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Investment Securities, Available-for-sale Securities, Gross Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value $ 45,915 $ 77,814
12 months or more - Fair Value 438,490 481,405
Total - Fair Value 484,405 559,219
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 215 637
12 months or more - Gross Unrealized Loss 13,911 8,224
Total - Gross Unrealized Loss 14,126 8,861
U. S. Government Sponsored Enterprises [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value 29,870 29,734
12 months or more - Fair Value 112,291 98,090
Total - Fair Value 142,161 127,824
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 106 266
12 months or more - Gross Unrealized Loss 2,602 1,800
Total - Gross Unrealized Loss 2,708 2,066
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 1,102 48,080
12 months or more - Fair Value 259,729 266,394
Total - Fair Value 260,831 314,474
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 11 371
12 months or more - Gross Unrealized Loss 9,396 4,344
Total - Gross Unrealized Loss 9,407 4,715
Corporate Bonds [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value 14,943 0
12 months or more - Fair Value 9,995 40,162
Total - Fair Value 24,938 40,162
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 98 0
12 months or more - Gross Unrealized Loss 12 108
Total - Gross Unrealized Loss 110 108
Small Business Administration-Guaranteed Participation Securities [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value 0 0
12 months or more - Fair Value 56,475 67,059
Total - Fair Value 56,475 67,059
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 0 0
12 months or more - Gross Unrealized Loss 1,901 1,862
Total - Gross Unrealized Loss $ 1,901 1,862
Mortgage-Backed Securities and Collateralized Mortgage Obligations - Commercial [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value   0
12 months or more - Fair Value   9,700
Total - Fair Value   9,700
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss   0
12 months or more - Gross Unrealized Loss   110
Total - Gross Unrealized Loss   $ 110