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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
investment_security
Dec. 31, 2023
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 21 5
Fair Value $ 515,076 $ 103,611
Gross Unrealized Losses $ (193) $ (27)
12 Months or Longer    
Number | investment_security 73 79
Fair Value $ 515,803 $ 585,825
Gross Unrealized Losses $ (34,086) $ (36,375)
Total    
Number | investment_security 94 84
Fair Value $ 1,030,879 $ 689,436
Gross Unrealized Losses $ (34,279) $ (36,402)
U.S. Treasury    
Less than 12 Months    
Number | investment_security 21 4
Fair Value $ 515,076 $ 98,622
Gross Unrealized Losses $ (193) $ (24)
12 Months or Longer    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investment_security 21 4
Fair Value $ 515,076 $ 98,622
Gross Unrealized Losses $ (193) $ (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 $ 1,670 $ 1,868
Gross Unrealized Losses $ (64) $ (73)
Total    
Number | investment_security 4 4
Fair Value $ 1,670 $ 1,868
Gross Unrealized Losses $ (64) $ (73)
Corporate    
Less than 12 Months    
Number | investment_security 0 1
Fair Value $ 0 $ 4,989
Gross Unrealized Losses $ 0 $ (3)
12 Months or Longer    
Number | investment_security 41 47
Fair Value $ 365,603 $ 431,353
Gross Unrealized Losses $ (32,787) $ (35,205)
Total    
Number | investment_security 41 48
Fair Value $ 365,603 $ 436,342
Gross Unrealized Losses $ (32,787) $ (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 28 28
Fair Value $ 148,530 $ 152,604
Gross Unrealized Losses $ (1,235) $ (1,097)
Total    
Number | investment_security 28 28
Fair Value $ 148,530 $ 152,604
Gross Unrealized Losses $ (1,235) $ (1,097)