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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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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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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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