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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
investment_security
Dec. 31, 2020
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 208 106
Fair Value $ 2,074,690 $ 812,988
Gross Unrealized Losses $ (24,735) $ (5,319)
12 Months or Longer    
Number | investment_security 10 10
Fair Value $ 9,706 $ 10,865
Gross Unrealized Losses $ (266) $ (303)
Total    
Number | investment_security 218 116
Fair Value $ 2,084,396 $ 823,853
Gross Unrealized Losses $ (25,001) $ (5,622)
U.S. Treasury    
Less than 12 Months    
Number | investment_security 2  
Fair Value $ 38,568  
Gross Unrealized Losses $ (47)  
12 Months or Longer    
Number | investment_security 0  
Fair Value $ 0  
Gross Unrealized Losses $ 0  
Total    
Number | investment_security 2  
Fair Value $ 38,568  
Gross Unrealized Losses $ (47)  
Agency    
Less than 12 Months    
Number | investment_security 24 4
Fair Value $ 358,145 $ 74,194
Gross Unrealized Losses $ (5,244) $ (307)
12 Months or Longer    
Number | investment_security 9 9
Fair Value $ 9,355 $ 10,434
Gross Unrealized Losses $ (266) $ (301)
Total    
Number | investment_security 33 13
Fair Value $ 367,500 $ 84,628
Gross Unrealized Losses $ (5,510) $ (608)
Corporate    
Less than 12 Months    
Number | investment_security 11 9
Fair Value $ 91,496 $ 71,226
Gross Unrealized Losses $ (2,676) $ (506)
12 Months or Longer    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investment_security 11 9
Fair Value $ 91,496 $ 71,226
Gross Unrealized Losses $ (2,676) $ (506)
Municipal bonds    
Less than 12 Months    
Number | investment_security 68 56
Fair Value $ 375,132 $ 312,894
Gross Unrealized Losses $ (5,169) $ (3,253)
12 Months or Longer    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investment_security 68 56
Fair Value $ 375,132 $ 312,894
Gross Unrealized Losses $ (5,169) $ (3,253)
Collateralized mortgage obligations    
Less than 12 Months    
Number | investment_security 35 21
Fair Value $ 373,224 $ 215,603
Gross Unrealized Losses $ (3,145) $ (710)
12 Months or Longer    
Number | investment_security 1 1
Fair Value $ 351 $ 431
Gross Unrealized Losses $ 0 $ (2)
Total    
Number | investment_security 36 22
Fair Value $ 373,575 $ 216,034
Gross Unrealized Losses $ (3,145) $ (712)
Mortgage-backed securities    
Less than 12 Months    
Number | investment_security 68 16
Fair Value $ 838,125 $ 139,071
Gross Unrealized Losses $ (8,454) $ (543)
12 Months or Longer    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investment_security 68 16
Fair Value $ 838,125 $ 139,071
Gross Unrealized Losses $ (8,454) $ (543)