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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Mar. 31, 2025
USD ($)
Securities
Dec. 31, 2024
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 364 $ 671
Fair Value, Less Than Twelve Months 32,774 29,199
Gross Unrealized Losses, Twelve Months or More 21,275 25,825
Fair Value, Twelve Months or More 431,346 443,611
Total Unrealized Losses $ 21,639 $ 26,496
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 95 175
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 211 178
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 306 353
US Treasury 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 7,918 10,236
Fair Value, Twelve Months or More 212,783 220,571
Total Unrealized Losses 7,918 10,236
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 176 486
Fair Value, Less Than Twelve Months 15,510 23,553
Gross Unrealized Losses, Twelve Months or More 4,543 4,090
Fair Value, Twelve Months or More 40,418 36,796
Total Unrealized Losses 4,719 4,576
Auction Rate Securities [Member]    
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 371 156
Fair Value, Twelve Months or More 2,829 3,044
Total Unrealized Losses 371 156
Mortgage-backed securities [Member]    
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 1,717 2,182
Fair Value, Twelve Months or More 25,828 26,886
Total Unrealized Losses 1,717 2,182
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 103 185
Fair Value, Less Than Twelve Months 15,649 5,646
Gross Unrealized Losses, Twelve Months or More 5,961 8,297
Fair Value, Twelve Months or More 143,803 149,028
Total Unrealized Losses 6,064 8,482
Corporate Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 85 0
Fair Value, Less Than Twelve Months 1,615 0
Gross Unrealized Losses, Twelve Months or More 765 864
Fair Value, Twelve Months or More 5,685 7,286
Total Unrealized Losses $ 850 $ 864