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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
investment_security
Dec. 31, 2020
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 285 106
Fair Value $ 2,984,162 $ 812,988
Gross Unrealized Losses $ (38,767) $ (5,319)
12 Months or Longer    
Number | investment_security 21 10
Fair Value $ 148,415 $ 10,865
Gross Unrealized Losses $ (3,716) $ (303)
Total    
Number | investment_security 306 116
Fair Value $ 3,132,577 $ 823,853
Gross Unrealized Losses $ (42,483) $ (5,622)
U.S. Treasury    
Less than 12 Months    
Number | investment_security 2  
Fair Value $ 32,626  
Gross Unrealized Losses $ (126)  
12 Months or Longer    
Number | investment_security 0  
Fair Value $ 0  
Gross Unrealized Losses $ 0  
Total    
Number | investment_security 2  
Fair Value $ 32,626  
Gross Unrealized Losses $ (126)  
Agency    
Less than 12 Months    
Number | investment_security 24 4
Fair Value $ 339,270 $ 74,194
Gross Unrealized Losses $ (5,365) $ (307)
12 Months or Longer    
Number | investment_security 12 9
Fair Value $ 64,991 $ 10,434
Gross Unrealized Losses $ (1,661) $ (301)
Total    
Number | investment_security 36 13
Fair Value $ 404,261 $ 84,628
Gross Unrealized Losses $ (7,026) $ (608)
Corporate    
Less than 12 Months    
Number | investment_security 8 9
Fair Value $ 88,666 $ 71,226
Gross Unrealized Losses $ (1,916) $ (506)
12 Months or Longer    
Number | investment_security 1 0
Fair Value $ 20,346 $ 0
Gross Unrealized Losses $ (984) $ 0
Total    
Number | investment_security 9 9
Fair Value $ 109,012 $ 71,226
Gross Unrealized Losses $ (2,900) $ (506)
Municipal bonds    
Less than 12 Months    
Number | investment_security 108 56
Fair Value $ 651,169 $ 312,894
Gross Unrealized Losses $ (9,102) $ (3,253)
12 Months or Longer    
Number | investment_security 2 0
Fair Value $ 11,068 $ 0
Gross Unrealized Losses $ (540) $ 0
Total    
Number | investment_security 110 56
Fair Value $ 662,237 $ 312,894
Gross Unrealized Losses $ (9,642) $ (3,253)
Collateralized mortgage obligations    
Less than 12 Months    
Number | investment_security 30 21
Fair Value $ 302,104 $ 215,603
Gross Unrealized Losses $ (4,297) $ (710)
12 Months or Longer    
Number | investment_security 5 1
Fair Value $ 44,615 $ 431
Gross Unrealized Losses $ (432) $ (2)
Total    
Number | investment_security 35 22
Fair Value $ 346,719 $ 216,034
Gross Unrealized Losses $ (4,729) $ (712)
Mortgage-backed securities    
Less than 12 Months    
Number | investment_security 113 16
Fair Value $ 1,570,327 $ 139,071
Gross Unrealized Losses $ (17,961) $ (543)
12 Months or Longer    
Number | investment_security 1 0
Fair Value $ 7,395 $ 0
Gross Unrealized Losses $ (99) $ 0
Total    
Number | investment_security 114 16
Fair Value $ 1,577,722 $ 139,071
Gross Unrealized Losses $ (18,060) $ (543)