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Investment Securities Available-for-Sale - Gross unrealized losses and fair value (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
security
Number of securities 148 221
Less than 12 months, estimated fair value $ 274,947 $ 139,671
Less than 12 months, unrealized losses 1,592 1,116
12 months or greater, estimated fair value 142,223 387,672
12 months or greater, unrealized losses 1,443 10,700
Estimated fair value 417,170 527,343
Unrealized losses $ 3,035 $ 11,816
U. S. agency securities    
Number of securities 36 58
Less than 12 months, estimated fair value $ 75,159 $ 72,679
Less than 12 months, unrealized losses 439 533
12 months or greater, estimated fair value 51,481 144,636
12 months or greater, unrealized losses 616 3,500
Estimated fair value 126,640 217,315
Unrealized losses $ 1,055 $ 4,033
Residential mortgage backed securities    
Number of securities 111 151
Less than 12 months, estimated fair value $ 197,794 $ 61,199
Less than 12 months, unrealized losses 1,148 527
12 months or greater, estimated fair value 90,742 225,995
12 months or greater, unrealized losses 827 6,766
Estimated fair value 288,536 287,194
Unrealized losses $ 1,975 $ 7,293
Municipal bonds    
Number of securities 1 11
Less than 12 months, estimated fair value $ 1,994 $ 4,299
Less than 12 months, unrealized losses 5 50
12 months or greater, estimated fair value   17,041
12 months or greater, unrealized losses   434
Estimated fair value 1,994 21,340
Unrealized losses $ 5 $ 484
Corporate bonds    
Number of securities | security   1
Less than 12 months, estimated fair value   $ 1,494
Less than 12 months, unrealized losses   6
Estimated fair value   1,494
Unrealized losses   $ 6