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Investment Securities Available-for-Sale - Gross unrealized losses and fair value (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Number of securities | security 47 148
Less than 12 months, estimated fair value $ 70,964 $ 274,947
Less than 12 months, unrealized losses 243 1,592
12 months or greater, estimated fair value 45,008 142,223
12 months or greater, unrealized losses 699 1,443
Estimated fair value 115,972 417,170
Unrealized losses $ 942 $ 3,035
U. S. agency securities    
Number of securities | security 25 36
Less than 12 months, estimated fair value $ 24,653 $ 75,159
Less than 12 months, unrealized losses 99 439
12 months or greater, estimated fair value 37,287 51,481
12 months or greater, unrealized losses 650 616
Estimated fair value 61,940 126,640
Unrealized losses $ 749 $ 1,055
Residential mortgage backed securities    
Number of securities | security 20 111
Less than 12 months, estimated fair value $ 41,864 $ 197,794
Less than 12 months, unrealized losses 66 1,148
12 months or greater, estimated fair value 7,721 90,742
12 months or greater, unrealized losses 49 827
Estimated fair value 49,585 288,536
Unrealized losses $ 115 $ 1,975
Municipal bonds    
Number of securities | security   1
Less than 12 months, estimated fair value   $ 1,994
Less than 12 months, unrealized losses   5
Estimated fair value   1,994
Unrealized losses   $ 5
Corporate bonds    
Number of securities | security 2  
Less than 12 months, estimated fair value $ 4,447  
Less than 12 months, unrealized losses 78  
Estimated fair value 4,447  
Unrealized losses $ 78