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Securities Available for Sale (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | $ 1,893,618 | $ 1,751,879 |  |
Gross Unrealized Gains | 3,010 | 1,466 |  |
Gross Unrealized Losses | (50,363) | (33,088) |  |
Estimated Fair Value | 1,846,265 | 1,720,257 |  |
Amount of other than temporary impairment loss recognized | 0 |  |  |
Unrealized losses on securities | 32,705 | 21,781 |  |
Reclassifications out of accumulated other comprehensive loss | 0 | 301 | $ 950 |
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01 |  |  |  | $ (188)
Collateralized Mortgage Obligations |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 914,710 | 856,193 |  |
Gross Unrealized Gains | 1,541 | 58 |  |
Gross Unrealized Losses | (21,129) | (17,542) |  |
Estimated Fair Value | 895,122 | 838,709 |  |
Mortgage-backed Securities, Residential |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 415,659 | 477,676 |  |
Gross Unrealized Gains | 47 | 521 |  |
Gross Unrealized Losses | (13,101) | (6,983) |  |
Estimated Fair Value | 402,605 | 471,214 |  |
Mortgage-backed Securities, Commercial |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 481,081 | 308,046 |  |
Gross Unrealized Gains | 1,024 | 0 |  |
Gross Unrealized Losses | (12,979) | (6,681) |  |
Estimated Fair Value | 469,126 | 301,365 |  |
Corporate securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 5,000 | 4,997 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | (1,174) | (522) |  |
Estimated Fair Value | 3,826 | 4,475 |  |
Municipal securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 77,168 | 82,542 |  |
Gross Unrealized Gains | 398 | 870 |  |
Gross Unrealized Losses | (1,980) | (875) |  |
Estimated Fair Value | $ 75,586 | 82,537 |  |
Total debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 1,729,454 |  |
Gross Unrealized Gains |  | 1,449 |  |
Gross Unrealized Losses |  | (32,603) |  |
Estimated Fair Value |  | 1,698,300 |  |
Mutual funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 22,425 |  |
Gross Unrealized Gains |  | 17 |  |
Gross Unrealized Losses |  | (485) |  |
Estimated Fair Value |  | 21,957 |  |
Credit concentration risk | Stockholders' equity | Non-US government and agency securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Maximum exposure to any single issuer | 10.00% |  |  |
Available-for-sale Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Unrealized losses on securities | $ 32,700 | $ 21,800 |  |
Retained Earnings |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01 | (469) |  |  | $ (469)
Retained Earnings | Accounting Standards Update 2016-01 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01 | $ 469 |  |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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