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Debt Securities Available for Sale - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Fair Value    
Less Than 12 Months $ 109,331 $ 522,609
12 Months or Longer 1,138,763 788,133
Total 1,248,094 1,310,742
Gross Unrealized (Losses)    
Less Than 12 Months (8,924) (37,286)
12 Months or Longer (162,386) (150,162)
Total (171,310) (187,448)
U.S. government and agency obligations    
Fair Value    
Less Than 12 Months 1,408 47,956
12 Months or Longer 20,231 15,610
Total 21,639 63,566
Gross Unrealized (Losses)    
Less Than 12 Months (53) (2,359)
12 Months or Longer (1,740) (1,846)
Total (1,793) (4,205)
Mortgage-backed securities and collateralized mortgage obligations    
Fair Value    
Less Than 12 Months 87,503 424,328
12 Months or Longer 1,060,893 741,515
Total 1,148,396 1,165,843
Gross Unrealized (Losses)    
Less Than 12 Months (3,544) (29,013)
12 Months or Longer (149,797) (141,324)
Total (153,341) (170,337)
Municipal obligations    
Fair Value    
Less Than 12 Months 3,111 3,574
12 Months or Longer 438 0
Total 3,549 3,574
Gross Unrealized (Losses)    
Less Than 12 Months (136) (122)
12 Months or Longer (11) 0
Total (147) (122)
Corporate debt securities    
Fair Value    
Less Than 12 Months 17,309 46,751
12 Months or Longer 57,201 31,008
Total 74,510 77,759
Gross Unrealized (Losses)    
Less Than 12 Months (5,191) (5,792)
12 Months or Longer (10,838) (6,992)
Total $ (16,029) $ (12,784)