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Investment Securities Available-for-Sale - Gross unrealized losses and fair value (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
security
Number of securities 35 148
Less than 12 months, estimated fair value $ 35,111 $ 274,947
Less than 12 months, unrealized losses 509 1,592
12 months or greater, estimated fair value 47,374 142,223
12 months or greater, unrealized losses 785 1,443
Estimated fair value 82,485 417,170
Unrealized losses $ 1,294 $ 3,035
U. S. agency securities    
Number of securities 23 36
Less than 12 months, estimated fair value $ 13,835 $ 75,159
Less than 12 months, unrealized losses 162 439
12 months or greater, estimated fair value 39,486 51,481
12 months or greater, unrealized losses 554 616
Estimated fair value 53,321 126,640
Unrealized losses $ 716 $ 1,055
Residential mortgage backed securities    
Number of securities 11 111
Less than 12 months, estimated fair value $ 18,321 $ 197,794
Less than 12 months, unrealized losses 275 1,148
12 months or greater, estimated fair value 7,888 90,742
12 months or greater, unrealized losses 231 827
Estimated fair value 26,209 288,536
Unrealized losses $ 506 $ 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 1  
Less than 12 months, estimated fair value $ 2,955  
Less than 12 months, unrealized losses 72  
Estimated fair value 2,955  
Unrealized losses $ 72