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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Jun. 30, 2024
USD ($)
investment_security
Dec. 31, 2023
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 29 5
Fair Value $ 653,805 $ 103,611
Gross Unrealized Losses $ (544) $ (27)
12 Months or Longer    
Number | investment_security 65 79
Fair Value $ 444,932 $ 585,825
Gross Unrealized Losses $ (29,717) $ (36,375)
Total    
Number | investment_security 94 84
Fair Value $ 1,098,737 $ 689,436
Gross Unrealized Losses $ (30,261) $ (36,402)
U.S. Treasury    
Less than 12 Months    
Number | investment_security 25 4
Fair Value $ 614,355 $ 98,622
Gross Unrealized Losses $ (412) $ (24)
12 Months or Longer    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investment_security 25 4
Fair Value $ 614,355 $ 98,622
Gross Unrealized Losses $ (412) $ (24)
Agency    
Less than 12 Months    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
12 Months or Longer    
Number | investment_security 4 4
Fair Value $ 1,526 $ 1,868
Gross Unrealized Losses $ (57) $ (73)
Total    
Number | investment_security 4 4
Fair Value $ 1,526 $ 1,868
Gross Unrealized Losses $ (57) $ (73)
Corporate    
Less than 12 Months    
Number | investment_security 4 1
Fair Value $ 39,450 $ 4,989
Gross Unrealized Losses $ (132) $ (3)
12 Months or Longer    
Number | investment_security 36 47
Fair Value $ 317,976 $ 431,353
Gross Unrealized Losses $ (28,778) $ (35,205)
Total    
Number | investment_security 40 48
Fair Value $ 357,426 $ 436,342
Gross Unrealized Losses $ (28,910) $ (35,208)
Collateralized mortgage obligations    
Less than 12 Months    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
12 Months or Longer    
Number | investment_security 25 28
Fair Value $ 125,430 $ 152,604
Gross Unrealized Losses $ (882) $ (1,097)
Total    
Number | investment_security 25 28
Fair Value $ 125,430 $ 152,604
Gross Unrealized Losses $ (882) $ (1,097)