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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
investment_security
Dec. 31, 2022
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 83 102
Fair Value $ 640,552 $ 1,056,578
Gross Unrealized Losses $ (50,471) $ (62,647)
12 Months or Longer    
Number | investment_security 165 165
Fair Value $ 1,472,300 $ 1,544,392
Gross Unrealized Losses $ (202,550) $ (241,085)
Total    
Number | investment_security 248 267
Fair Value $ 2,112,852 $ 2,600,970
Gross Unrealized Losses $ (253,021) $ (303,732)
U.S. Treasury    
Less than 12 Months    
Number | investment_security 14 5
Fair Value $ 13,355 $ 33,982
Gross Unrealized Losses $ (1,586) $ (237)
12 Months or Longer    
Number | investment_security 0 1
Fair Value $ 0 $ 13,036
Gross Unrealized Losses $ 0 $ (1,902)
Total    
Number | investment_security 14 6
Fair Value $ 13,355 $ 47,018
Gross Unrealized Losses $ (1,586) $ (2,139)
Agency    
Less than 12 Months    
Number | investment_security 13 8
Fair Value $ 142,489 $ 79,895
Gross Unrealized Losses $ (12,151) $ (1,265)
12 Months or Longer    
Number | investment_security 30 35
Fair Value $ 275,242 $ 351,543
Gross Unrealized Losses $ (34,609) $ (52,628)
Total    
Number | investment_security 43 43
Fair Value $ 417,731 $ 431,438
Gross Unrealized Losses $ (46,760) $ (53,893)
Corporate    
Less than 12 Months    
Number | investment_security 19 35
Fair Value $ 158,469 $ 327,984
Gross Unrealized Losses $ (14,917) $ (20,840)
12 Months or Longer    
Number | investment_security 37 21
Fair Value $ 349,720 $ 214,565
Gross Unrealized Losses $ (38,274) $ (23,264)
Total    
Number | investment_security 56 56
Fair Value $ 508,189 $ 542,549
Gross Unrealized Losses $ (53,191) $ (44,104)
Collateralized mortgage obligations    
Less than 12 Months    
Number | investment_security 20 41
Fair Value $ 185,232 $ 522,955
Gross Unrealized Losses $ (9,004) $ (33,318)
12 Months or Longer    
Number | investment_security 34 40
Fair Value $ 187,400 $ 241,229
Gross Unrealized Losses $ (19,469) $ (32,381)
Total    
Number | investment_security 54 81
Fair Value $ 372,632 $ 764,184
Gross Unrealized Losses $ (28,473) $ (65,699)
Mortgage-backed securities    
Less than 12 Months    
Number | investment_security 17 13
Fair Value $ 141,007 $ 91,762
Gross Unrealized Losses $ (12,813) $ (6,987)
12 Months or Longer    
Number | investment_security 64 68
Fair Value $ 659,938 $ 724,019
Gross Unrealized Losses $ (110,198) $ (130,910)
Total    
Number | investment_security 81 81
Fair Value $ 800,945 $ 815,781
Gross Unrealized Losses $ (123,011) $ (137,897)