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Investment Securities (Unrealized Gains and Losses by Category) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract]
Available for sale - Amortized cost - less than 12 month	$ 39,732	$ 20,598
Available for sale - Amortized cost - more than 12 month	0	296,502
Total Available for Sale Amortization cost	39,732	317,100
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale - Unrealized Loss - less than 12 month	210	109
Available for sale - Unrealized Loss - more than 12 month	0	1,808
Total Available for Sale Unrealized Loss	210	1,917
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Available for sale - Fair Value - less than 12 month	39,522	20,489
Available-for-sale, Fair Value - more than 12 month	0	294,694
Total Available for Sale Fair Value	39,522	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	0	11,503
Available for sale - Amortized cost - more than 12 month	0	35,417
Total Available for Sale Amortization cost	0	46,920
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale - Unrealized Loss - less than 12 month	0	103
Available for sale - Unrealized Loss - more than 12 month	0	387
Total Available for Sale Unrealized Loss	0	490
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Available for sale - Fair Value - less than 12 month	0	11,400
Available-for-sale, Fair Value - more than 12 month	0	35,030
Total Available for Sale Fair Value	0	46,430
Obligation of Puerto Rico Government and public instrumentalities at loss
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract]
Available for sale - Amortized cost - more than 12 month	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale - Unrealized Loss - more than 12 month	0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Available-for-sale, Fair Value - more than 12 month	0
FNMA and FHLMC [Member]
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract]
Available for sale - Amortized cost - less than 12 month	34,628	4,919
Available for sale - Amortized cost - more than 12 month	0	259,099
Total Available for Sale Amortization cost	34,628	264,018
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale - Unrealized Loss - less than 12 month	32	2
Available for sale - Unrealized Loss - more than 12 month	0	1,415
Total Available for Sale Unrealized Loss	32	1,417
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Available for sale - Fair Value - less than 12 month	34,596	4,917
Available-for-sale, Fair Value - more than 12 month	0	257,684
Total Available for Sale Fair Value	34,596	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	5,104	3,549
Available for sale - Amortized cost - more than 12 month	0	19
Total Available for Sale Amortization cost	5,104	3,568
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale - Unrealized Loss - less than 12 month	178	4
Available for sale - Unrealized Loss - more than 12 month	0	0
Total Available for Sale Unrealized Loss	178	4
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Available for sale - Fair Value - less than 12 month	4,926	3,545
Available-for-sale, Fair Value - more than 12 month	0	19
Total Available for Sale Fair Value	4,926	3,564
Obligation of US Government Sponsored Agencies [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	0	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	0	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	0	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	0	627
Available for sale - Amortized cost - more than 12 month	0
Total Available for Sale Amortization cost	0	627
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale - Unrealized Loss - less than 12 month	0	0
Available for sale - Unrealized Loss - more than 12 month	0
Total Available for Sale Unrealized Loss	0	0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Available for sale - Fair Value - less than 12 month	0	627
Available-for-sale, Fair Value - more than 12 month	0
Total Available for Sale Fair Value	$ 0	$ 627

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