v3.26.1
Investment Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More $ 314,712 $ 315,180
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,641,042 1,732,850
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 17,238 1,985
Twelve Months or More 415,057 420,004
Securities Available for Sale, Fair Value    
Less Than Twelve Months 2,228,430 665,711
Twelve Months or More 2,637,496 2,633,067
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 16,795 15,767
Securities Held to Maturity, Fair Value    
Twelve Months or More 116,120 117,146
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 175,475 177,101
Securities Held to Maturity, Fair Value    
Twelve Months or More 914,638 975,923
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 5,882 459
Twelve Months or More 138,873 137,848
Securities Available for Sale, Fair Value    
Less Than Twelve Months 694,570 145,357
Twelve Months or More 752,869 803,407
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 57,204 55,232
Securities Held to Maturity, Fair Value    
Twelve Months or More 306,721 323,874
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 5,713 46
Twelve Months or More 48,396 47,059
Securities Available for Sale, Fair Value    
Less Than Twelve Months 874,273 40,399
Twelve Months or More 258,069 278,620
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 57,188 58,332
Securities Held to Maturity, Fair Value    
Twelve Months or More 267,793 278,579
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 4,740 228
Twelve Months or More 74,602 73,814
Securities Available for Sale, Fair Value    
Less Than Twelve Months 462,508 152,299
Twelve Months or More 391,176 423,165
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 436 572
Twelve Months or More 127,914 134,645
Securities Available for Sale, Fair Value    
Less Than Twelve Months 61,086 43,620
Twelve Months or More 864,249 903,784
Small Business Administration loan-backed securities    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 8,050 8,748
Securities Held to Maturity, Fair Value    
Twelve Months or More 35,770 37,328
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 403 680
Twelve Months or More 24,442 25,408
Securities Available for Sale, Fair Value    
Less Than Twelve Months 126,057 284,036
Twelve Months or More 358,963 202,322
Corporate securities    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 64  
Twelve Months or More 830 1,230
Securities Available for Sale, Fair Value    
Less Than Twelve Months 9,936  
Twelve Months or More $ 12,170 $ 21,769