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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
investment_security
Dec. 31, 2021
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 178 204
Fair Value $ 1,912,756 $ 2,302,658
Gross Unrealized Losses $ (158,244) $ (35,173)
12 Months or Longer    
Number | investment_security 68 51
Fair Value $ 626,801 $ 477,926
Gross Unrealized Losses $ (71,295) $ (15,784)
Total    
Number | investment_security 246 255
Fair Value $ 2,539,557 $ 2,780,584
Gross Unrealized Losses $ (229,539) $ (50,957)
U.S. Treasury    
Less than 12 Months    
Number | investment_security 2 3
Fair Value $ 33,360 $ 47,235
Gross Unrealized Losses $ (1,390) $ (456)
12 Months or Longer    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investment_security 2 3
Fair Value $ 33,360 $ 47,235
Gross Unrealized Losses $ (1,390) $ (456)
Agency    
Less than 12 Months    
Number | investment_security 9 19
Fair Value $ 69,116 $ 278,078
Gross Unrealized Losses $ (9,554) $ (5,634)
12 Months or Longer    
Number | investment_security 26 16
Fair Value $ 295,963 $ 119,750
Gross Unrealized Losses $ (31,030) $ (4,495)
Total    
Number | investment_security 35 35
Fair Value $ 365,079 $ 397,828
Gross Unrealized Losses $ (40,584) $ (10,129)
Corporate debt    
Less than 12 Months    
Number | investment_security 52 17
Fair Value $ 503,218 $ 166,563
Gross Unrealized Losses $ (21,134) $ (849)
12 Months or Longer    
Number | investment_security 3 3
Fair Value $ 48,161 $ 57,274
Gross Unrealized Losses $ (11,807) $ (3,007)
Total    
Number | investment_security 55 20
Fair Value $ 551,379 $ 223,837
Gross Unrealized Losses $ (32,941) $ (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 45 26
Fair Value $ 509,400 $ 226,763
Gross Unrealized Losses $ (27,406) $ (3,738)
12 Months or Longer    
Number | investment_security 29 15
Fair Value $ 206,125 $ 121,185
Gross Unrealized Losses $ (15,177) $ (2,317)
Total    
Number | investment_security 74 41
Fair Value $ 715,525 $ 347,948
Gross Unrealized Losses $ (42,583) $ (6,055)
Mortgage-backed securities    
Less than 12 Months    
Number | investment_security 70 103
Fair Value $ 797,662 $ 1,306,455
Gross Unrealized Losses $ (98,760) $ (20,417)
12 Months or Longer    
Number | investment_security 10 15
Fair Value $ 76,552 $ 173,121
Gross Unrealized Losses $ (13,281) $ (5,763)
Total    
Number | investment_security 80 118
Fair Value $ 874,214 $ 1,479,576
Gross Unrealized Losses $ (112,041) $ (26,180)