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Investment Securities Available-for-Sale (Details 1)
$ in Thousands
Mar. 31, 2019
USD ($)
Number
Dec. 31, 2018
USD ($)
Number
Available-for-sale securities in a continuous loss position, number of securities | Number 203 221
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 74,699 $ 139,671
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 461 1,116
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 398,012 387,672
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 6,009 10,700
Available-for-sale securities in a continuous loss position, estimated fair value 472,711 527,343
Available-for-sale securities in a continuous loss position, unrealized losses $ 6,470 $ 11,816
US Agency Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 56 58
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 51,185 $ 72,679
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 325 533
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 157,658 144,636
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 1,766 3,500
Available-for-sale securities in a continuous loss position, estimated fair value 208,843 217,315
Available-for-sale securities in a continuous loss position, unrealized losses $ 2,091 $ 4,033
Residential Mortgage Backed Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 140 151
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 22,026 $ 61,199
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 123 527
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 226,380 225,995
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 4,163 6,766
Available-for-sale securities in a continuous loss position, estimated fair value 248,406 287,194
Available-for-sale securities in a continuous loss position, unrealized losses $ 4,286 $ 7,293
Municipal Bonds [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 6 11
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value   $ 4,299
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses   50
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value $ 13,974 17,041
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 80 434
Available-for-sale securities in a continuous loss position, estimated fair value 13,974 21,340
Available-for-sale securities in a continuous loss position, unrealized losses $ 80 $ 484
Corporate Bonds [Member]    
Available-for-sale securities in a continuous loss position, number of securities | Number 1 1
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 1,488 $ 1,494
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 13 6
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value  
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses  
Available-for-sale securities in a continuous loss position, estimated fair value 1,488 1,494
Available-for-sale securities in a continuous loss position, unrealized losses $ 13 $ 6