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Investment Securities - Held-to-maturity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 675,647 $ 560,453
Allowance for Credit Losses (238) (241)
Gross Unrealized Gains 169 536
Gross Unrealized Losses (105,690) (82,239)
Fair Value 569,888 478,509
U.S. government sponsored agencies    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 174,699 132,366
Allowance for Credit Losses 0 0
Gross Unrealized Gains 0 130
Gross Unrealized Losses (13,714) (9,476)
Fair Value 160,985 123,020
States and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 144,728 145,263
Allowance for Credit Losses (238) (241)
Gross Unrealized Gains 84 162
Gross Unrealized Losses (39,764) (36,408)
Fair Value 104,810 108,776
Residential mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 248,627 176,215
Allowance for Credit Losses 0 0
Gross Unrealized Gains 85 244
Gross Unrealized Losses (29,742) (18,461)
Fair Value 218,970 157,998
Commercial mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 107,593 106,609
Allowance for Credit Losses 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses (22,470) (17,894)
Fair Value $ 85,123 $ 88,715