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Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 1,199,143 $ 1,221,496
Gross Unrealized Gains 51 74
Gross Unrealized Losses (114,109) (99,740)
Fair Value 1,085,085 1,121,830
Allowance for credit losses - held to maturity securities (32) (32)
Held to maturity securities, net of allowance for credit losses 1,199,111 1,221,464
Obligations of states and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 287,255 288,154
Gross Unrealized Gains 51 74
Gross Unrealized Losses (37,550) (33,688)
Fair Value 249,756 254,540
Residential mortgage backed securities:    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 379,244 387,208
Gross Unrealized Gains 0 0
Gross Unrealized Losses (36,971) (31,670)
Fair Value 342,273 355,538
Residential mortgage backed securities: | Government agency mortgage backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 414,485 426,264
Gross Unrealized Gains 0 0
Gross Unrealized Losses (24,465) (20,314)
Fair Value 390,020 405,950
Commercial mortgage backed securities: | Government agency mortgage backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 16,977 16,983
Gross Unrealized Gains 0 0
Gross Unrealized Losses (3,056) (2,972)
Fair Value 13,921 14,011
Commercial mortgage backed securities: | Government agency collateralized mortgage obligations    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 44,360 44,514
Gross Unrealized Gains 0 0
Gross Unrealized Losses (7,411) (6,977)
Fair Value 36,949 37,537
Other debt securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 56,822 58,373
Gross Unrealized Gains 0 0
Gross Unrealized Losses (4,656) (4,119)
Fair Value $ 52,166 $ 54,254