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Investment Securities - Amortized Cost and Fair Value of Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]          
Amortized Cost $ 1,283,987 $ 1,289,710      
Allowance for Credit Losses (2,005) (2,005) $ (2,000) $ 0 $ 0
Net Carrying Amount 1,281,982 1,287,705      
Gross Unrealized Gains 562 196      
Gross Unrealized (Losses) (112,063) (161,755)      
Estimated Fair Value 1,170,481 1,126,146      
U.S. government-sponsored enterprises          
Schedule of Held-to-maturity Securities [Line Items]          
Amortized Cost 43,285 43,017      
Allowance for Credit Losses 0 0      
Net Carrying Amount 43,285 43,017      
Gross Unrealized Gains 0 0      
Gross Unrealized (Losses) (2,607) (3,349)      
Estimated Fair Value 40,678 39,668      
U.S. government-sponsored mortgage-backed securities          
Schedule of Held-to-maturity Securities [Line Items]          
Amortized Cost 130,278 135,000      
Allowance for Credit Losses 0 0      
Net Carrying Amount 130,278 135,000      
Gross Unrealized Gains 106 131      
Gross Unrealized (Losses) (4,362) (3,756)      
Estimated Fair Value 126,022 131,375      
State and political subdivisions          
Schedule of Held-to-maturity Securities [Line Items]          
Amortized Cost 1,110,424 1,111,693      
Allowance for Credit Losses (2,005) (2,005)      
Net Carrying Amount 1,108,419 1,109,688      
Gross Unrealized Gains 456 65      
Gross Unrealized (Losses) (105,094) (154,650)      
Estimated Fair Value $ 1,003,781 $ 955,103