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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Less than 12 Months    
Number | security 35 45
Fair Value $ 236,232 $ 274,640
Gross Unrealized Losses $ (2,152) $ (3,258)
12 Months or Longer    
Number | security 10 21
Fair Value $ 12,209 $ 41,003
Gross Unrealized Losses $ (347) $ (834)
Total    
Number | security 45 66
Fair Value $ 248,441 $ 315,643
Gross Unrealized Losses $ (2,499) $ (4,092)
U.S. Treasury    
Less than 12 Months    
Number | security 0 1
Fair Value $ 0 $ 10,194
Gross Unrealized Losses $ 0 $ (39)
12 Months or Longer    
Number | security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | security 0 1
Fair Value $ 0 $ 10,194
Gross Unrealized Losses $ 0 $ (39)
Agency    
Less than 12 Months    
Number | security 1 13
Fair Value $ 12,361 $ 102,874
Gross Unrealized Losses $ (10) $ (1,340)
12 Months or Longer    
Number | security 9 9
Fair Value $ 11,687 $ 13,514
Gross Unrealized Losses $ (346) $ (336)
Total    
Number | security 10 22
Fair Value $ 24,048 $ 116,388
Gross Unrealized Losses $ (356) $ (1,676)
Corporate    
Less than 12 Months    
Number | security 13 1
Fair Value $ 84,559 $ 1,017
Gross Unrealized Losses $ (1,775) $ (14)
12 Months or Longer    
Number | security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | security 13 1
Fair Value $ 84,559 $ 1,017
Gross Unrealized Losses $ (1,775) $ (14)
Municipal bonds    
Less than 12 Months    
Number | security 7 12
Fair Value $ 19,326 $ 30,541
Gross Unrealized Losses $ (66) $ (184)
12 Months or Longer    
Number | security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | security 7 12
Fair Value $ 19,326 $ 30,541
Gross Unrealized Losses $ (66) $ (184)
Collateralized mortgage obligations    
Less than 12 Months    
Number | security 3 0
Fair Value $ 26,593 $ 0
Gross Unrealized Losses $ (47) $ 0
12 Months or Longer    
Number | security 1 1
Fair Value $ 522 $ 603
Gross Unrealized Losses $ (1) $ (8)
Total    
Number | security 4 1
Fair Value $ 27,115 $ 603
Gross Unrealized Losses $ (48) $ (8)
Mortgage-backed securities    
Less than 12 Months    
Number | security 11 18
Fair Value $ 93,393 $ 130,014
Gross Unrealized Losses $ (254) $ (1,681)
12 Months or Longer    
Number | security 0 11
Fair Value $ 0 $ 26,886
Gross Unrealized Losses $ 0 $ (490)
Total    
Number | security 11 29
Fair Value $ 93,393 $ 156,900
Gross Unrealized Losses $ (254) $ (2,171)