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Investment Securities (Investment Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Available for sale Amortized Cost	$ 529,985	$ 1,074,475
Available-for-sale Securities	540,239	1,074,169
Collateralized Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	330,987	674,217
Available-for-sale Securities	340,194	673,886
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	145,405	403,227
Available-for-sale Securities	149,817	402,656
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	138,084	215,755
Available-for-sale Securities	141,765	216,469
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	47,498	55,235
Available-for-sale Securities	48,612	54,761
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,527
Available-for-sale Securities	1,575
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	905
Available-for-sale Securities	947
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	622
Available-for-sale Securities	628
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	213,520
Available-for-sale Securities	219,244
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	108,476
Available-for-sale Securities	112,013
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	65,902
Available-for-sale Securities	67,185
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	39,142
Available-for-sale Securities	40,046
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	115,940
Available-for-sale Securities	119,375
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	36,024
Available-for-sale Securities	36,857
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	71,560
Available-for-sale Securities	73,952
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	8,356
Available-for-sale Securities	8,566
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	198,998	400,258
Available-for-sale Securities	200,045	400,283
Investment Securities | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	196,358	397,183
Available-for-sale Securities	197,340	397,183
Investment Securities | Obligation of US Government Sponsored Agencies [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,796	1,967
Available-for-sale Securities	1,824	1,961
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	844	1,108
Available-for-sale Securities	881	$ 1,139
Investment Securities | Maturities Due In Less Than One Year [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	186,451
Available-for-sale Securities	187,126
Investment Securities | Maturities Due In Less Than One Year [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	186,351
Available-for-sale Securities	187,026
Investment Securities | Maturities Due In Less Than One Year [Member] | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	100
Available-for-sale Securities	100
Investment Securities | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	11,803
Available-for-sale Securities	12,138
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	10,007
Available-for-sale Securities	10,314
Investment Securities | Maturities Due From One To Five Years [Member] | Obligation of US Government Sponsored Agencies [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,796
Available-for-sale Securities	1,824
Investment Securities | Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	744
Available-for-sale Securities	781
Investment Securities | Maturities Due From Five To Ten Years [Member] | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	744
Available-for-sale Securities	$ 781

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