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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
investment_security
Dec. 31, 2021
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 122 204
Fair Value $ 1,229,181 $ 2,302,658
Gross Unrealized Losses $ (73,968) $ (35,173)
12 Months or Longer    
Number | investment_security 146 51
Fair Value $ 1,424,395 $ 477,926
Gross Unrealized Losses $ (250,368) $ (15,784)
Total    
Number | investment_security 268 255
Fair Value $ 2,653,576 $ 2,780,584
Gross Unrealized Losses $ (324,336) $ (50,957)
U.S. Treasury    
Less than 12 Months    
Number | investment_security 5 3
Fair Value $ 33,865 $ 47,235
Gross Unrealized Losses $ (125) $ (456)
12 Months or Longer    
Number | investment_security 1 0
Fair Value $ 12,909 $ 0
Gross Unrealized Losses $ (2,027) $ 0
Total    
Number | investment_security 6 3
Fair Value $ 46,774 $ 47,235
Gross Unrealized Losses $ (2,152) $ (456)
Agency    
Less than 12 Months    
Number | investment_security 8 19
Fair Value $ 80,049 $ 278,078
Gross Unrealized Losses $ (1,118) $ (5,634)
12 Months or Longer    
Number | investment_security 35 16
Fair Value $ 350,814 $ 119,750
Gross Unrealized Losses $ (54,130) $ (4,495)
Total    
Number | investment_security 43 35
Fair Value $ 430,863 $ 397,828
Gross Unrealized Losses $ (55,248) $ (10,129)
Corporate debt    
Less than 12 Months    
Number | investment_security 49 17
Fair Value $ 468,523 $ 166,563
Gross Unrealized Losses $ (28,413) $ (849)
12 Months or Longer    
Number | investment_security 8 3
Fair Value $ 87,227 $ 57,274
Gross Unrealized Losses $ (17,895) $ (3,007)
Total    
Number | investment_security 57 20
Fair Value $ 555,750 $ 223,837
Gross Unrealized Losses $ (46,308) $ (3,856)
Municipal bonds    
Less than 12 Months    
Number | investment_security   36
Fair Value   $ 277,564
Gross Unrealized Losses   $ (4,079)
12 Months or Longer    
Number | investment_security   2
Fair Value   $ 6,596
Gross Unrealized Losses   $ (202)
Total    
Number | investment_security   38
Fair Value   $ 284,160
Gross Unrealized Losses   $ (4,281)
Collateralized mortgage obligations    
Less than 12 Months    
Number | investment_security 44 26
Fair Value $ 543,696 $ 226,763
Gross Unrealized Losses $ (35,355) $ (3,738)
12 Months or Longer    
Number | investment_security 36 15
Fair Value $ 239,916 $ 121,185
Gross Unrealized Losses $ (30,421) $ (2,317)
Total    
Number | investment_security 80 41
Fair Value $ 783,612 $ 347,948
Gross Unrealized Losses $ (65,776) $ (6,055)
Mortgage-backed securities    
Less than 12 Months    
Number | investment_security 16 103
Fair Value $ 103,048 $ 1,306,455
Gross Unrealized Losses $ (8,957) $ (20,417)
12 Months or Longer    
Number | investment_security 66 15
Fair Value $ 733,529 $ 173,121
Gross Unrealized Losses $ (145,895) $ (5,763)
Total    
Number | investment_security 82 118
Fair Value $ 836,577 $ 1,479,576
Gross Unrealized Losses $ (154,852) $ (26,180)