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Investment Securities (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2019 | Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Money market investments | $ 7,485 | $ 6,991 | $ 7,485 | $ 6,991 |  | $ 4,930
Transfer from held-to-maturity securities to available-for-sale securities |  |  | 424,740 | 0 |  |
Accumulated other comprehensive income, net of tax | (3,686) |  | (3,686) |  |  | (10,963)
Securitized GNMA pools retained, amortized cost | $ 25,700 | $ 37,600 | $ 25,700 | $ 37,600 |  |
Securitized GNMA pool retained, yield | 3.69% | 3.45% | 3.69% | 3.45% |  |
Investments guaranteed by US treasury and sponsored agencies in unrealized loss on position | $ 556,500 |  | $ 556,500 |  |  |
Gain on sales of mortgaged-backed securities | 4,800 |  |  |  |  |
Held-to-maturity, Amortized cost |  |  |  |  |  | $ 424,740
Carrying value of securities sold | $ 349,700 | $ 0 | 349,726 | $ 0 |  |
Accounting Standards Update 201712 [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income, net of tax |  |  |  |  | $ 14,400 |
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Carrying value of securities sold |  |  | 211,549 |  |  |
Collateralized Mortgage Backed Securities [Member] | Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Carrying value of securities sold |  |  | $ 138,177 |  |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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