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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
investment_security
Dec. 31, 2022
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 2 102
Fair Value $ 21,409 $ 1,056,578
Gross Unrealized Losses $ (3,438) $ (62,647)
12 Months or Longer    
Number | investment_security 220 165
Fair Value $ 1,878,196 $ 1,544,392
Gross Unrealized Losses $ (293,274) $ (241,085)
Total    
Number | investment_security 222 267
Fair Value $ 1,899,605 $ 2,600,970
Gross Unrealized Losses $ (296,712) $ (303,732)
U.S. Treasury    
Less than 12 Months    
Number | investment_security 0 5
Fair Value $ 0 $ 33,982
Gross Unrealized Losses $ 0 $ (237)
12 Months or Longer    
Number | investment_security 1 1
Fair Value $ 12,914 $ 13,036
Gross Unrealized Losses $ (2,033) $ (1,902)
Total    
Number | investment_security 1 6
Fair Value $ 12,914 $ 47,018
Gross Unrealized Losses $ (2,033) $ (2,139)
Agency    
Less than 12 Months    
Number | investment_security 0 8
Fair Value $ 0 $ 79,895
Gross Unrealized Losses $ 0 $ (1,265)
12 Months or Longer    
Number | investment_security 40 35
Fair Value $ 405,514 $ 351,543
Gross Unrealized Losses $ (52,180) $ (52,628)
Total    
Number | investment_security 40 43
Fair Value $ 405,514 $ 431,438
Gross Unrealized Losses $ (52,180) $ (53,893)
Corporate    
Less than 12 Months    
Number | investment_security 1 35
Fair Value $ 16,623 $ 327,984
Gross Unrealized Losses $ (3,377) $ (20,840)
12 Months or Longer    
Number | investment_security 51 21
Fair Value $ 473,191 $ 214,565
Gross Unrealized Losses $ (52,745) $ (23,264)
Total    
Number | investment_security 52 56
Fair Value $ 489,814 $ 542,549
Gross Unrealized Losses $ (56,122) $ (44,104)
Collateralized mortgage obligations    
Less than 12 Months    
Number | investment_security 1 41
Fair Value $ 4,786 $ 522,955
Gross Unrealized Losses $ (61) $ (33,318)
12 Months or Longer    
Number | investment_security 49 40
Fair Value $ 299,544 $ 241,229
Gross Unrealized Losses $ (32,804) $ (32,381)
Total    
Number | investment_security 50 81
Fair Value $ 304,330 $ 764,184
Gross Unrealized Losses $ (32,865) $ (65,699)
Mortgage-backed securities    
Less than 12 Months    
Number | investment_security 0 13
Fair Value $ 0 $ 91,762
Gross Unrealized Losses $ 0 $ (6,987)
12 Months or Longer    
Number | investment_security 79 68
Fair Value $ 687,033 $ 724,019
Gross Unrealized Losses $ (153,512) $ (130,910)
Total    
Number | investment_security 79 81
Fair Value $ 687,033 $ 815,781
Gross Unrealized Losses $ (153,512) $ (137,897)