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Investment Securities (Investment Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Available for sale Amortized Cost	$ 432,176	$ 1,074,475
Available-for-sale Securities	446,438	1,074,169
Collateralized Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	418,976	674,217
Available-for-sale Securities	432,935	673,886
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	206,195	403,227
Available-for-sale Securities	210,949	402,656
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	174,472	215,755
Available-for-sale Securities	182,772	216,469
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	38,309	55,235
Available-for-sale Securities	39,214	54,761
Collateralized Mortgage Backed Securities [Member] | Maturities Due In Less Than One Year [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	348
Available-for-sale Securities	364
Collateralized Mortgage Backed Securities [Member] | Maturities Due In Less Than One Year [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	348
Available-for-sale Securities	364
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	469
Available-for-sale Securities	472
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	469
Available-for-sale Securities	472
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	187,737
Available-for-sale Securities	193,737
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	96,902
Available-for-sale Securities	100,643
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	58,615
Available-for-sale Securities	60,081
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	32,220
Available-for-sale Securities	33,013
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	230,422
Available-for-sale Securities	238,362
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	108,945
Available-for-sale Securities	109,942
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	115,388
Available-for-sale Securities	122,219
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	6,089
Available-for-sale Securities	6,201
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	13,200	400,258
Available-for-sale Securities	13,503	400,283
Investment Securities | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	10,740	397,183
Available-for-sale Securities	10,983	397,183
Investment Securities | Obligation of US Government Sponsored Agencies [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,585	1,967
Available-for-sale Securities	1,606	1,961
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	875	1,108
Available-for-sale Securities	914	$ 1,139
Investment Securities | Maturities Due In Less Than One Year [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	986
Available-for-sale Securities	986
Investment Securities | Maturities Due In Less Than One Year [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	735
Available-for-sale Securities	735
Investment Securities | Maturities Due In Less Than One Year [Member] | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	251
Available-for-sale Securities	251
Investment Securities | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	11,590
Available-for-sale Securities	11,854
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	10,005
Available-for-sale Securities	10,248
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	1,585
Available-for-sale Securities	1,606
Investment Securities | Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	624
Available-for-sale Securities	663
Investment Securities | Maturities Due From Five To Ten Years [Member] | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	624
Available-for-sale Securities	$ 663

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