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AFS Securities - AFS Securities with Gross Unrealized Losses (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 568 $ 671
Fair Value, Less Than Twelve Months 17,273 29,199
Gross Unrealized Losses, Twelve Months or More 13,103 25,825
Fair Value, Twelve Months or More 395,588 443,611
Total Unrealized Losses $ 13,671 $ 26,496
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | security 39 175
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | security 144 178
Number of Securities in an unrealized loss position, Total Unrealized Losses | security 183 353
U.S. Treasury    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 0 $ 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 4,421 10,236
Fair Value, Twelve Months or More 206,041 220,571
Total Unrealized Losses 4,421 10,236
States and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 449 486
Fair Value, Less Than Twelve Months 6,642 23,553
Gross Unrealized Losses, Twelve Months or More 2,517 4,090
Fair Value, Twelve Months or More 31,820 36,796
Total Unrealized Losses 2,966 4,576
Auction Rate Money Market Preferred    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 410 156
Fair Value, Twelve Months or More 2,790 3,044
Total Unrealized Losses 410 156
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 1,299 2,182
Fair Value, Twelve Months or More 23,397 26,886
Total Unrealized Losses 1,299 2,182
Collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 59 185
Fair Value, Less Than Twelve Months 8,991 5,646
Gross Unrealized Losses, Twelve Months or More 3,793 8,297
Fair Value, Twelve Months or More 125,753 149,028
Total Unrealized Losses 3,852 8,482
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 60 0
Fair Value, Less Than Twelve Months 1,640 0
Gross Unrealized Losses, Twelve Months or More 663 864
Fair Value, Twelve Months or More 5,787 7,286
Total Unrealized Losses $ 723 $ 864