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Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 1,006,543 $ 1,030,105
Gross Unrealized Gains 9 29
Gross Unrealized Losses (77,856) (68,264)
Fair Value 928,696 961,870
Allowance for credit losses - held to maturity securities (32) (32)
Held-to-maturity securities, net of allowance for credit losses 1,006,511 1,030,073
Obligations of states and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 278,510 279,424
Gross Unrealized Gains 9 29
Gross Unrealized Losses (31,584) (29,516)
Fair Value 246,935 249,937
Residential mortgage backed securities:    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 312,961 320,258
Gross Unrealized Gains 0 0
Gross Unrealized Losses (23,348) (18,600)
Fair Value 289,613 301,658
Residential mortgage backed securities: | Agency mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 313,373 323,993
Gross Unrealized Gains 0 0
Gross Unrealized Losses (12,441) (10,030)
Fair Value 300,932 313,963
Commercial mortgage-backed securities: | Agency mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 16,901 16,938
Gross Unrealized Gains 0 0
Gross Unrealized Losses (2,079) (2,059)
Fair Value 14,822 14,879
Commercial mortgage-backed securities: | Collateralized mortgage obligations    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 41,851 42,079
Gross Unrealized Gains 0 0
Gross Unrealized Losses (6,004) (5,997)
Fair Value 35,847 36,082
Other debt securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 42,947 47,413
Gross Unrealized Gains 0 0
Gross Unrealized Losses (2,400) (2,062)
Fair Value $ 40,547 $ 45,351