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Investment Securities, Available-for-sale Securities, Gross Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value $ 0 $ 140,557
12 months or more - Fair Value 9,233 243,825
Total - Fair Value 9,233 384,382
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 0 1,201
12 months or more - Gross Unrealized Loss 165 1,219
Total - Gross Unrealized Loss 165 2,420
U. S. Government Sponsored Enterprises [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value   19,820
12 months or more - Fair Value   74,656
Total - Fair Value   94,476
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss   180
12 months or more - Gross Unrealized Loss   239
Total - Gross Unrealized Loss   419
Mortgage-Backed Securities and Collateralized Mortgage Obligations - Residential [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value 0 67,322
12 months or more - Fair Value 4,390 169,169
Total - Fair Value 4,390 236,491
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 0 446
12 months or more - Gross Unrealized Loss 7 980
Total - Gross Unrealized Loss 7 1,426
Corporate Bonds [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value 0 4,905
12 months or more - Fair Value 4,843 0
Total - Fair Value 4,843 4,905
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 0 95
12 months or more - Gross Unrealized Loss 158 0
Total - Gross Unrealized Loss $ 158 95
Small Business Administration-Guaranteed Participation Securities [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value   48,510
12 months or more - Fair Value   0
Total - Fair Value   48,510
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss   480
12 months or more - Gross Unrealized Loss   0
Total - Gross Unrealized Loss   $ 480