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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
investment_security
Dec. 31, 2019
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 0 45
Fair Value $ 0 $ 274,640
Gross Unrealized Losses $ 0 $ (3,258)
12 Months or Longer    
Number | investment_security 23 21
Fair Value $ 79,406 $ 41,003
Gross Unrealized Losses $ (1,583) $ (834)
Total    
Number | investment_security 23 66
Fair Value $ 79,406 $ 315,643
Gross Unrealized Losses $ (1,583) $ (4,092)
Held-to-maturity, less than 12 months, number of securities | investment_security 0 0
Held-to-maturity, less than 12 months, fair value $ 0 $ 0
Held-to-maturity, less than 12 months, gross unrealized holding losses $ 0 $ 0
Held-to-maturity, 12 months or longer, number of securities | investment_security 0 0
Held-to-maturity, 12 months or longer, fair value $ 0 $ 0
Held-to-maturity, 12 months or longer, gross unrealized holding losses $ 0 $ 0
Held-to-maturity, number of securities | investment_security 0 0
Held-to-maturity securities, fair value $ 0 $ 0
Unrealized Loss $ 0 $ 0
Total securities, less than 12 months, number of securities | investment_security 0 45
Total securities, less than 12 months, fair value $ 0 $ 274,640
Total securities, less than 12 months, gross unrealized holding losses $ 0 $ (3,258)
Total securities, 12 months or longer, number of securities | investment_security 23 21
Total securities, 12 months or longer, fair value $ 79,406 $ 41,003
Total securities, 12 months or longer, gross unrealized holding losses $ (1,583) $ (834)
Total securities, number of securities | investment_security 23 66
Total securities, fair value $ 79,406 $ 315,643
Total securities, gross unrealized holding losses $ (1,583) $ (4,092)
U.S. Treasury    
Less than 12 Months    
Number | investment_security 0 1
Fair Value $ 0 $ 10,194
Gross Unrealized Losses $ 0 $ (39)
12 Months or Longer    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investment_security 0 1
Fair Value $ 0 $ 10,194
Gross Unrealized Losses $ 0 $ (39)
Agency    
Less than 12 Months    
Number | investment_security 0 13
Fair Value $ 0 $ 102,874
Gross Unrealized Losses $ 0 $ (1,340)
12 Months or Longer    
Number | investment_security 9 9
Fair Value $ 12,166 $ 13,514
Gross Unrealized Losses $ (299) $ (336)
Total    
Number | investment_security 9 22
Fair Value $ 12,166 $ 116,388
Gross Unrealized Losses $ (299) $ (1,676)
Corporate    
Less than 12 Months    
Number | investment_security 0 1
Fair Value $ 0 $ 1,017
Gross Unrealized Losses $ 0 $ (14)
12 Months or Longer    
Number | investment_security 8 0
Fair Value $ 47,012 $ 0
Gross Unrealized Losses $ (786) $ 0
Total    
Number | investment_security 8 1
Fair Value $ 47,012 $ 1,017
Gross Unrealized Losses $ (786) $ (14)
Municipal bonds    
Less than 12 Months    
Number | investment_security 0 12
Fair Value $ 0 $ 30,541
Gross Unrealized Losses $ 0 $ (184)
12 Months or Longer    
Number | investment_security 5 0
Fair Value $ 19,663 $ 0
Gross Unrealized Losses $ (497) $ 0
Total    
Number | investment_security 5 12
Fair Value $ 19,663 $ 30,541
Gross Unrealized Losses $ (497) $ (184)
Collateralized mortgage obligations    
Less than 12 Months    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
12 Months or Longer    
Number | investment_security 1 1
Fair Value $ 565 $ 603
Gross Unrealized Losses $ (1) $ (8)
Total    
Number | investment_security 1 1
Fair Value $ 565 $ 603
Gross Unrealized Losses $ (1) $ (8)
Mortgage-backed securities    
Less than 12 Months    
Number | investment_security 0 18
Fair Value $ 0 $ 130,014
Gross Unrealized Losses $ 0 $ (1,681)
12 Months or Longer    
Number | investment_security 0 11
Fair Value $ 0 $ 26,886
Gross Unrealized Losses $ 0 $ (490)
Total    
Number | investment_security 0 29
Fair Value $ 0 $ 156,900
Gross Unrealized Losses $ 0 $ (2,171)
Held-to-maturity, less than 12 months, number of securities | investment_security 0 0
Held-to-maturity, less than 12 months, fair value $ 0 $ 0
Held-to-maturity, less than 12 months, gross unrealized holding losses $ 0 $ 0
Held-to-maturity, 12 months or longer, number of securities | investment_security 0 0
Held-to-maturity, 12 months or longer, fair value $ 0 $ 0
Held-to-maturity, 12 months or longer, gross unrealized holding losses $ 0 $ 0
Held-to-maturity, number of securities | investment_security 0 0
Held-to-maturity securities, fair value $ 0 $ 0
Unrealized Loss $ 0 $ 0
Other    
Total    
Held-to-maturity, less than 12 months, number of securities | investment_security 0  
Held-to-maturity, less than 12 months, fair value $ 0  
Held-to-maturity, less than 12 months, gross unrealized holding losses $ 0  
Held-to-maturity, 12 months or longer, number of securities | investment_security 0  
Held-to-maturity, 12 months or longer, fair value $ 0  
Held-to-maturity, 12 months or longer, gross unrealized holding losses $ 0  
Held-to-maturity, number of securities | investment_security 0  
Held-to-maturity securities, fair value $ 0  
Unrealized Loss $ 0