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Investment Securities, Available-for-sale Securities, Gross Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value $ 136,517 $ 45,915
12 months or more - Fair Value 267,255 438,490
Total - Fair Value 403,772 484,405
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 858 215
12 months or more - Gross Unrealized Loss 2,224 13,911
Total - Gross Unrealized Loss 3,082 14,126
U. S. Government Sponsored Enterprises [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value 39,915 29,870
12 months or more - Fair Value 74,522 112,291
Total - Fair Value 114,437 142,161
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 85 106
12 months or more - Gross Unrealized Loss 372 2,602
Total - Gross Unrealized Loss 457 2,708
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 53,449 1,102
12 months or more - Fair Value 192,733 259,729
Total - Fair Value 246,182 260,831
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 360 11
12 months or more - Gross Unrealized Loss 1,852 9,396
Total - Gross Unrealized Loss 2,212 9,407
Corporate Bonds [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value 14,723 14,943
12 months or more - Fair Value 0 9,995
Total - Fair Value 14,723 24,938
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 277 98
12 months or more - Gross Unrealized Loss 0 12
Total - Gross Unrealized Loss 277 110
Small Business Administration-Guaranteed Participation Securities [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value 27,832 0
12 months or more - Fair Value 0 56,475
Total - Fair Value 27,832 56,475
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 134 0
12 months or more - Gross Unrealized Loss 0 1,901
Total - Gross Unrealized Loss 134 $ 1,901
Other [Member]    
Available for sale securities unrealized loss position - Fair Value [Abstract]    
Less than 12 months - Fair Value 598  
12 months or more - Fair Value 0  
Total - Fair Value 598  
Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]    
Less than 12 months - Gross Unrealized Loss 2  
12 months or more - Gross Unrealized Loss 0  
Total - Gross Unrealized Loss $ 2