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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
investmentSecurity
Dec. 31, 2019
USD ($)
investmentSecurity
Less than 12 Months    
Number | investmentSecurity 180 45
Fair Value $ 1,207,091 $ 274,640
Gross Unrealized Losses $ (18,260) $ (3,258)
12 Months or Longer    
Number | investmentSecurity 10 21
Fair Value $ 11,655 $ 41,003
Gross Unrealized Losses $ (323) $ (834)
Total    
Number | investmentSecurity 190 66
Fair Value $ 1,218,746 $ 315,643
Gross Unrealized Losses $ (18,583) $ (4,092)
U.S. Treasury    
Less than 12 Months    
Number | investmentSecurity 0 1
Fair Value $ 0 $ 10,194
Gross Unrealized Losses $ 0 $ (39)
12 Months or Longer    
Number | investmentSecurity 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investmentSecurity 0 1
Fair Value $ 0 $ 10,194
Gross Unrealized Losses $ 0 $ (39)
Agency    
Less than 12 Months    
Number | investmentSecurity 3 13
Fair Value $ 57,720 $ 102,874
Gross Unrealized Losses $ (370) $ (1,340)
12 Months or Longer    
Number | investmentSecurity 9 9
Fair Value $ 11,179 $ 13,514
Gross Unrealized Losses $ (321) $ (336)
Total    
Number | investmentSecurity 12 22
Fair Value $ 68,899 $ 116,388
Gross Unrealized Losses $ (691) $ (1,676)
Corporate    
Less than 12 Months    
Number | investmentSecurity 17 1
Fair Value $ 145,419 $ 1,017
Gross Unrealized Losses $ (2,169) $ (14)
12 Months or Longer    
Number | investmentSecurity 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investmentSecurity 17 1
Fair Value $ 145,419 $ 1,017
Gross Unrealized Losses $ (2,169) $ (14)
Municipal bonds    
Less than 12 Months    
Number | investmentSecurity 141 12
Fair Value $ 776,203 $ 30,541
Gross Unrealized Losses $ (15,062) $ (184)
12 Months or Longer    
Number | investmentSecurity 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investmentSecurity 141 12
Fair Value $ 776,203 $ 30,541
Gross Unrealized Losses $ (15,062) $ (184)
Collateralized mortgage obligations    
Less than 12 Months    
Number | investmentSecurity 11 0
Fair Value $ 129,496 $ 0
Gross Unrealized Losses $ (463) $ 0
12 Months or Longer    
Number | investmentSecurity 1 1
Fair Value $ 476 $ 603
Gross Unrealized Losses $ (2) $ (8)
Total    
Number | investmentSecurity 12 1
Fair Value $ 129,972 $ 603
Gross Unrealized Losses $ (465) $ (8)
Mortgage-backed securities    
Less than 12 Months    
Number | investmentSecurity 8 18
Fair Value $ 98,253 $ 130,014
Gross Unrealized Losses $ (196) $ (1,681)
12 Months or Longer    
Number | investmentSecurity 0 11
Fair Value $ 0 $ 26,886
Gross Unrealized Losses $ 0 $ (490)
Total    
Number | investmentSecurity 8 29
Fair Value $ 98,253 $ 156,900
Gross Unrealized Losses $ (196) $ (2,171)