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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Amortized Cost $ 3,922,780  
Gross Unrealized Gains 19,223  
Gross Unrealized Losses (322,134)  
Estimated Fair Value 3,619,869 $ 3,410,899
Amortized Cost, Held to Maturity 1,473,158 1,395,569
Gross Unrealized Gains, Held to Maturity 1,813 2
Gross Unrealized Losses, Held to Maturity (181,970) (212,122)
Debt Securities, Held-to-Maturity, Fair Value 1,293,001 1,183,449
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost 956,015 960,227
Gross Unrealized Gains 24 106
Gross Unrealized Losses (181,290) (145,446)
Estimated Fair Value 774,749 814,887
Corporate Debt Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost 274,981 313,681
Gross Unrealized Gains 632 1,123
Gross Unrealized Losses (11,515) (14,434)
Estimated Fair Value 264,098 300,370
Collateralized Mortgage Obligations [Member]    
Schedule of Investments [Line Items]    
Amortized Cost 1,165,014 798,157
Gross Unrealized Gains 15,552 4,629
Gross Unrealized Losses (8,328) (13,901)
Estimated Fair Value 1,172,238 788,885
Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost 922,074 1,029,846
Gross Unrealized Gains 3,014 30
Gross Unrealized Losses (28,353) (40,001)
Estimated Fair Value 896,735 989,875
Amortized Cost, Held to Maturity 618,955 537,856
Gross Unrealized Gains, Held to Maturity 1,813 2
Gross Unrealized Losses, Held to Maturity (51,071) (60,162)
Debt Securities, Held-to-Maturity, Fair Value 569,697 477,696
Commercial Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost 604,696 617,605
Gross Unrealized Gains 1 0
Gross Unrealized Losses (92,648) (100,723)
Estimated Fair Value 512,049 516,882
Amortized Cost, Held to Maturity 854,203 857,713
Gross Unrealized Gains, Held to Maturity 0 0
Gross Unrealized Losses, Held to Maturity (130,899) (151,960)
Debt Securities, Held-to-Maturity, Fair Value $ 723,304 705,753
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost   3,719,516
Gross Unrealized Gains   5,888
Gross Unrealized Losses   (314,505)
Estimated Fair Value   $ 3,410,899