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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 172,595 | $ 96,787 | $ 88,526
Other comprehensive income (loss), net of tax: |  |  |
Unrealized gain (loss) on debt securities arising during the period | (11,229) | 4,367 | 384
Change in retirement obligation | (8,180) | 3,172 | 1,245
Unrealized gain (loss) on derivatives | 484 | 514 | 508
Other comprehensive income (loss) | (18,925) | 8,053 | 2,137
Comprehensive income | $ 153,670 | $ 104,840 | $ 90,663

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