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Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Held to maturity securities:    
Held-to-maturity Securities, Duration of Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0  
Held-to-maturity Securities, Duration of Unrealized Loss Position, Less than 12 Months, Gross Unrealized Loss 0  
Held-to-maturity Securities, Duration of Unrealized Loss Position, Twelve Months or Longer, Fair Value 16  
Held-to-maturity Securities, Duration of Unrealized Loss Position, 12 Months or Longer, Gross Unrealized Loss (1)  
Held-to-maturity Securities, Duration of Unrealized Loss Position, Fair Value 16  
Held-to-maturity Securities, Duration of Unrealized Loss Position, Gross Unrealized Loss (1)  
Total temporarily impaired securities, Duration Unrealized Loss Position, Less Than Twelve Months, Fair Value 2,909 $ 40,928
Total temporarily impaired securities, Duration of Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Loss (31) (341)
Total temporarily impaired securities, Duration of Unrealized Loss Position, Twelve Months or Longer, Fair Value 36,697 137,099
Total temporarily impaired securities, Duration of Unrealized Loss Position, Twelve Months or Longer, Gross Unrealized Loss (327) (3,807)
Total temporarily impaired securities, Duration of Unrealized Loss Position, Fair Value 39,606 178,027
Total temporarily impaired securities, Duration of Unrealized Loss Position, Unrealized Loss (358) (4,148)
Mortgage-backed - residential [Member]    
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value 2,038 11,589
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss (14) (71)
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value 23,742 48,665
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss (211) (1,495)
Available-for-sale securities, Total, Fair Value 25,780 60,254
Available-for-sale securities, Total, Unrealized Loss (225) (1,566)
REMICs [Member]    
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value   0
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss   0
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value   857
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss   (7)
Available-for-sale securities, Total, Fair Value   857
Available-for-sale securities, Total, Unrealized Loss   (7)
Collateralized mortgage obligations [Member]    
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value 0 11,613
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss 0 (53)
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value 11,497 70,585
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss (110) (1,636)
Available-for-sale securities, Total, Fair Value 11,497 82,198
Available-for-sale securities, Total, Unrealized Loss (110) (1,689)
Corporate bonds [Member]    
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value 871 5,752
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss (17) (148)
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value 0 0
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss 0 0
Available-for-sale securities, Total, Fair Value 871 5,752
Available-for-sale securities, Total, Unrealized Loss (17) (148)
Obligations of state and political subdivisions [Member]    
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value 0 11,974
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss 0 (69)
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value 1,442 16,492
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss (5) (651)
Available-for-sale securities, Total, Fair Value 1,442 28,466
Available-for-sale securities, Total, Unrealized Loss (5) (720)
Obligations of U.S. government corporations and agencies [Member]    
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value 0 0
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss 0 0
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value 0 500
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss 0 (18)
Available-for-sale securities, Total, Fair Value 0 500
Available-for-sale securities, Total, Unrealized Loss $ 0 $ (18)