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Investment Securities (Unrealized Gains and Losses by Category) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract]
Available for sale - Amortized cost - less than 12 month	$ 20,598
Available for sale - Amortized cost - more than 12 month	296,502
Total Available for Sale Amortization cost	317,100
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale - Unrealized Loss - less than 12 month	109
Available for sale - Unrealized Loss - more than 12 month	1,808
Total Available for Sale Unrealized Loss	1,917
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Available for sale - Fair Value - less than 12 month	20,489
Available-for-sale, Fair Value - more than 12 month	294,694
Total Available for Sale Fair Value	315,183
CMO's issued by us government sponsored agencies at loss
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract]
Available for sale - Amortized cost - less than 12 month	11,503
Available for sale - Amortized cost - more than 12 month	35,417
Total Available for Sale Amortization cost	46,920
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale - Unrealized Loss - less than 12 month	103
Available for sale - Unrealized Loss - more than 12 month	387
Total Available for Sale Unrealized Loss	490
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Available for sale - Fair Value - less than 12 month	11,400
Available-for-sale, Fair Value - more than 12 month	35,030
Total Available for Sale Fair Value	46,430
FNMA and FHLMC [Member]
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract]
Available for sale - Amortized cost - less than 12 month	4,919
Available for sale - Amortized cost - more than 12 month	259,099
Total Available for Sale Amortization cost	264,018
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale - Unrealized Loss - less than 12 month	2
Available for sale - Unrealized Loss - more than 12 month	1,415
Total Available for Sale Unrealized Loss	1,417
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Available for sale - Fair Value - less than 12 month	4,917
Available-for-sale, Fair Value - more than 12 month	257,684
Total Available for Sale Fair Value	262,601
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract]
Available for sale - Amortized cost - less than 12 month	3,549
Available for sale - Amortized cost - more than 12 month	19
Total Available for Sale Amortization cost	3,568
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale - Unrealized Loss - less than 12 month	4
Available for sale - Unrealized Loss - more than 12 month	0
Total Available for Sale Unrealized Loss	4
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Available for sale - Fair Value - less than 12 month	3,545
Available-for-sale, Fair Value - more than 12 month	19
Total Available for Sale Fair Value	3,564
Obligation of US Government sponsored agencies at loss [Member]
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract]
Available for sale - Amortized cost - more than 12 month	1,967
Total Available for Sale Amortization cost	1,967
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale - Unrealized Loss - more than 12 month	6
Total Available for Sale Unrealized Loss	6
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Available-for-sale, Fair Value - more than 12 month	1,961
Total Available for Sale Fair Value	1,961
US Treasury Securities at loss
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract]
Available for sale - Amortized cost - less than 12 month	627
Total Available for Sale Amortization cost	627
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale - Unrealized Loss - less than 12 month	0
Total Available for Sale Unrealized Loss	0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Available for sale - Fair Value - less than 12 month	627
Total Available for Sale Fair Value	$ 627

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Amortized cost of investments in available-for-sale securities that have been in a loss position.

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