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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
investmentSecurity
Dec. 31, 2020
USD ($)
investmentSecurity
Less than 12 Months    
Number | investmentSecurity 321 106
Fair Value $ 2,444,228 $ 812,988
Gross Unrealized Losses $ (70,071) $ (5,319)
12 Months or Longer    
Number | investmentSecurity 10 10
Fair Value $ 10,335 $ 10,865
Gross Unrealized Losses $ (287) $ (303)
Total    
Number | investmentSecurity 331 116
Fair Value $ 2,454,563 $ 823,853
Gross Unrealized Losses $ (70,358) $ (5,622)
Agency    
Less than 12 Months    
Number | investmentSecurity 28 4
Fair Value $ 389,387 $ 74,194
Gross Unrealized Losses $ (10,094) $ (307)
12 Months or Longer    
Number | investmentSecurity 9 9
Fair Value $ 9,947 $ 10,434
Gross Unrealized Losses $ (285) $ (301)
Total    
Number | investmentSecurity 37 13
Fair Value $ 399,334 $ 84,628
Gross Unrealized Losses $ (10,379) $ (608)
Corporate    
Less than 12 Months    
Number | investmentSecurity 18 9
Fair Value $ 152,134 $ 71,226
Gross Unrealized Losses $ (4,911) $ (506)
12 Months or Longer    
Number | investmentSecurity 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investmentSecurity 18 9
Fair Value $ 152,134 $ 71,226
Gross Unrealized Losses $ (4,911) $ (506)
Municipal bonds    
Less than 12 Months    
Number | investmentSecurity 173 56
Fair Value $ 921,332 $ 312,894
Gross Unrealized Losses $ (32,394) $ (3,253)
12 Months or Longer    
Number | investmentSecurity 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investmentSecurity 173 56
Fair Value $ 921,332 $ 312,894
Gross Unrealized Losses $ (32,394) $ (3,253)
Collateralized mortgage obligations    
Less than 12 Months    
Number | investmentSecurity 32 21
Fair Value $ 309,975 $ 215,603
Gross Unrealized Losses $ (5,708) $ (710)
12 Months or Longer    
Number | investmentSecurity 1 1
Fair Value $ 388 $ 431
Gross Unrealized Losses $ (2) $ (2)
Total    
Number | investmentSecurity 33 22
Fair Value $ 310,363 $ 216,034
Gross Unrealized Losses $ (5,710) $ (712)
Mortgage-backed securities    
Less than 12 Months    
Number | investmentSecurity 70 16
Fair Value $ 671,400 $ 139,071
Gross Unrealized Losses $ (16,964) $ (543)
12 Months or Longer    
Number | investmentSecurity 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investmentSecurity 70 16
Fair Value $ 671,400 $ 139,071
Gross Unrealized Losses $ (16,964) $ (543)