v3.26.1
Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Schedule of Held-to-maturity Securities [Line Items]    
Held to Maturity, Losses less than 12 months, Fair Value $ 52,053 $ 98,559
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses 260 97
Held to Maturity, Losses 12 months or longer, Fair Value 1,514,401 1,808,602
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses 129,798 122,715
Held To Maturity Securities Unrealized Loss Position Fair Value, Total 1,566,454 1,907,161
Held to Maturity, Total, Gross Unrealized Losses 130,058 122,812
U.S. Treasury And Government Agency Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to Maturity, Losses less than 12 months, Fair Value 13,212 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses 115 0
Held to Maturity, Losses 12 months or longer, Fair Value 306,716 316,814
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses 30,205 30,143
Held To Maturity Securities Unrealized Loss Position Fair Value, Total 319,928 316,814
Held to Maturity, Total, Gross Unrealized Losses 30,320 30,143
Municipal Obligations [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to Maturity, Losses less than 12 months, Fair Value 38,841 98,559
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses 145 97
Held to Maturity, Losses 12 months or longer, Fair Value 114,018 325,241
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses 11,561 11,358
Held To Maturity Securities Unrealized Loss Position Fair Value, Total 152,859 423,800
Held to Maturity, Total, Gross Unrealized Losses 11,706 11,455
Residential Mortgage-Backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to Maturity, Losses less than 12 months, Fair Value 0 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses 0 0
Held to Maturity, Losses 12 months or longer, Fair Value 423,909 463,099
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses 37,876 34,239
Held To Maturity Securities Unrealized Loss Position Fair Value, Total 423,909 463,099
Held to Maturity, Total, Gross Unrealized Losses 37,876 34,239
Commercial Mortgage-Backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to Maturity, Losses less than 12 months, Fair Value 0 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses 0 0
Held to Maturity, Losses 12 months or longer, Fair Value 654,662 684,874
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses 49,624 46,455
Held To Maturity Securities Unrealized Loss Position Fair Value, Total 654,662 684,874
Held to Maturity, Total, Gross Unrealized Losses 49,624 46,455
Collateralized Mortgage Obligations [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to Maturity, Losses less than 12 months, Fair Value 0 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses 0 0
Held to Maturity, Losses 12 months or longer, Fair Value 15,096 18,574
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses 532 520
Held To Maturity Securities Unrealized Loss Position Fair Value, Total 15,096 18,574
Held to Maturity, Total, Gross Unrealized Losses $ 532 $ 520