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Investment Securities (Contractual Maturities and Estimated Fair Values) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Held-to-maturity debt securities amortized cost disclosures |  |  |
Due after one year through five years, held-to-maturity debt securities amortized cost | $ 1,200,000 |  |
Amortized cost, held-to-maturity debt securities | 1,200,000 | $ 2,400,000 |
Held-to-maturity debt securities, Estimated fair value disclosures |  |  |
Due after one year through five years, held-to-maturity debt securities, Estimated fair value | 1,200,000 |  |
Estimated fair value | 1,200,000 | 2,400,000 |
Available-for-sale debt securities amortized cost disclosures |  |  |
Due after five years through ten years, available-for-sale debt securities amortized cost | 500,000 |  |
Due after ten years, available-for-sale debt securities amortized cost | 185,299,000 |  |
Residential mortgage-backed securities, amortized cost | 3,295,366,000 |  |
Amortized cost, Available-for-sale securities | 3,481,165,000 | 4,196,263,000 |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value | 502,000 |  |
Due after ten years, available-for-sale debt securities, Estimated Fair Value | 187,838,000 |  |
Residential mortgage-backed securities, Estimated Fair Value | 3,223,010,000 |  |
Estimated fair value, Available for sale securities | 3,411,350,000 | 4,124,184,000 |
Proceeds from sales and calls of available for sale securities | 38,175,000 | 396,066,000 | $ 352,743,000
Proceeds from sales of mortgage-backed securities | 0 | 377,756,000 | 338,138,000
Gross gains realized on sales | 3,000 | 1,186,000 | 586,000
Gross losses realized on sales | 144,000 | $ 5,960,000 | $ 3,212,000
Collateral Pledged |  |  |
Available-for-sale debt securities amortized cost disclosures |  |  |
Amortized cost, Available-for-sale securities | 1,112,852,000 |  |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |
Fair value of available for sale investment securities pledged | $ 1,086,360,000 |  |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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