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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Available for sale Amortized Cost	$ 1,248,749,000	$ 854,511,000
Available-for-sale Securities	1,239,469,000	841,857,000
Held-to-maturity, Amortized cost		424,740,000
Held to maturity Fair Value	0	410,353,000
Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	5,394,000
Available-for-sale Securities	5,350,000
Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	323,833,000
Available-for-sale Securities	321,318,000
Maturities Due After Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	908,589,000
Available-for-sale Securities	901,942,000
Collateralized Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,234,416,000	840,055,000
Available-for-sale Securities	1,225,225,000	827,565,000
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	947,332,000	561,878,000
Available-for-sale Securities	937,278,000	553,331,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	224,157,000	211,947,000
Available-for-sale Securities	226,558,000	210,170,000
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	62,927,000	66,230,000
Available-for-sale Securities	61,389,000	64,064,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	3,056,000
Available-for-sale Securities	3,054,000
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	3,056,000
Available-for-sale Securities	3,054,000
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	322,771,000
Available-for-sale Securities	320,229,000
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	267,310,000
Available-for-sale Securities	266,195,000
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	94,000
Available-for-sale Securities	98,000
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	55,367,000
Available-for-sale Securities	53,936,000
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	908,589,000
Available-for-sale Securities	901,942,000
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	676,966,000
Available-for-sale Securities	668,029,000
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	224,063,000
Available-for-sale Securities	226,460,000
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	7,560,000
Available-for-sale Securities	7,453,000
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	14,333,000	14,456,000
Available-for-sale Securities	14,244,000	14,292,000
Investment Securities | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	10,933,000	10,924,000
Available-for-sale Securities	10,859,000	10,805,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Obligation of US Government sponsored agencies at loss [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,238,000	2,325,000
Available-for-sale Securities	2,196,000	2,265,000
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,162,000	1,207,000
Available-for-sale Securities	1,189,000	$ 1,222,000
Investment Securities | Maturities Due In Less Than One Year [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	10,933,000
Available-for-sale Securities	10,859,000
Investment Securities | Maturities Due In Less Than One Year [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	10,933,000
Available-for-sale Securities	10,859,000
Investment Securities | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,338,000
Available-for-sale Securities	2,296,000
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	2,238,000
Available-for-sale Securities	2,196,000
Investment Securities | Maturities Due From One To Five Years [Member] | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	100,000
Available-for-sale Securities	100,000
Investment Securities | Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,062,000
Available-for-sale Securities	1,089,000
Investment Securities | Maturities Due From Five To Ten Years [Member] | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,062,000
Available-for-sale Securities	$ 1,089,000

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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