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Investment Securities (Gross realize gains and losses by category) (Details) - Collateralized Mortgage Backed Securities [Member] - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |
Sale Price | $ 295,172 | $ 67,075
Book Value | 283,176 | 64,503
Available-for-sale Securities, Gross Realized Gains | 16,113 | 2,572
Available-for-sale Securities, Gross Realized Losses | 4,117 | 0
FNMA and FHLMC [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Sale Price | 288,194 | 40,307
Book Value | 272,081 | 37,735
Available-for-sale Securities, Gross Realized Gains | 16,113 | 2,572
Available-for-sale Securities, Gross Realized Losses | 0 | 0
GNMA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Sale Price | 6,978 | 26,768
Book Value | 11,095 | 26,768
Available-for-sale Securities, Gross Realized Gains | 0 | 0
Available-for-sale Securities, Gross Realized Losses | $ 4,117 | $ 0

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- Definition This item represents the book value at the sale 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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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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