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Investment Securities, Available-for-sale Securities, Gross Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value $ 81,640 $ 77,814
12 months or more - Fair Value 419,061 481,405
Total - Fair Value 500,701 559,219
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 1,722 637
12 months or more - Gross Unrealized Loss 19,981 8,224
Total - Gross Unrealized Loss 21,703 8,861
U. S. Government Sponsored Enterprises [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value 58,593 29,734
12 months or more - Fair Value 91,460 98,090
Total - Fair Value 150,053 127,824
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 1,381 266
12 months or more - Gross Unrealized Loss 3,432 1,800
Total - Gross Unrealized Loss 4,813 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 8,061 48,080
12 months or more - Fair Value 259,715 266,394
Total - Fair Value 267,776 314,474
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 266 371
12 months or more - Gross Unrealized Loss 12,974 4,344
Total - Gross Unrealized Loss 13,240 4,715
Corporate Bonds [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value 14,986 0
12 months or more - Fair Value 9,992 40,162
Total - Fair Value 24,978 40,162
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 75 0
12 months or more - Gross Unrealized Loss 38 108
Total - Gross Unrealized Loss 113 108
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 57,894 67,059
Total - Fair Value 57,894 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 3,537 1,862
Total - Gross Unrealized Loss $ 3,537 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