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Investment Securities - Amortized Cost and Fair Value of Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost $ 1,280,858 $ 1,283,987    
Allowance for Credit Losses (2,005) (2,005) $ (2,005) $ (2,005)
Net Carrying Amount 1,278,853 1,281,982    
Gross Unrealized Gains 127 562    
Gross Unrealized (Losses) (119,820) (112,063)    
Estimated Fair Value 1,159,160 1,170,481    
U.S. government-sponsored enterprises        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 43,421 43,285    
Allowance for Credit Losses 0 0    
Net Carrying Amount 43,421 43,285    
Gross Unrealized Gains 0 0    
Gross Unrealized (Losses) (3,146) (2,607)    
Estimated Fair Value 40,275 40,678    
U.S. government-sponsored mortgage-backed securities        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 127,464 130,278    
Allowance for Credit Losses 0 0    
Net Carrying Amount 127,464 130,278    
Gross Unrealized Gains 47 106    
Gross Unrealized (Losses) (6,084) (4,362)    
Estimated Fair Value 121,427 126,022    
State and political subdivisions        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 1,109,973 1,110,424    
Allowance for Credit Losses (2,005) (2,005)    
Net Carrying Amount 1,107,968 1,108,419    
Gross Unrealized Gains 80 456    
Gross Unrealized (Losses) (110,590) (105,094)    
Estimated Fair Value $ 997,458 $ 1,003,781