202,322
Corporate securities    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2  
Twelve Months or More 1,294 1,230
Securities Available for Sale, Fair Value    
Less Than Twelve Months 9,997  
Twelve Months or More $ 11,706 $ 21,769