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Accounting Policies - Changes in Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 51,085 | $ 33,758 | $ (11,019)
Cumulative Effect of New Accounting Principle in Period of Adoption |  | 27 |
Accumulated Other Comprehensive Income, Net of Tax, Adjusted Balance |  | 51,112 |
Other comprehensive (loss)/income before reclassifications | (16,580) | 24,077 | 55,062
Amounts reclassified from AOCI | (9,576) | (15,803) | (10,285)
Net comprehensive (loss)/income | (26,156) | 8,274 | 44,777
Ending Balance | 24,956 | 51,085 | 33,758
Reclass of Stranded Tax Effects from AOCI to Retained Earnings |  | 0 |
Retained Earnings [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net comprehensive (loss)/income | 0 | 0 | 0
Reclass of Stranded Tax Effects from AOCI to Retained Earnings |  | 9,053 |
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Available-for-sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (1,676) | (14,387) | (10,035)
Cumulative Effect of New Accounting Principle in Period of Adoption |  | 0 |
Accumulated Other Comprehensive Income, Net of Tax, Adjusted Balance |  | (1,676) |
Other comprehensive (loss)/income before reclassifications | (19,151) | 23,925 | 5,481
Amounts reclassified from AOCI | (4,533) | (10,917) | (9,833)
Net comprehensive (loss)/income | (23,684) | 13,008 | (4,352)
Ending Balance | (25,360) | (1,676) | (14,387)
Reclass of Stranded Tax Effects from AOCI to Retained Earnings |  | (297) |
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Held-to-maturity Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 48,236 | 45,752 | (476)
Cumulative Effect of New Accounting Principle in Period of Adoption |  | 0 |
Accumulated Other Comprehensive Income, Net of Tax, Adjusted Balance |  | 48,236 |
Other comprehensive (loss)/income before reclassifications | 0 | 0 | 47,993
Amounts reclassified from AOCI | (4,793) | (6,064) | (1,765)
Net comprehensive (loss)/income | (4,793) | (6,064) | 46,228
Ending Balance | 43,443 | 48,236 | 45,752
Reclass of Stranded Tax Effects from AOCI to Retained Earnings |  | 8,548 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 4,525 | 2,393 | (508)
Cumulative Effect of New Accounting Principle in Period of Adoption |  | 27 |
Accumulated Other Comprehensive Income, Net of Tax, Adjusted Balance |  | 4,552 |
Other comprehensive (loss)/income before reclassifications | 2,571 | 152 | 1,588
Amounts reclassified from AOCI | (250) | 1,178 | 1,313
Net comprehensive (loss)/income | 2,321 | 1,330 | 2,901
Ending Balance | 6,873 | 4,525 | 2,393
Reclass of Stranded Tax Effects from AOCI to Retained Earnings |  | 802 |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net comprehensive (loss)/income | (26,156) | 8,274 | 44,777
Reclass of Stranded Tax Effects from AOCI to Retained Earnings |  | (9,053) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Derivative Instruments [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Available-for-sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, Current Period, Tax | 0 | (5,897) | (5,381)
Amounts reclassified from AOCI | 0 | 10,948 | 9,994
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 0 | (16,845) | (15,375)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Investments [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Available-for-sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, Current Period, Tax | 0 | (31) | 3
Amounts reclassified from AOCI | 0 | 58 | (6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ 0 | $ (89) | $ 9

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