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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% |  |
Available-for-sale Securities, Gross Realized Losses |  | $ 625,000 | $ 2,600,000 |
Debt securities held-to-maturity, at amortized cost (fair value of $364,560 and $351,422 at June 30, 2019 and December 31, 2018, respectively) | $ 350,375,000 | 350,375,000 |  | $ 351,808,000
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss) |  |  | $ 291,000 |
percent of held to securities sold paid down |  |  | 96.30% |
Other than Temporary Impairment Losses, Investments | 0 | 0 | $ 0 |
Available-for-sale Securities, Gross Realized Gains |  | $ 18,000 | 60,000 |
Asset backed securities mortgage portfolio, term |  | 15 years |  |
Debt Securities, Available-for-sale, Amortized Cost | 973,923,000 | $ 973,923,000 |  | 1,028,883,000
Securities sold at a gain [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 51,700,000 | 51,700,000 | 245,000,000.0 |
Securities sold at a gain [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Debt securities held-to-maturity, at amortized cost (fair value of $364,560 and $351,422 at June 30, 2019 and December 31, 2018, respectively) |  |  | 7,400,000 |
Debt Securities, Available-for-sale, Amortized Cost | 5,300,000 | 5,300,000 | $ 2,000,000.0 |
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Debt securities held-to-maturity, at amortized cost (fair value of $364,560 and $351,422 at June 30, 2019 and December 31, 2018, respectively) | 46,264,000 | 46,264,000 |  | 46,530,000
Debt Securities, Available-for-sale, Amortized Cost | 948,287,000 | 948,287,000 |  | 1,028,883,000
Collateral Pledged [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Restricted | $ 587,000,000 | $ 587,000,000 |  | $ 634,000,000

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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=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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