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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
Securities
Dec. 31, 2022
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 4,981 $ 19,424
Fair Value, Less Than Twelve Months 128,887 306,799
Gross Unrealized Losses, Twelve Months or More 32,496 26,092
Fair Value, Twelve Months or More 371,315 244,917
Total Unrealized Losses $ 37,477 $ 45,516
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 68 178
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 138 266
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 206 444
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 726 $ 2,389
Fair Value, Less Than Twelve Months 20,459 48,083
Gross Unrealized Losses, Twelve Months or More 2,661 2,514
Fair Value, Twelve Months or More 25,924 40,667
Total Unrealized Losses 3,387 4,903
Auction rate money market preferred [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 484 858
Fair Value, Twelve Months or More 2,716 2,342
Total Unrealized Losses 484 858
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 4,212 12,408
Fair Value, Less Than Twelve Months 106,964 201,316
Gross Unrealized Losses, Twelve Months or More 6,041 165
Fair Value, Twelve Months or More 87,195 4,411
Total Unrealized Losses 10,253 12,573
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 1,388
Fair Value, Less Than Twelve Months 0 18,331
Gross Unrealized Losses, Twelve Months or More 19,435 21,533
Fair Value, Twelve Months or More 212,086 190,369
Total Unrealized Losses 19,435 22,921
Corporate Debt 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 1,070 1,022
Fair Value, Twelve Months or More 7,080 7,128
Total Unrealized Losses 1,070 1,022
Mortgage Backed Securities, Other [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 43 3,239
Fair Value, Less Than Twelve Months 1,464 39,069
Gross Unrealized Losses, Twelve Months or More 2,805 0
Fair Value, Twelve Months or More 36,314 0
Total Unrealized Losses $ 2,848 $ 3,239