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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Available for sale Amortized Cost	$ 1,074,475	$ 854,511
Available-for-sale Securities	1,074,169	841,857
Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	24,393
Available-for-sale Securities	24,416
Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	238,937
Available-for-sale Securities	238,484
Collateralized Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	674,217	840,055
Available-for-sale Securities	673,886	827,565
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	403,227	561,878
Available-for-sale Securities	402,656	553,331
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	215,755	211,947
Available-for-sale Securities	216,469	210,170
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	55,235	66,230
Available-for-sale Securities	54,761	64,064
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,396
Available-for-sale Securities	2,425
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	1,611
Available-for-sale Securities	1,640
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	785
Available-for-sale Securities	785
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	238,079
Available-for-sale Securities	237,595
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	111,923
Available-for-sale Securities	111,916
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	80,675
Available-for-sale Securities	80,676
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	45,481
Available-for-sale Securities	45,003
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	433,742
Available-for-sale Securities	433,866
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	289,693
Available-for-sale Securities	289,100
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	134,295
Available-for-sale Securities	135,008
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	9,754
Available-for-sale Securities	9,758
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	400,258	14,456
Available-for-sale Securities	400,283	14,292
Investment Securities | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	397,183	10,924
Available-for-sale Securities	397,183	10,805
Investment Securities | Obligation of US Government sponsored agencies at loss [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,967	2,325
Available-for-sale Securities	1,961	2,265
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,108	1,207
Available-for-sale Securities	1,139	$ 1,222
Investment Securities | Maturities Due In Less Than One Year [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	377,403
Available-for-sale Securities	377,403
Investment Securities | Maturities Due In Less Than One Year [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	377,153
Available-for-sale Securities	377,153
Investment Securities | Maturities Due In Less Than One Year [Member] | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	250
Available-for-sale Securities	250
Investment Securities | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	21,997
Available-for-sale Securities	21,991
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	20,030
Available-for-sale Securities	20,030
Investment Securities | Maturities Due From One To Five Years [Member] | Obligation of US Government sponsored agencies at loss [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,967
Available-for-sale Securities	1,961
Investment Securities | Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	858
Available-for-sale Securities	889
Investment Securities | Maturities Due From Five To Ten Years [Member] | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	858
Available-for-sale Securities	$ 889

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